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Journey on the Tongue is a totally new taste and sound installation which invites you on a spectacular multi-sensory journey. Realized by the three artists Ayako Suwa, the pursuer of “Expressive food,” sound artist Evala, the founder of “See by Your Ears,” and media artist Yasuaki Kakehi, who explores new haptic experiences. This work is a new perception of sound and taste.
In your mouth, on your tongue, you will taste a sound experience of the journey to the various destinations. When you wear earplugs to cancel extraneous sounds and put a candy “Taste of Journey” in your mouth, the journey starts with sounds vibration. Then you can hear the sounds clearly inside your body. Though you close your eyes and ears, the experience evokes various dreamscapes via the multiple sensations of sound, touch, and flavor. Everything synthesizes in the mouth to provide a sense of time passing and spatial movement.
Credit: Jürgen Grünwald
Sold in pill form under the name Iridium, branded as Bongbastic - Bong Cleaning Products, Europe, circa 2012.
Notes: 2C-D (2C-M) is a psychedelic drug of the 2C family that is sometimes used as an entheogen. It was first synthesized in 1970 by a team from the Texas Research Institute of Mental Sciences,[1] and its activity was subsequently investigated in humans by Alexander Shulgin. The full name of the chemical is 2,5-dimethoxy-4-methylphenethylamine. In his book PiHKAL (Phenethylamines i Have Known And Loved), Shulgin lists the dosage range as being from 20 to 60 mg and many people recommend higher doses. Lower doses (generally 10 mg or less) of 2C-D have been explored as a potential nootropic, albeit with mixed results. 2C-D is generally taken orally, though may be insufflated (i.e. taken nasally). Insufflating tends to cause intense pain, however, and the dosage level is usually much lower, typically in the region of 1 to 15 mg.
Western Arabia Terra imaged by the Mars Express HRSC instrument. This image captures the transition from the rugged equatorial highland terrain of Arabia Terra as it transitions into the relatively featureless northern lowland region of Acidalia Planitia. Although this region is among the oldest locations on the Martian surface, the geology is unspectacular, consisting of generally unmodified craters, few tectonic features, and relatively few channels carved by water. In the absence of attention from geologists, very few of the craters in this region have been named.
This image was captured in the middle of Martian summer, when Mars is near its furthest from the Sun. During this period, the Martian atmosphere cools substantially, allowing daytime water ice clouds to form at equatorial latitudes across the entire planet for a few months. This phenomenon, called the Aphelion Cloud Belt, was active in this photo, although the clouds associated with it were beginning to thin for the season when this image was taken.
This image was created using two limb-scan images taken through Mars Express' blue and green filters. These sequences are designed to study Martian atmospheric layers. These sequences require a complex geometric correction to resemble what a human eye might see. In addition, a red channel has been synthesized by subtracting blue channel data from the green channel data.
This image was taken during Mars Express' 15569th orbit of the red planet, April 13, 2016.
Image Credit: ESA/DLR/FU Berlin/J. Cowart, CC BY-SA 3.0 IGO
PLEASE, no multi invitations, glitters or self promotion in your comments. My photos are FREE for anyone to use, just give me credit and it would be nice if you let me know. Thanks
No pictures are allowed in the Sistine Chapel, they just appear in the camera..... (I have to upload 3 sets)
One of the most famous places in the world, the Sistine Chapel is the site where the conclave for the election of the popes and other solemn pontifical ceremonies are held. Built between 1475 and 1481, the chapel takes its name from Pope Sixtus IV, who commissioned it.
The frescoes on the long walls illustrate parallel events in the Lives of Moses and Christ and constitute a complex of extraordinary interest executed between 1481 and 1483 by Perugino, Botticelli, Cosimo Rosselli and Domenico Ghirlandaio, with their respective groups of assistants, who included Pinturicchio, Piero di Cosimo and others; later Luca Signorelli also joined the group.
The barrel-vaulted ceiling is entirely covered by the famous frescoes which Michelangelo painted between 1508 and 1512 for Julius II. The original design was only to have represented the Apostles, but was modified at the artist's insistence to encompass an enormously complex iconographic theme which may be synthesized as the representation of mankind waiting for the coming of the Messiah. More than twenty years later, Michelangelo was summoned back by Paul III (1534-49) to paint the Last Judgement on the wall behind the altar. He worked on it from 1536 to 1541.
Beryllium ( /bəˈrɪliəm/ bə-ril-ee-əm) is the chemical element with the symbol Be and atomic number 4. It is a divalent element which occurs naturally only in combination with other elements in minerals. Notable gemstones which contain beryllium include beryl (aquamarine, emerald) and chrysoberyl. As a free element it is a steel-gray, strong, lightweight and brittle alkaline earth metal.
Beryllium is used primarily as a hardening agent in alloys, notably beryllium copper. In structural applications, high flexural rigidity, thermal stability, thermal conductivity and low density (1.85 times that of water) make beryllium a quality aerospace material for high-speed aircraft, missiles, space vehicles and communication satellites. Because of its low density and atomic mass, beryllium is relatively transparent to X-rays and other forms of ionizing radiation; therefore, it is the most common window material for X-ray equipment and in particle physics experiments. The high thermal conductivities of beryllium and beryllium oxide have led to their use in heat transport and heat sinking applications.
The commercial use of beryllium metal presents technical challenges due to the toxicity (especially by inhalation) of beryllium-containing dusts. Beryllium is corrosive to tissue, and can cause a chronic life-threatening allergic disease called berylliosis in some people. Because any beryllium synthesized in stars is short-lived, it is a relatively rare element in both the Earth and the universe. The element is not known to be necessary or useful for either plant or animal life.
IndiPix Gallery presents:
Serendipity:
Fortunate discoveries while persistently scouring
the urban landscape for the uniquely unseen.
an Art Photography Exhibition
by Sanjay Nanda.
at the IndiPix Gallery
18 Feb - 17 Mar 2011
10:00 am to 7:00 pm
~
Sanjay Nanda is a graphic designer by profession and passionate about photography. Photography helps him release his intense creative urges and to communicate what he feels and sees. His experience as a visual designer helps him see beauty in mundane things. In his images he likes to use the interplay of light, textures, and colours to create unusual and complex forms that seduce the viewer. He has the ability to extract beauty out of ordinary surroundings and convert them into visually appealing images and at the same time using concepts and techniques that are grounded in the domain of fine art. His select works are part of various private collections.
"Serendipity is a propensity for making fortunate discoveries while looking for something unrelated." This photographic collection is the result of persistent scouring of the urban landscape for the uniquely unseen; compelling moments of light, texture and form; and, often times, decaying elements in the constructed environment. His works are attempts to extract and synthesize the less seen, yet strangely elegant, fragments of the urban landscape in order to reconstruct an urban aesthetic.
IndiPix Gallery
B2/1 Vasant Vihar, New Delhi 110 057
# 96543 76151 / 98102 31011
Route map of IndiPix Gallery:
Opening scene
It is late in the 22nd Century. United Planet cruiser C57D a year out from Earth base on the way to Altair for a special mission. Commander J.J Adams (Leslie Neilsen) orders the crew to the deceleration booths as the ship drops from light speed to normal space.
Adams orders pilot Jerry Farman (Jack Kelly) to lay in a course for the fourth planet. The captain then briefs the crew that they are at their destination, and that they are to look for survivors from the Bellerophon expedition 20 years earlier.
As they orbit the planet looking for signs of life, the ship is scanned by a radar facility some 20 square miles in area. Morbius (Walter Pigeon) contacts the ship from the planet asking why the ship is here. Morbius goes on to explain he requires nothing, no rescue is required and he can't guarantee the safety of the ship or its crew.
Adams confirms that Morbius was a member of the original crew, but is puzzled at the cryptic warning Morbius realizes the ship is going to land regardless, and gives the pilot coordinates in a desert region of the planet. The ship lands and security details deploy. Within minutes a high speed dust cloud approaches the ship. Adams realizes it is a vehicle, and as it arrives the driver is discovered to be a robot (Robby). Robby welcomes the crew to Altair 4 and invites members of the crew to Morbious residence.
Adams, Farman and Doc Ostrow (Warren Stevens) arrive at the residence and are greeted by Morbius. They sit down to a meal prepared by Robbys food synthesizer and Morbius shows the visitors Robbys other abilities, including his unwavering obedience. Morbius then gives Robby a blaster with orders to shoot Adams. Robby refuses and goes into a mechanical mind lock, disabling him till the order is changed.
Morbius then shows the men the defense system of the house (A series of steel shutters). When questioned, Morbius admits that the Belleraphon crew is dead, Morbius and his wife being the only original survivors. Morbius's wife has also died, but months after the others and from natural causes. Morbius goes on to explain many of the crew were torn limb from limb by a strange creature or force living on the planet. The Belleraphon herself was destroyed when the final three surviving members tried to take off for Earth.
Adams wonders why this force has remained dormant all these years and never attacked Morbius. As discussions continue, a young woman Altaira (Anne Francis) introduces herself as Morbius daughter. Farman takes an immediate interest in Altaira, and begins to flirt with her . Altaira then shows the men her ability to control wild animals by petting a wild tiger. During this display the ship checks in on the safety of the away party. Adams explains he will need to check in with Earth for further orders and begins preparations for sending a signal. Because of the power needed the ship will be disabled for up to 10 days. Morbius is mortified by this extended period and offers Robby's services in building the communication facility
The next day Robby arrives at ship as the crew unloads the engine to power the transmitter. To lighten the tense moment the commander instructs the crane driver to pick up Cookie (Earl Holliman) and move him out of the way. Quinn interrupts the practical joke to report that the assembly is complete and they can transmit in the morning.
Meanwhile Cookie goes looking for Robby and organizes for the robot to synthesize some bourbon. Robby takes a sample and tells Cookie he can have 60 gallons ready the next morning for him.
Farman continues to court Altair by teaching her how to kiss, and the health benefits of kissing. Adams interrupts the exercise, and is clearly annoyed with a mix of jealous. He then explains to Altair that the clothes she wears are inappropriate around his crew. Altair tries to argue till Adams looses patience and order Altair to leave the area.
That night, Altair, still furious, explains to her father what occurred. Altair takes Adams advice to heart and orders Robby to run up a less revealing dress. Meanwhile back at the ship two security guards think they hear breathing in the darkness but see nothing.
Inside the ship, one of the crew half asleep sees the inner hatch opened and some material moved around. Next morning the Captain holds court on the events of the night before. Quinn advises the captain that most of the missing and damaged equipment can be replaced except for the Clystron monitor. Angry the Capt and Doc go back to Morbius to confront him about what has occurred.
Morbius is unavailable, so the two men settle in to wait. Outside Adams sees Altair swimming and goes to speak to her. Thinking she is naked, Adams becomes flustered and unsettled till he realizes she wants him to see her new dress. Altair asks why Adams wont kiss her like everyone else has. He gives in and plants one on her. Behind them a tiger emerges from the forest and attacks Altair, Adams reacts by shooting it. Altair is badly troubled by the incident, the tiger had been her friend, but she can't understand why acted as if she was an enemy.
Returning to the house, Doc and Adams accidently open Morbius office. They find a series of strange drawings but no sign of Morbius. He appears through a secret door and is outraged at the intrusion. Adams explains the damage done to the ship the previous night and his concern that Morbius was behind the attack.
Morbius admits it is time for explanations. He goes on to tell them about a race of creatures that lived on the planet called the Krell. In the past they had visited Earth, which explains why there are Earth animals on the planet. Morbius believes the Krell civilization collapsed in a single night, right on the verge of their greatest discovery. Today 2000 centuries later, nothing of their cities exists above ground.
Morbius then takes them on a tour of the Krell underground installation. Morbius first shows them a device for projecting their knowledge; he explains how he began to piece together information. Then an education device that projects images formed in the mind. Finally he explains what the Krell were expected to do, and how much lower human intelligence is in comparison.
Doc tries the intelligence tester but is confused when it does not register as high as Morbius. Morbius then explains it can also boost intelligence, and that the captain of the Belleraphon died using it. Morbius himself was badly injured but when he recovered his IQ had doubled.
Adams questions why all the equipment looks brand new. It is explained that all the machines left on the planet are self repairing and Morbius takes them on a tour of the rest of the installation. First they inspect a giant air vent that leads to the core of the planet. There are 400 other such shafts in the area and 9200 thermal reactors spread through the facilities 8000 cubic miles.
Later that night the crew has completed the security arrangements and tests the force field fence. Cookie asks permission to go outside the fence. He meets Robby who gives him the 60 gallons of bourbon. Outside, something hits the fence and shorts it out. The security team checks the breach but finds nothing. A series of foot like depressions begin forming leading to the ship. Something unseen enters the ship. A scream echos through the compound.
Back at the Morbius residence he argues that only he should be allowed to control the flow of Krell technology back to Earth. In the middle of the discussion, Adams is paged and told that the Chief Quinn has been murdered. Adams breaks of his discussions and heads back to the ship.
Later that night Doc finds the footprints and makes a cast. The foot makes no evolutionary sense. It seems to have elements of a four footed and biped creature; also it seems a predator and herbivore. Adams questions Cookie who was with the robot during the test and decides the robot was not responsible.
The next day at the funeral for Chief Morbius again warns him of impending doom facing the ship and crew. Adams considers this a challenge and spends the day fortifying the position around the ship. After testing the weapons and satisfied all that could be done has, the radar station suddenly reports movement in the distance moving slowly towards the ship.
No one sees anything despite the weapons being under radar fire control. The controller confirms a direct hit, but the object is still moving towards the ship. Suddenly something hits the force field fence, and a huge monster appears outlined in the energy flux. The crew open fire, but seem to do little good. A number of men move forward but a quickly killed.
Morbious wakes hearing the screams of Altair. Shes had a dream mimicking the attack that has just occurred. As Morbious is waking the creature in the force field disappears. Doc theories that the creature is made of some sort of energy, renewing itself second by second.
Adams takes Doc in the tractor to visit Morbius intending to evacuate him from the planet. He leaves orders for the ship to be readied for lift off. If he and Doc dont get back, the ship is to leave without them. They also want to try and break into Morbious office and take the brain booster test.
They are met at the door by Robby, who disarms them. Altair appears and countermands the orders given to Robby by her father. Seeing a chance Doc sneaks into the office. Altair argues with Adams about trying to make Morbius return home, she ultimately declares her love for him.
Robby appears carrying the injured Doc. Struggling to speak and heavy pain, Doc explains that the Krell succeeded in their great experiment. However they forgot about the sub conscious monsters they would release. Monsters from the id.
Morbius sees the dead body of Doc, and makes a series of ugly comments. His daughter reminds him that Doc is dead. Morbius lack of care convinces Altair she is better off going with Adams. Morbius tries to talk Adams out of taking Altair.
Adams demands an explanation of the id. Morbius realizes he is the source of the creature killing everyone. The machine the Krell built was able to release his inner beast, the sub conscious monster dwelling deep inside his ancestral mind.
Robby interrupts the debate to report something approaching the house. Morbius triggers the defensive shields of the house, which the creature begins to destroy. Morbius then orders Robby to destroy the creature, however Robby short circuits. Adams explained that it was useless; Robby knew it was Morbius self.
Adams, Altair and Morbius retreat to the Krell lab and sealed themselves in by sealing a special indestructible door. Adams convinces Morbius that he is really the monster, and that Morbius can not actually control his subconscious desires.
The group watch as the creature beings the slow process of burning through the door. Panicked Morbius implores Altair to say it is not so. Suddenly the full realization comes, and he understands that he could endanger or even kill Altair.
As the creature breaks through Morbius rushes forward and denies its existence. Suddenly the creature disappears but Morbius is mortally wounded. With his dying breath he instructs Adams to trigger a self destruct mechanism linked to the reactors of the great machine. The ship and crew have 24 hours to get as far away from the planet as possible
The next day we see the ship deep in space. Robby and Altair are onboard watching as the planet brightens and is destroyed. Adams assures Altair that her fathers memory will shine like a beacon.
Porites porites - in-situ fossil finger coral colony in the reef facies of the Cockburn Town Member, upper Grotto Beach Formation at the Cockburn Town Fossil Reef, western margin of San Salvador Island.
The Cockburn Town Fossil Reef is a well-preserved, well-exposed Pleistocene fossil reef. It consists of non-bedded to poorly-bedded, poorly-sorted, very coarse-grained, aragonitic fossiliferous limestones (grainstones and rubblestones), representing shallow marine deposition in reef and peri-reef facies. Cockburn Town Member reef facies rocks date to the MIS 5e sea level highstand event (early Late Pleistocene). Dated corals in the Cockburn Town Fossil Reef range in age from 114 to 127 ka.
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
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Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
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San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
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Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
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The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
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Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Borings in the Devil's Point Hardground (reef facies of the Cockburn Town Member, upper Grotto Beach Formation at the Cockburn Town Fossil Reef, western margin of San Salvador Island).
The Cockburn Town Fossil Reef is a well-preserved, well-exposed Pleistocene fossil reef. It consists of non-bedded to poorly-bedded, poorly-sorted, very coarse-grained, aragonitic fossiliferous limestones (grainstones and rubblestones), representing shallow marine deposition in reef and peri-reef facies. Cockburn Town Member reef facies rocks date to the MIS 5e sea level highstand event (early Late Pleistocene).
The subcircular borings shown above are incised into a limestone hardground surface that represents an unconformity traceable throughout the outcrop. The surface formed during a short-lived, mid-5e regression called the Devil's Point Event, dated to somewhere between 120 and 123 ka. After the event, high sea level returned. The Devil's Point Unconformity is present on most Bahamian islands and is traceable to Florida and Mexico. The more deeply flooded carbonate platforms in the Bahamas, such as Mayaguana Island, were not significantly affected by the mid-5e regression.
The rocks and fossils below the unconformity are referred to as "Reef 1". The rocks and fossils above are called "Reef 2". Isotopic dating has been done on 122 coral samples from the Cockburn Town Fossil Reef. The oldest is 127 ka and the youngest is 114.3 ka. Including dates from San Salvador Island to Great Inagua Island, Reef 1 has an average age of 123.5 ka, and Reef 2 has an average age of 119.5 ka.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Hanna Bay Member of the upper Rice Bay Formation at Graham's Harbour. This is the youngest bedrock unit on San Salvador Island.
These well-sorted limestones consist of sand-sized grains of aragonite (CaCO3). On the continents, many quartz sandstones are technically called quartz arenites. Because the sand grains making up these Bahamian rocks are calcareous (composed of calcium carbonate), the limestones are called calcarenites. When examined microscopically, the calcareous sand grains can be seen touching each other - the rock is grain-supported. This results in an alternative name for these Bahamian limestones - grainstones. “Calcarenite” seems to be a more useful, more thoroughly descriptive term for these particular rocks, so I use that, versus “grainstone” (although “calcarenitic grainstone” could be used as well). The little-used petrologic term aragonitite could also be applied to these aragonitic limestones.
Sedimentary structures indicate that the calcarenites shown above were deposited in an ancient back-beach sand dune environment. In such settings, sediments are moved and deposited by winds. Wind-deposited sedimentary rocks are often referred to as eolianites. Most ancient sand dune deposits in the rock record are composed of quartzose and/or lithic sand. The dune deposits in the Bahamas are composed of calcium carbonate - this results in the term "calcarenitic eolianite".
Hanna Bay Member limestones gently dip toward the modern ocean (= to the right in the above photo) and include sediments deposited in beach environments and back-beach dune environments. The latter facies is represented by the locality shown above. Beach facies limestones are more or less planar-bedded, while back-beach dune limestones (eolianites) have steeper and more varied dips.
The aragonite sand grains in the Hanna Bay Member are principally bioclasts (worn mollusc shell fragments & coral skeleton fragments & calcareous algae fragments, etc.) and peloids (tiny, pellet-shaped masses composed of micrite/very fine-grained carbonate - some are likely microcoprolites, others are of uncertain origin).
Age: Holocene (MIS 1)
Locality: shoreline outcrop along the eastern part of the southern margin of Graham's Harbour, between Singer Bar Point and the Bahamas Field Station, northeastern San Salvador Island, eastern Bahamas
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Bombyx mori, the domestic silkmoth, is an insect from the moth family Bombycidae. It is the closest relative of Bombyx mandarina, the wild silkmoth. The silkworm is the larva or caterpillar of a silkmoth. It is an economically important insect, being a primary producer of silk. A silkworm's preferred food is white mulberry leaves, though they may eat other mulberry species and even osage orange. Domestic silkmoths are closely dependent on humans for reproduction, as a result of millennia of selective breeding. Wild silkmoths are different from their domestic cousins as they have not been selectively bred; they are not as commercially viable in the production of silk.
Sericulture, the practice of breeding silkworms for the production of raw silk, has been under way for at least 5,000 years in China, whence it spread to India, Korea, Japan, and the West. The silkworm was domesticated from the wild silkmoth Bombyx mandarina, which has a range from northern India to northern China, Korea, Japan, and the far eastern regions of Russia. The domesticated silkworm derives from Chinese rather than Japanese or Korean stock.
Silkworms were unlikely to have been domestically bred before the Neolithic age. Before then, the tools to manufacture quantities of silk thread had not been developed. The domesticated B. mori and the wild B. mandarina can still breed and sometimes produce hybrids.
Domestic silkmoths are very different from most members in the genus Bombyx; not only have they lost the ability to fly, but their color pigments are also lost.
TYPES
Mulberry silkworms can be categorized into three different but connected groups or types. The major groups of silkworms fall under the univoltine ("uni-"=one, "voltine"=brood frequency) and bivoltine categories. The univoltine breed is generally linked with the geographical area within greater Europe. The eggs of this type hibernate during winter due to the cold climate, and cross-fertilize only by spring, generating silk only once annually. The second type is called bivoltine and is normally found in China, Japan, and Korea. The breeding process of this type takes place twice annually, a feat made possible through the slightly warmer climates and the resulting two life cycles. The polyvoltine type of mulberry silkworm can only be found in the tropics. The eggs are laid by female moths and hatch within nine to 12 days, so the resulting type can have up to eight separate life cycles throughout the year.
PROCESS
Eggs take about 14 days to hatch into larvae, which eat continuously. They have a preference for white mulberry, having an attraction to the mulberry odorant cis-jasmone. They are not monophagous since they can eat other species of Morus, as well as some other Moraceae, mostly Osage orange. They are covered with tiny black hairs. When the color of their heads turns darker, it indicates they are about to molt. After molting, the larval phase of the silkworms emerge white, naked, and with little horns on their backs.
After they have molted four times, their bodies become slightly yellow, and the skin becomes tighter. The larvae then prepare to enter the pupal phase of their lifecycle, and enclose themselves in a cocoon made up of raw silk produced by the salivary glands. The final molt from larva to pupa takes place within the cocoon, which provides a vital layer of protection during the vulnerable, almost motionless pupal state. Many other Lepidoptera produce cocoons, but only a few — the Bombycidae, in particular the genus Bombyx, and the Saturniidae, in particular the genus Antheraea — have been exploited for fabric production.
If the animal is allowed to survive after spinning its cocoon and through the pupal phase of its lifecycle, it releases proteolytic enzymes to make a hole in the cocoon so it can emerge as an adult moth. These enzymes are destructive to the silk and can cause the silk fibers to break down from over a mile in length to segments of random length, which seriously reduces the value of the silk threads, but not silk cocoons used as "stuffing" available in China and elsewhere for doonas, jackets etc. To prevent this, silkworm cocoons are boiled. The heat kills the silkworms and the water makes the cocoons easier to unravel. Often, the silkworm itself is eaten.
As the process of harvesting the silk from the cocoon kills the larva, sericulture has been criticized by animal welfare and rights activists. Mahatma Gandhi was critical of silk production based on the Ahimsa philosophy "not to hurt any living thing". This led to Gandhi's promotion of cotton spinning machines, an example of which can be seen at the Gandhi Institute. He also promoted Ahimsa silk, wild silk made from the cocoons of wild and semi-wild silk moths.
The moth – the adult phase of the lifecycle – is not capable of functional flight, in contrast to the wild B. mandarina and other Bombyx species, whose males fly to meet females and for evasion from predators. Some may emerge with the ability to lift off and stay airborne, but sustained flight cannot be achieved. This is because their bodies are too big and heavy for their small wings. However, some silkmoths can still fly. Silkmoths have a wingspan of 3–5 cm and a white, hairy body. Females are about two to three times bulkier than males (for they are carrying many eggs) but are similarly colored. Adult Bombycidae have reduced mouthparts and do not feed, though a human caretaker can feed them.
COCOON
The cocoon is made of a thread of raw silk from 300 to about 900 m long. The fibers are very fine and lustrous, about 10 μm in diameter. About 2,000 to 3,000 cocoons are required to make a pound of silk (0.4 kg). At least 70 million pounds of raw silk are produced each year, requiring nearly 10 billion cocoons.
RESEARCH
Due to its small size and ease of culture, the silkworm has become a model organism in the study of lepidopteran and arthropod biology. Fundamental findings on pheromones, hormones, brain structures, and physiology have been made with the silkworm. One example of this was the molecular identification of the first known pheromone, bombykol, which required extracts from 500,000 individuals, due to the very small quantities of pheromone produced by any individual worm.
Currently, research is focusing on genetics of silkworms and the possibility of genetic engineering. Many hundreds of strains are maintained, and over 400 Mendelian mutations have been described. Another source suggests 1,000 inbred domesticated strains are kept worldwide. One useful development for the silk industry is silkworms that can feed on food other than mulberry leaves, including an artificial diet. Research on the genome also raises the possibility of genetically engineering silkworms to produce proteins, including pharmacological drugs, in the place of silk proteins. Bombyx mori females are also one of the few organisms with homologous chromosomes held together only by the synaptonemal complex (and not crossovers) during meiosis.
Kraig Biocraft Laboratories has used research from the Universities of Wyoming and Notre Dame in a collaborative effort to create a silkworm that is genetically altered to produce spider silk. In September 2010, the effort was announced as successful.
Researchers at Tufts developed scaffolds made of spongy silk that feel and look similar to human tissue. They are implanted during reconstructive surgery to support or restructure damaged ligaments, tendons, and other tissue. They also created implants made of silk and drug compounds which can be implanted under the skin for steady and gradual time release of medications.
Researchers at the MIT Media Lab experimented with silkworms to see what they would weave when left on surfaces with different curvatures. They found that on particularly straight webs of lines, the worms would connect neighboring lines with silk, weaving directly onto the given shape. Using this knowledge they built a silk pavilion with 6,500 silkworms over a number of days.
Silkworms have been used in antibiotics discovery as they have several advantageous traits compared to other invertebrate models. Antibiotics such as lysocin E, a non-ribosomal peptide synthesized by Lysobacter sp. RH2180-5 and GPI0363 are among the notable antibiotics discovered using silkworms.
ON THE MOON
As of January 2, 2019, China's Chang'e-4 lander brought silkworms to the moon. A small microcosm 'tin' in the lander contained A. thaliana, seeds of potatoes, as well as silkworm eggs. As plants would support the silkworms with oxygen, and the silkworms would in turn provide the plants with necessary carbon dioxide and nutrients through their waste, researchers will evaluate whether plants successfully perform photosynthesis, and grow and bloom in the lunar environment.
DOMESTICATION
The domesticated form, compared to the wild form, has increased cocoon size, body size, growth rate, and efficiency of its digestion. It has gained tolerance to human presence and handling, and also to living in crowded conditions. The domesticated moth cannot fly, so it needs human assistance in finding a mate, and it lacks fear of potential predators. The native color pigments are also lost, so the domesticated moths are leucistic since camouflage isn't useful when they only live in captivity. These changes have made the domesticated strains entirely dependent upon humans for survival. The eggs are kept in incubators to aid in their hatching.
SILKWORM BREEDING
Silkworms were first domesticated in China over 5,000 years ago. Since then, the silk production capacity of the species has increased nearly tenfold. The silkworm is one of the few organisms wherein the principles of genetics and breeding were applied to harvest maximum outpu. It is second only to maize in exploiting the principles of heterosis and cross breeding.Silkworm breeding is aimed at the overall improvement of silkworm from a commercial point of view. The major objectives are improving fecundity (the egg-laying capacity of a breed), the health of larvae, quantity of cocoon and silk production, and disease resistance. Healthy larvae lead to a healthy cocoon crop. Health is dependent on factors such as better pupation rate, fewer dead larvae in the mountage, shorter larval duration (shorter larval duration lessens the chance of infection) and bluish-tinged fifth-instar larvae (which are healthier than the reddish-brown ones). Quantity of cocoon and silk produced are directly related to the pupation rate and larval weight. Healthier larvae have greater pupation rates and cocoon weights. Quality of cocoon and silk depends on a number of factors including genetics.
Hobby raising and school projects
In the US, teachers may sometimes introduce the insect life cycle to their students by raising silkworms in the classroom as a science project. Students have a chance to observe complete life cycles of insect from egg stage to larvae, pupa, moth.
The silkworm has been raised as a hobby in countries such as China, South Africa, Zimbabwe, and Iran. Children often pass on the eggs, creating a non-commercial population. The experience provides children with the opportunity to witness the life cycle of silkworms. The practice of raising silkworms by children as pets has, in non-silk farming South Africa, led to the development of extremely hardy landraces of silkworms, because they are invariably subjected to hardships not encountered by commercially farmed members of the species. However, these worms, not being selectively bred as such, are possibly inferior in silk production and may exhibit other undesirable traits.
GENOME
The full genome of the silkworm was published in 2008 by the International Silkworm Genome Consortium. Draft sequences were published in 2004.
The genome of the silkworm is mid-range with a genome size around 432 megabase pairs.
High genetic variability has been found in domestic lines of silkworms, though this is less than that among wild silkmoths (about 83 percent of wild genetic variation). This suggests a single event of domestication, and that it happened over a short period of time, with a large number of wild worms having been collected for domestication. Major questions, however, remain unanswered: "Whether this event was in a single location or in a short period of time in several locations cannot be deciphered from the data". Research also has yet to identify the area in China where domestication arose.
CUISINE
Silkworm pupae are eaten in some cultures.
In Assam, they are boiled for extracting silk and the boiled pupae are eaten directly with salt or fried with chilli pepper or herbs as a snack or dish.
In Korea, they are boiled and seasoned to make a popular snack food known as beondegi (번데기).
In China, street vendors sell roasted silkworm pupae.
In Japan, silkworms are usually served as a tsukudani (佃煮), i.e., boiled in a sweet-sour sauce made with soy sauce and sugar.
In Vietnam, this is known as con nhộng.
In Thailand, roasted silkworm is often sold at open markets. They are also sold as packaged snacks.
Silkworms have also been proposed for cultivation by astronauts as space food on long-term missions.
SILKWORM LEGENDS
In China, a legend indicates the discovery of the silkworm's silk was by an ancient empress Lei Zu, the wife of the Yellow Emperor and the daughter of XiLing-Shi. She was drinking tea under a tree when a silk cocoon fell into her tea. As she picked it out and started to wrap the silk thread around her finger, she slowly felt a warm sensation. When the silk ran out, she saw a small larva. In an instant, she realized this caterpillar larva was the source of the silk. She taught this to the people and it became widespread. Many more legends about the silkworm are told.
The Chinese guarded their knowledge of silk, but, according to one story, a Chinese princess given in marriage to a Khotan prince brought to the oasis the secret of silk manufacture, "hiding silkworms in her hair as part of her dowry", probably in the first half of the first century AD. About AD 550, Christian monks are said to have smuggled silkworms, in a hollow stick, out of China and sold the secret to the Byzantine Empire.
SILKWORM DISEASES
Beauveria bassiana, a fungus, destroys the entire silkworm body. This fungus usually appears when silkworms are raised under cold conditions with high humidity. This disease is not passed on to the eggs from moths, as the infected silkworms cannot survive to the moth stage. This fungus can spread to other insects.
Grasserie, also known as nuclear polyhedrosis, milky disease, or hanging disease, is caused by infection with the Bombyx mori nuclear polyhedrosis virus. If grasserie is observed in the chawkie stage, then the chawkie larvae must have been infected while hatching or during chawkie rearing. Infected eggs can be disinfected by cleaning their surfaces prior to hatching. Infections can occur as a result of improper hygiene in the chawkie rearing house. This disease develops faster in early instar rearing.
Pébrine is a disease caused by a parasitic microsporidian, N. bombycis. Diseased larvae show slow growth, undersized, pale and flaccid bodies, and poor appetite. Tiny black spots appear on larval integument. Additionally, dead larvae remain rubbery and do not undergo putrefaction after death. N. bombycis kills 100% of silkworms hatched from infected eggs. This disease can be carried over from worms to moths, then eggs and worms again. This microsporidium comes from the food the silkworms eat. Mother moths pass the disease to the eggs, and 100% of worms hatching from the diseased eggs will die in their worm stage. To prevent this disease, it is extremely important to rule out all eggs from infected moths by checking the moth's body fluid under a microscope.
Flacherie infected silkworms look weak and are colored dark brown before they die. The disease destroys the larva's gut and is caused by viruses or poisonous food.
Several diseases caused by a variety of funguses are collectively named Muscardine.
WIKIPEDIA
This is the original with a few changes. I've fixed some dynamic issues with the soundtrack (notes hit too hard -- I'm an awful pianist) and changed the transitions and added a "pan over still frame" sequence.
As I mentioned in the original, this was an attempt to make the entire production my own by composing a performing a simple piano theme to "frame" the images and complete the mood.
If for any reason you can't play it properly here, it's also on YouTube: Silk Mill Reveries (New Edit)
Let me know what you think, thanks.
For those interested: all the images here were shot with either a Olympus OM-D EM5 and E-PL5. I've since sold those and standardized on Panasonic bodies because I like the handling better for what I do. Photo editing was done on Lightroom 4 and video editing was done on Adobe Premiere Elements.
The soundtrack was recorded digitally using the inexpensive Avid Pro Tools workstation kit. It basically features a multi-track audio recorder and MIDI sequencer, a wide selection of sampled and synthesized instuments, and a cheapie USB music keyboard for less than $100. If you can use a piano keyboard or play instruments this is a cheap way to do recording the results are surprisingly good at this price point.
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Also, please visit the Entropic Remnants website, my Entropic Remnants blog, and my Entropic Remnants YouTube page -- THANKS!
Pisolites in a basket structure under a calcrete paleosol that caps the Grotto Beach Formation (lower Upper Pleistocene) at Watling's Quarry, southwestern San Salvador Island, eastern Bahamas.
Pisolites are moderately large versions of oolites - they’re >2 mm-sized, subspherical to ellipsoidal, concentrically to irregularly concentrically laminated structures, commonly composed of calcium carbonate (as these are). They are often perceived to be biogenic in origin. Pisolites are not uncommon below calcrete/caliche paleosol horizons.
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
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Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
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San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
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Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
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The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
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Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Borings in the Devil's Point Hardground (reef facies of the Cockburn Town Member, upper Grotto Beach Formation at the Cockburn Town Fossil Reef, western margin of San Salvador Island).
The Cockburn Town Fossil Reef is a well-preserved, well-exposed Pleistocene fossil reef. It consists of non-bedded to poorly-bedded, poorly-sorted, very coarse-grained, aragonitic fossiliferous limestones (grainstones and rubblestones), representing shallow marine deposition in reef and peri-reef facies. Cockburn Town Member reef facies rocks date to the MIS 5e sea level highstand event (early Late Pleistocene).
The subcircular borings shown above are incised into a limestone hardground surface that represents an unconformity traceable throughout the outcrop. The surface formed during a short-lived, mid-5e regression called the Devil's Point Event, dated to somewhere between 120 and 123 ka. After the event, high sea level returned. The Devil's Point Unconformity is present on most Bahamian islands and is traceable to Florida and Mexico. The more deeply flooded carbonate platforms in the Bahamas, such as Mayaguana Island, were not significantly affected by the mid-5e regression.
The rocks and fossils below the unconformity are referred to as "Reef 1". The rocks and fossils above are called "Reef 2". Isotopic dating has been done on 122 coral samples from the Cockburn Town Fossil Reef. The oldest is 127 ka and the youngest is 114.3 ka. Including dates from San Salvador Island to Great Inagua Island, Reef 1 has an average age of 123.5 ka, and Reef 2 has an average age of 119.5 ka.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Calcrete paleosol atop horizon of vegemorphs (rhizocretions) at Green Cay, offshore-northwestern San Salvador Island, eastern Bahamas.
The dominant paleosol type on San Salvador Island (& other Bahamian islands) consists of hard, reddish-brown to orangish-brown colored, irregularly-sculpted crusts. These are referred to as calcretes or caliches or terra rosas. Calcrete paleosols cap all of the Pleistocene-aged stratigraphic units, except where removed by erosion. The Holocene-aged units (Hanna Bay Member & North Point Member of the Rice Bay Formation) haven’t been around long enough to develop calcrete paleosols atop their outcrops.
Many Bahamian calcrete paleosols have underlying fossil root structures called vegemorphs, which are terrestrial fossils consisting of irregularly curvilinear, often downward-branching structures having a subcircular cross-section. They represent the position of roots of ancient plants. Vegemorphs are traditionally called rhizoliths or rhizocretions or rhizo-ichnomorphs, or simply “root traces”. The root word of the 1st three terms, “rhizo-”, literally means “roots”. It has been demonstrated that these structures sometimes include the stem portions of ancient plants. In recognition of this, these genetic terms have been replaced by the descriptive term “vegemorph” in the recent Bahamas geology literature. On San Salvador Island, vegemorphs are common below calcrete paleosol horizons and in regressive eolian calcarenite units. These structures are usually preferentially cemented by calcium carbonate. With differential weathering and erosion, the surrounding sediments get removed and the three dimensional morphology of the fossil roots can be easily examined.
The calcrete horizon shown above has been dated to 9.2 ka (early Holocene). It caps a Pleistocene limestone unit that is probably the Owl's Hole Formation, according to John Mylroie.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Hanna Bay Member of the upper Rice Bay Formation at Grotto Beach. This is the youngest bedrock unit on San Salvador Island.
These well-sorted limestones consist of sand-sized grains of aragonite (CaCO3). On the continents, many quartz sandstones are technically called quartz arenites. Because the sand grains making up these Bahamian rocks are calcareous (composed of calcium carbonate), the limestones are called calcarenites. When examined microscopically, the calcareous sand grains can be seen touching each other - the rock is grain-supported. This results in an alternative name for these Bahamian limestones - grainstones. “Calcarenite” seems to be a more useful, more thoroughly descriptive term for these particular rocks, so I use that, versus “grainstone” (although “calcarenitic grainstone” could be used as well). The little-used petrologic term aragonitite could also be applied to these aragonitic limestones.
Hanna Bay Member limestones are more or less planar-bedded, and gently dip toward the modern ocean. The seaward dip, the sorting, the occurrence of more coarse-grained, finely fragmented seashell horizons, plus preserved sedimentary structures on some bedding planes such as bubble porosity and swash lines, indicate that these Hanna Bay Member rocks represent beach deposits. At other localities, the Hanna Bay Member includes back beach dune facies.
At the locality shown above (Grotto Beach), the lithified beach deposits are exposed two meters above current, mean sea level. Some geologists have taken this as evidence for a mid-Holocene highstand, and that modern sea level is lower than it was during portions of the mid-Holocene. A similar conclusion has been reached based on geologic evidence from elsewhere in the New World and the Old World. Recent work on this very Hanna Bay Member outcrop has thrown doubt on the validity of the mid-Holocene highstand interpretation (Savarese & Hoeflein, 2012).
The aragonite sand grains in the Hanna Bay Member are principally bioclasts (worn mollusc shell fragments & coral skeleton fragments & calcareous algae fragments, etc.) and peloids (tiny, pellet-shaped masses composed of micrite/very fine-grained carbonate - some are likely microcoprolites, others are of uncertain origin).
Age: Holocene (MIS 1)
Locality: shoreline outcrop along the southwestern margin of Grotto Bay, southwestern San Salvador Island, eastern Bahamas
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Reference cited:
Savarese, M. & F.J. Hoeflein. 2012. Sea level and the paleoenvironmental interpretation of the middle to upper Holocene Hanna Bay Limestone, San Salvador, Bahamas: a high foreshore setting without a higher-than-present eustatic highstand. pp. 163-183 in Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions.
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
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Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
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San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
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Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
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The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
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Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Bombyx mori, the domestic silkmoth, is an insect from the moth family Bombycidae. It is the closest relative of Bombyx mandarina, the wild silkmoth. The silkworm is the larva or caterpillar of a silkmoth. It is an economically important insect, being a primary producer of silk. A silkworm's preferred food is white mulberry leaves, though they may eat other mulberry species and even osage orange. Domestic silkmoths are closely dependent on humans for reproduction, as a result of millennia of selective breeding. Wild silkmoths are different from their domestic cousins as they have not been selectively bred; they are not as commercially viable in the production of silk.
Sericulture, the practice of breeding silkworms for the production of raw silk, has been under way for at least 5,000 years in China, whence it spread to India, Korea, Japan, and the West. The silkworm was domesticated from the wild silkmoth Bombyx mandarina, which has a range from northern India to northern China, Korea, Japan, and the far eastern regions of Russia. The domesticated silkworm derives from Chinese rather than Japanese or Korean stock.
Silkworms were unlikely to have been domestically bred before the Neolithic age. Before then, the tools to manufacture quantities of silk thread had not been developed. The domesticated B. mori and the wild B. mandarina can still breed and sometimes produce hybrids.
Domestic silkmoths are very different from most members in the genus Bombyx; not only have they lost the ability to fly, but their color pigments are also lost.
TYPES
Mulberry silkworms can be categorized into three different but connected groups or types. The major groups of silkworms fall under the univoltine ("uni-"=one, "voltine"=brood frequency) and bivoltine categories. The univoltine breed is generally linked with the geographical area within greater Europe. The eggs of this type hibernate during winter due to the cold climate, and cross-fertilize only by spring, generating silk only once annually. The second type is called bivoltine and is normally found in China, Japan, and Korea. The breeding process of this type takes place twice annually, a feat made possible through the slightly warmer climates and the resulting two life cycles. The polyvoltine type of mulberry silkworm can only be found in the tropics. The eggs are laid by female moths and hatch within nine to 12 days, so the resulting type can have up to eight separate life cycles throughout the year.
PROCESS
Eggs take about 14 days to hatch into larvae, which eat continuously. They have a preference for white mulberry, having an attraction to the mulberry odorant cis-jasmone. They are not monophagous since they can eat other species of Morus, as well as some other Moraceae, mostly Osage orange. They are covered with tiny black hairs. When the color of their heads turns darker, it indicates they are about to molt. After molting, the larval phase of the silkworms emerge white, naked, and with little horns on their backs.
After they have molted four times, their bodies become slightly yellow, and the skin becomes tighter. The larvae then prepare to enter the pupal phase of their lifecycle, and enclose themselves in a cocoon made up of raw silk produced by the salivary glands. The final molt from larva to pupa takes place within the cocoon, which provides a vital layer of protection during the vulnerable, almost motionless pupal state. Many other Lepidoptera produce cocoons, but only a few — the Bombycidae, in particular the genus Bombyx, and the Saturniidae, in particular the genus Antheraea — have been exploited for fabric production.
If the animal is allowed to survive after spinning its cocoon and through the pupal phase of its lifecycle, it releases proteolytic enzymes to make a hole in the cocoon so it can emerge as an adult moth. These enzymes are destructive to the silk and can cause the silk fibers to break down from over a mile in length to segments of random length, which seriously reduces the value of the silk threads, but not silk cocoons used as "stuffing" available in China and elsewhere for doonas, jackets etc. To prevent this, silkworm cocoons are boiled. The heat kills the silkworms and the water makes the cocoons easier to unravel. Often, the silkworm itself is eaten.
As the process of harvesting the silk from the cocoon kills the larva, sericulture has been criticized by animal welfare and rights activists. Mahatma Gandhi was critical of silk production based on the Ahimsa philosophy "not to hurt any living thing". This led to Gandhi's promotion of cotton spinning machines, an example of which can be seen at the Gandhi Institute. He also promoted Ahimsa silk, wild silk made from the cocoons of wild and semi-wild silk moths.
The moth – the adult phase of the lifecycle – is not capable of functional flight, in contrast to the wild B. mandarina and other Bombyx species, whose males fly to meet females and for evasion from predators. Some may emerge with the ability to lift off and stay airborne, but sustained flight cannot be achieved. This is because their bodies are too big and heavy for their small wings. However, some silkmoths can still fly. Silkmoths have a wingspan of 3–5 cm and a white, hairy body. Females are about two to three times bulkier than males (for they are carrying many eggs) but are similarly colored. Adult Bombycidae have reduced mouthparts and do not feed, though a human caretaker can feed them.
COCOON
The cocoon is made of a thread of raw silk from 300 to about 900 m long. The fibers are very fine and lustrous, about 10 μm in diameter. About 2,000 to 3,000 cocoons are required to make a pound of silk (0.4 kg). At least 70 million pounds of raw silk are produced each year, requiring nearly 10 billion cocoons.
RESEARCH
Due to its small size and ease of culture, the silkworm has become a model organism in the study of lepidopteran and arthropod biology. Fundamental findings on pheromones, hormones, brain structures, and physiology have been made with the silkworm. One example of this was the molecular identification of the first known pheromone, bombykol, which required extracts from 500,000 individuals, due to the very small quantities of pheromone produced by any individual worm.
Currently, research is focusing on genetics of silkworms and the possibility of genetic engineering. Many hundreds of strains are maintained, and over 400 Mendelian mutations have been described. Another source suggests 1,000 inbred domesticated strains are kept worldwide. One useful development for the silk industry is silkworms that can feed on food other than mulberry leaves, including an artificial diet. Research on the genome also raises the possibility of genetically engineering silkworms to produce proteins, including pharmacological drugs, in the place of silk proteins. Bombyx mori females are also one of the few organisms with homologous chromosomes held together only by the synaptonemal complex (and not crossovers) during meiosis.
Kraig Biocraft Laboratories has used research from the Universities of Wyoming and Notre Dame in a collaborative effort to create a silkworm that is genetically altered to produce spider silk. In September 2010, the effort was announced as successful.
Researchers at Tufts developed scaffolds made of spongy silk that feel and look similar to human tissue. They are implanted during reconstructive surgery to support or restructure damaged ligaments, tendons, and other tissue. They also created implants made of silk and drug compounds which can be implanted under the skin for steady and gradual time release of medications.
Researchers at the MIT Media Lab experimented with silkworms to see what they would weave when left on surfaces with different curvatures. They found that on particularly straight webs of lines, the worms would connect neighboring lines with silk, weaving directly onto the given shape. Using this knowledge they built a silk pavilion with 6,500 silkworms over a number of days.
Silkworms have been used in antibiotics discovery as they have several advantageous traits compared to other invertebrate models. Antibiotics such as lysocin E, a non-ribosomal peptide synthesized by Lysobacter sp. RH2180-5 and GPI0363 are among the notable antibiotics discovered using silkworms.
ON THE MOON
As of January 2, 2019, China's Chang'e-4 lander brought silkworms to the moon. A small microcosm 'tin' in the lander contained A. thaliana, seeds of potatoes, as well as silkworm eggs. As plants would support the silkworms with oxygen, and the silkworms would in turn provide the plants with necessary carbon dioxide and nutrients through their waste, researchers will evaluate whether plants successfully perform photosynthesis, and grow and bloom in the lunar environment.
DOMESTICATION
The domesticated form, compared to the wild form, has increased cocoon size, body size, growth rate, and efficiency of its digestion. It has gained tolerance to human presence and handling, and also to living in crowded conditions. The domesticated moth cannot fly, so it needs human assistance in finding a mate, and it lacks fear of potential predators. The native color pigments are also lost, so the domesticated moths are leucistic since camouflage isn't useful when they only live in captivity. These changes have made the domesticated strains entirely dependent upon humans for survival. The eggs are kept in incubators to aid in their hatching.
SILKWORM BREEDING
Silkworms were first domesticated in China over 5,000 years ago. Since then, the silk production capacity of the species has increased nearly tenfold. The silkworm is one of the few organisms wherein the principles of genetics and breeding were applied to harvest maximum outpu. It is second only to maize in exploiting the principles of heterosis and cross breeding.Silkworm breeding is aimed at the overall improvement of silkworm from a commercial point of view. The major objectives are improving fecundity (the egg-laying capacity of a breed), the health of larvae, quantity of cocoon and silk production, and disease resistance. Healthy larvae lead to a healthy cocoon crop. Health is dependent on factors such as better pupation rate, fewer dead larvae in the mountage, shorter larval duration (shorter larval duration lessens the chance of infection) and bluish-tinged fifth-instar larvae (which are healthier than the reddish-brown ones). Quantity of cocoon and silk produced are directly related to the pupation rate and larval weight. Healthier larvae have greater pupation rates and cocoon weights. Quality of cocoon and silk depends on a number of factors including genetics.
Hobby raising and school projects
In the US, teachers may sometimes introduce the insect life cycle to their students by raising silkworms in the classroom as a science project. Students have a chance to observe complete life cycles of insect from egg stage to larvae, pupa, moth.
The silkworm has been raised as a hobby in countries such as China, South Africa, Zimbabwe, and Iran. Children often pass on the eggs, creating a non-commercial population. The experience provides children with the opportunity to witness the life cycle of silkworms. The practice of raising silkworms by children as pets has, in non-silk farming South Africa, led to the development of extremely hardy landraces of silkworms, because they are invariably subjected to hardships not encountered by commercially farmed members of the species. However, these worms, not being selectively bred as such, are possibly inferior in silk production and may exhibit other undesirable traits.
GENOME
The full genome of the silkworm was published in 2008 by the International Silkworm Genome Consortium. Draft sequences were published in 2004.
The genome of the silkworm is mid-range with a genome size around 432 megabase pairs.
High genetic variability has been found in domestic lines of silkworms, though this is less than that among wild silkmoths (about 83 percent of wild genetic variation). This suggests a single event of domestication, and that it happened over a short period of time, with a large number of wild worms having been collected for domestication. Major questions, however, remain unanswered: "Whether this event was in a single location or in a short period of time in several locations cannot be deciphered from the data". Research also has yet to identify the area in China where domestication arose.
CUISINE
Silkworm pupae are eaten in some cultures.
In Assam, they are boiled for extracting silk and the boiled pupae are eaten directly with salt or fried with chilli pepper or herbs as a snack or dish.
In Korea, they are boiled and seasoned to make a popular snack food known as beondegi (번데기).
In China, street vendors sell roasted silkworm pupae.
In Japan, silkworms are usually served as a tsukudani (佃煮), i.e., boiled in a sweet-sour sauce made with soy sauce and sugar.
In Vietnam, this is known as con nhộng.
In Thailand, roasted silkworm is often sold at open markets. They are also sold as packaged snacks.
Silkworms have also been proposed for cultivation by astronauts as space food on long-term missions.
SILKWORM LEGENDS
In China, a legend indicates the discovery of the silkworm's silk was by an ancient empress Lei Zu, the wife of the Yellow Emperor and the daughter of XiLing-Shi. She was drinking tea under a tree when a silk cocoon fell into her tea. As she picked it out and started to wrap the silk thread around her finger, she slowly felt a warm sensation. When the silk ran out, she saw a small larva. In an instant, she realized this caterpillar larva was the source of the silk. She taught this to the people and it became widespread. Many more legends about the silkworm are told.
The Chinese guarded their knowledge of silk, but, according to one story, a Chinese princess given in marriage to a Khotan prince brought to the oasis the secret of silk manufacture, "hiding silkworms in her hair as part of her dowry", probably in the first half of the first century AD. About AD 550, Christian monks are said to have smuggled silkworms, in a hollow stick, out of China and sold the secret to the Byzantine Empire.
SILKWORM DISEASES
Beauveria bassiana, a fungus, destroys the entire silkworm body. This fungus usually appears when silkworms are raised under cold conditions with high humidity. This disease is not passed on to the eggs from moths, as the infected silkworms cannot survive to the moth stage. This fungus can spread to other insects.
Grasserie, also known as nuclear polyhedrosis, milky disease, or hanging disease, is caused by infection with the Bombyx mori nuclear polyhedrosis virus. If grasserie is observed in the chawkie stage, then the chawkie larvae must have been infected while hatching or during chawkie rearing. Infected eggs can be disinfected by cleaning their surfaces prior to hatching. Infections can occur as a result of improper hygiene in the chawkie rearing house. This disease develops faster in early instar rearing.
Pébrine is a disease caused by a parasitic microsporidian, N. bombycis. Diseased larvae show slow growth, undersized, pale and flaccid bodies, and poor appetite. Tiny black spots appear on larval integument. Additionally, dead larvae remain rubbery and do not undergo putrefaction after death. N. bombycis kills 100% of silkworms hatched from infected eggs. This disease can be carried over from worms to moths, then eggs and worms again. This microsporidium comes from the food the silkworms eat. Mother moths pass the disease to the eggs, and 100% of worms hatching from the diseased eggs will die in their worm stage. To prevent this disease, it is extremely important to rule out all eggs from infected moths by checking the moth's body fluid under a microscope.
Flacherie infected silkworms look weak and are colored dark brown before they die. The disease destroys the larva's gut and is caused by viruses or poisonous food.
Several diseases caused by a variety of funguses are collectively named Muscardine.
WIKIPEDIA
"Fleeting Impressions" is a visual metaphor crafted by Duncan Rawlinson, capturing the interplay of warmth and coolness that parallels the dynamic of certain relationships. This piece combines the meticulousness of photography with the fluidity of AI innovation to depict the contrasting dance of hot and cold hues. It reflects the complexities of connections that oscillate between passion and tranquility, much like the natural interplay of sunlight and shadow. Just as in human relations, the image holds spaces where warmth seeps into the coolness, suggesting a balance that is both delicate and evocative, a nuanced blend that Duncan skillfully brings to life through his artistic exploration.
PLEASE, no multi invitations, glitters or self promotion in your comments. My photos are FREE for anyone to use, just give me credit and it would be nice if you let me know. Thanks
No pictures are allowed in the Sistine Chapel, they just appear in the camera..... (I have to upload 3 sets)
One of the most famous places in the world, the Sistine Chapel is the site where the conclave for the election of the popes and other solemn pontifical ceremonies are held. Built between 1475 and 1481, the chapel takes its name from Pope Sixtus IV, who commissioned it.
The frescoes on the long walls illustrate parallel events in the Lives of Moses and Christ and constitute a complex of extraordinary interest executed between 1481 and 1483 by Perugino, Botticelli, Cosimo Rosselli and Domenico Ghirlandaio, with their respective groups of assistants, who included Pinturicchio, Piero di Cosimo and others; later Luca Signorelli also joined the group.
The barrel-vaulted ceiling is entirely covered by the famous frescoes which Michelangelo painted between 1508 and 1512 for Julius II. The original design was only to have represented the Apostles, but was modified at the artist's insistence to encompass an enormously complex iconographic theme which may be synthesized as the representation of mankind waiting for the coming of the Messiah. More than twenty years later, Michelangelo was summoned back by Paul III (1534-49) to paint the Last Judgement on the wall behind the altar. He worked on it from 1536 to 1541.
PLEASE, no multi invitations, glitters or self promotion in your comments. My photos are FREE for anyone to use, just give me credit and it would be nice if you let me know. Thanks
No pictures are allowed in the Sistine Chapel, they just appear in the camera..... (I have to upload 3 sets)
One of the most famous places in the world, the Sistine Chapel is the site where the conclave for the election of the popes and other solemn pontifical ceremonies are held. Built between 1475 and 1481, the chapel takes its name from Pope Sixtus IV, who commissioned it.
The frescoes on the long walls illustrate parallel events in the Lives of Moses and Christ and constitute a complex of extraordinary interest executed between 1481 and 1483 by Perugino, Botticelli, Cosimo Rosselli and Domenico Ghirlandaio, with their respective groups of assistants, who included Pinturicchio, Piero di Cosimo and others; later Luca Signorelli also joined the group.
The barrel-vaulted ceiling is entirely covered by the famous frescoes which Michelangelo painted between 1508 and 1512 for Julius II. The original design was only to have represented the Apostles, but was modified at the artist's insistence to encompass an enormously complex iconographic theme which may be synthesized as the representation of mankind waiting for the coming of the Messiah. More than twenty years later, Michelangelo was summoned back by Paul III (1534-49) to paint the Last Judgement on the wall behind the altar. He worked on it from 1536 to 1541.
Opening scene
It is late in the 22nd Century. United Planet cruiser C57D a year out from Earth base on the way to Altair for a special mission. Commander J.J Adams (Leslie Neilsen) orders the crew to the deceleration booths as the ship drops from light speed to normal space.
Adams orders pilot Jerry Farman (Jack Kelly) to lay in a course for the fourth planet. The captain then briefs the crew that they are at their destination, and that they are to look for survivors from the Bellerophon expedition 20 years earlier.
As they orbit the planet looking for signs of life, the ship is scanned by a radar facility some 20 square miles in area. Morbius (Walter Pigeon) contacts the ship from the planet asking why the ship is here. Morbius goes on to explain he requires nothing, no rescue is required and he can't guarantee the safety of the ship or its crew.
Adams confirms that Morbius was a member of the original crew, but is puzzled at the cryptic warning Morbius realizes the ship is going to land regardless, and gives the pilot coordinates in a desert region of the planet. The ship lands and security details deploy. Within minutes a high speed dust cloud approaches the ship. Adams realizes it is a vehicle, and as it arrives the driver is discovered to be a robot (Robby). Robby welcomes the crew to Altair 4 and invites members of the crew to Morbious residence.
Adams, Farman and Doc Ostrow (Warren Stevens) arrive at the residence and are greeted by Morbius. They sit down to a meal prepared by Robbys food synthesizer and Morbius shows the visitors Robbys other abilities, including his unwavering obedience. Morbius then gives Robby a blaster with orders to shoot Adams. Robby refuses and goes into a mechanical mind lock, disabling him till the order is changed.
Morbius then shows the men the defense system of the house (A series of steel shutters). When questioned, Morbius admits that the Belleraphon crew is dead, Morbius and his wife being the only original survivors. Morbius's wife has also died, but months after the others and from natural causes. Morbius goes on to explain many of the crew were torn limb from limb by a strange creature or force living on the planet. The Belleraphon herself was destroyed when the final three surviving members tried to take off for Earth.
Adams wonders why this force has remained dormant all these years and never attacked Morbius. As discussions continue, a young woman Altaira (Anne Francis) introduces herself as Morbius daughter. Farman takes an immediate interest in Altaira, and begins to flirt with her . Altaira then shows the men her ability to control wild animals by petting a wild tiger. During this display the ship checks in on the safety of the away party. Adams explains he will need to check in with Earth for further orders and begins preparations for sending a signal. Because of the power needed the ship will be disabled for up to 10 days. Morbius is mortified by this extended period and offers Robby's services in building the communication facility
The next day Robby arrives at ship as the crew unloads the engine to power the transmitter. To lighten the tense moment the commander instructs the crane driver to pick up Cookie (Earl Holliman) and move him out of the way. Quinn interrupts the practical joke to report that the assembly is complete and they can transmit in the morning.
Meanwhile Cookie goes looking for Robby and organizes for the robot to synthesize some bourbon. Robby takes a sample and tells Cookie he can have 60 gallons ready the next morning for him.
Farman continues to court Altair by teaching her how to kiss, and the health benefits of kissing. Adams interrupts the exercise, and is clearly annoyed with a mix of jealous. He then explains to Altair that the clothes she wears are inappropriate around his crew. Altair tries to argue till Adams looses patience and order Altair to leave the area.
That night, Altair, still furious, explains to her father what occurred. Altair takes Adams advice to heart and orders Robby to run up a less revealing dress. Meanwhile back at the ship two security guards think they hear breathing in the darkness but see nothing.
Inside the ship, one of the crew half asleep sees the inner hatch opened and some material moved around. Next morning the Captain holds court on the events of the night before. Quinn advises the captain that most of the missing and damaged equipment can be replaced except for the Clystron monitor. Angry the Capt and Doc go back to Morbius to confront him about what has occurred.
Morbius is unavailable, so the two men settle in to wait. Outside Adams sees Altair swimming and goes to speak to her. Thinking she is naked, Adams becomes flustered and unsettled till he realizes she wants him to see her new dress. Altair asks why Adams wont kiss her like everyone else has. He gives in and plants one on her. Behind them a tiger emerges from the forest and attacks Altair, Adams reacts by shooting it. Altair is badly troubled by the incident, the tiger had been her friend, but she can't understand why acted as if she was an enemy.
Returning to the house, Doc and Adams accidently open Morbius office. They find a series of strange drawings but no sign of Morbius. He appears through a secret door and is outraged at the intrusion. Adams explains the damage done to the ship the previous night and his concern that Morbius was behind the attack.
Morbius admits it is time for explanations. He goes on to tell them about a race of creatures that lived on the planet called the Krell. In the past they had visited Earth, which explains why there are Earth animals on the planet. Morbius believes the Krell civilization collapsed in a single night, right on the verge of their greatest discovery. Today 2000 centuries later, nothing of their cities exists above ground.
Morbius then takes them on a tour of the Krell underground installation. Morbius first shows them a device for projecting their knowledge; he explains how he began to piece together information. Then an education device that projects images formed in the mind. Finally he explains what the Krell were expected to do, and how much lower human intelligence is in comparison.
Doc tries the intelligence tester but is confused when it does not register as high as Morbius. Morbius then explains it can also boost intelligence, and that the captain of the Belleraphon died using it. Morbius himself was badly injured but when he recovered his IQ had doubled.
Adams questions why all the equipment looks brand new. It is explained that all the machines left on the planet are self repairing and Morbius takes them on a tour of the rest of the installation. First they inspect a giant air vent that leads to the core of the planet. There are 400 other such shafts in the area and 9200 thermal reactors spread through the facilities 8000 cubic miles.
Later that night the crew has completed the security arrangements and tests the force field fence. Cookie asks permission to go outside the fence. He meets Robby who gives him the 60 gallons of bourbon. Outside, something hits the fence and shorts it out. The security team checks the breach but finds nothing. A series of foot like depressions begin forming leading to the ship. Something unseen enters the ship. A scream echos through the compound.
Back at the Morbius residence he argues that only he should be allowed to control the flow of Krell technology back to Earth. In the middle of the discussion, Adams is paged and told that the Chief Quinn has been murdered. Adams breaks of his discussions and heads back to the ship.
Later that night Doc finds the footprints and makes a cast. The foot makes no evolutionary sense. It seems to have elements of a four footed and biped creature; also it seems a predator and herbivore. Adams questions Cookie who was with the robot during the test and decides the robot was not responsible.
The next day at the funeral for Chief Morbius again warns him of impending doom facing the ship and crew. Adams considers this a challenge and spends the day fortifying the position around the ship. After testing the weapons and satisfied all that could be done has, the radar station suddenly reports movement in the distance moving slowly towards the ship.
No one sees anything despite the weapons being under radar fire control. The controller confirms a direct hit, but the object is still moving towards the ship. Suddenly something hits the force field fence, and a huge monster appears outlined in the energy flux. The crew open fire, but seem to do little good. A number of men move forward but a quickly killed.
Morbious wakes hearing the screams of Altair. Shes had a dream mimicking the attack that has just occurred. As Morbious is waking the creature in the force field disappears. Doc theories that the creature is made of some sort of energy, renewing itself second by second.
Adams takes Doc in the tractor to visit Morbius intending to evacuate him from the planet. He leaves orders for the ship to be readied for lift off. If he and Doc dont get back, the ship is to leave without them. They also want to try and break into Morbious office and take the brain booster test.
They are met at the door by Robby, who disarms them. Altair appears and countermands the orders given to Robby by her father. Seeing a chance Doc sneaks into the office. Altair argues with Adams about trying to make Morbius return home, she ultimately declares her love for him.
Robby appears carrying the injured Doc. Struggling to speak and heavy pain, Doc explains that the Krell succeeded in their great experiment. However they forgot about the sub conscious monsters they would release. Monsters from the id.
Morbius sees the dead body of Doc, and makes a series of ugly comments. His daughter reminds him that Doc is dead. Morbius lack of care convinces Altair she is better off going with Adams. Morbius tries to talk Adams out of taking Altair.
Adams demands an explanation of the id. Morbius realizes he is the source of the creature killing everyone. The machine the Krell built was able to release his inner beast, the sub conscious monster dwelling deep inside his ancestral mind.
Robby interrupts the debate to report something approaching the house. Morbius triggers the defensive shields of the house, which the creature begins to destroy. Morbius then orders Robby to destroy the creature, however Robby short circuits. Adams explained that it was useless; Robby knew it was Morbius self.
Adams, Altair and Morbius retreat to the Krell lab and sealed themselves in by sealing a special indestructible door. Adams convinces Morbius that he is really the monster, and that Morbius can not actually control his subconscious desires.
The group watch as the creature beings the slow process of burning through the door. Panicked Morbius implores Altair to say it is not so. Suddenly the full realization comes, and he understands that he could endanger or even kill Altair.
As the creature breaks through Morbius rushes forward and denies its existence. Suddenly the creature disappears but Morbius is mortally wounded. With his dying breath he instructs Adams to trigger a self destruct mechanism linked to the reactors of the great machine. The ship and crew have 24 hours to get as far away from the planet as possible
The next day we see the ship deep in space. Robby and Altair are onboard watching as the planet brightens and is destroyed. Adams assures Altair that her fathers memory will shine like a beacon.
Opening scene
It is late in the 22nd Century. United Planet cruiser C57D a year out from Earth base on the way to Altair for a special mission. Commander J.J Adams (Leslie Neilsen) orders the crew to the deceleration booths as the ship drops from light speed to normal space.
Adams orders pilot Jerry Farman (Jack Kelly) to lay in a course for the fourth planet. The captain then briefs the crew that they are at their destination, and that they are to look for survivors from the Bellerophon expedition 20 years earlier.
As they orbit the planet looking for signs of life, the ship is scanned by a radar facility some 20 square miles in area. Morbius (Walter Pigeon) contacts the ship from the planet asking why the ship is here. Morbius goes on to explain he requires nothing, no rescue is required and he can't guarantee the safety of the ship or its crew.
Adams confirms that Morbius was a member of the original crew, but is puzzled at the cryptic warning Morbius realizes the ship is going to land regardless, and gives the pilot coordinates in a desert region of the planet. The ship lands and security details deploy. Within minutes a high speed dust cloud approaches the ship. Adams realizes it is a vehicle, and as it arrives the driver is discovered to be a robot (Robby). Robby welcomes the crew to Altair 4 and invites members of the crew to Morbious residence.
Adams, Farman and Doc Ostrow (Warren Stevens) arrive at the residence and are greeted by Morbius. They sit down to a meal prepared by Robbys food synthesizer and Morbius shows the visitors Robbys other abilities, including his unwavering obedience. Morbius then gives Robby a blaster with orders to shoot Adams. Robby refuses and goes into a mechanical mind lock, disabling him till the order is changed.
Morbius then shows the men the defense system of the house (A series of steel shutters). When questioned, Morbius admits that the Belleraphon crew is dead, Morbius and his wife being the only original survivors. Morbius's wife has also died, but months after the others and from natural causes. Morbius goes on to explain many of the crew were torn limb from limb by a strange creature or force living on the planet. The Belleraphon herself was destroyed when the final three surviving members tried to take off for Earth.
Adams wonders why this force has remained dormant all these years and never attacked Morbius. As discussions continue, a young woman Altaira (Anne Francis) introduces herself as Morbius daughter. Farman takes an immediate interest in Altaira, and begins to flirt with her . Altaira then shows the men her ability to control wild animals by petting a wild tiger. During this display the ship checks in on the safety of the away party. Adams explains he will need to check in with Earth for further orders and begins preparations for sending a signal. Because of the power needed the ship will be disabled for up to 10 days. Morbius is mortified by this extended period and offers Robby's services in building the communication facility
The next day Robby arrives at ship as the crew unloads the engine to power the transmitter. To lighten the tense moment the commander instructs the crane driver to pick up Cookie (Earl Holliman) and move him out of the way. Quinn interrupts the practical joke to report that the assembly is complete and they can transmit in the morning.
Meanwhile Cookie goes looking for Robby and organizes for the robot to synthesize some bourbon. Robby takes a sample and tells Cookie he can have 60 gallons ready the next morning for him.
Farman continues to court Altair by teaching her how to kiss, and the health benefits of kissing. Adams interrupts the exercise, and is clearly annoyed with a mix of jealous. He then explains to Altair that the clothes she wears are inappropriate around his crew. Altair tries to argue till Adams looses patience and order Altair to leave the area.
That night, Altair, still furious, explains to her father what occurred. Altair takes Adams advice to heart and orders Robby to run up a less revealing dress. Meanwhile back at the ship two security guards think they hear breathing in the darkness but see nothing.
Inside the ship, one of the crew half asleep sees the inner hatch opened and some material moved around. Next morning the Captain holds court on the events of the night before. Quinn advises the captain that most of the missing and damaged equipment can be replaced except for the Clystron monitor. Angry the Capt and Doc go back to Morbius to confront him about what has occurred.
Morbius is unavailable, so the two men settle in to wait. Outside Adams sees Altair swimming and goes to speak to her. Thinking she is naked, Adams becomes flustered and unsettled till he realizes she wants him to see her new dress. Altair asks why Adams wont kiss her like everyone else has. He gives in and plants one on her. Behind them a tiger emerges from the forest and attacks Altair, Adams reacts by shooting it. Altair is badly troubled by the incident, the tiger had been her friend, but she can't understand why acted as if she was an enemy.
Returning to the house, Doc and Adams accidently open Morbius office. They find a series of strange drawings but no sign of Morbius. He appears through a secret door and is outraged at the intrusion. Adams explains the damage done to the ship the previous night and his concern that Morbius was behind the attack.
Morbius admits it is time for explanations. He goes on to tell them about a race of creatures that lived on the planet called the Krell. In the past they had visited Earth, which explains why there are Earth animals on the planet. Morbius believes the Krell civilization collapsed in a single night, right on the verge of their greatest discovery. Today 2000 centuries later, nothing of their cities exists above ground.
Morbius then takes them on a tour of the Krell underground installation. Morbius first shows them a device for projecting their knowledge; he explains how he began to piece together information. Then an education device that projects images formed in the mind. Finally he explains what the Krell were expected to do, and how much lower human intelligence is in comparison.
Doc tries the intelligence tester but is confused when it does not register as high as Morbius. Morbius then explains it can also boost intelligence, and that the captain of the Belleraphon died using it. Morbius himself was badly injured but when he recovered his IQ had doubled.
Adams questions why all the equipment looks brand new. It is explained that all the machines left on the planet are self repairing and Morbius takes them on a tour of the rest of the installation. First they inspect a giant air vent that leads to the core of the planet. There are 400 other such shafts in the area and 9200 thermal reactors spread through the facilities 8000 cubic miles.
Later that night the crew has completed the security arrangements and tests the force field fence. Cookie asks permission to go outside the fence. He meets Robby who gives him the 60 gallons of bourbon. Outside, something hits the fence and shorts it out. The security team checks the breach but finds nothing. A series of foot like depressions begin forming leading to the ship. Something unseen enters the ship. A scream echos through the compound.
Back at the Morbius residence he argues that only he should be allowed to control the flow of Krell technology back to Earth. In the middle of the discussion, Adams is paged and told that the Chief Quinn has been murdered. Adams breaks of his discussions and heads back to the ship.
Later that night Doc finds the footprints and makes a cast. The foot makes no evolutionary sense. It seems to have elements of a four footed and biped creature; also it seems a predator and herbivore. Adams questions Cookie who was with the robot during the test and decides the robot was not responsible.
The next day at the funeral for Chief Morbius again warns him of impending doom facing the ship and crew. Adams considers this a challenge and spends the day fortifying the position around the ship. After testing the weapons and satisfied all that could be done has, the radar station suddenly reports movement in the distance moving slowly towards the ship.
No one sees anything despite the weapons being under radar fire control. The controller confirms a direct hit, but the object is still moving towards the ship. Suddenly something hits the force field fence, and a huge monster appears outlined in the energy flux. The crew open fire, but seem to do little good. A number of men move forward but a quickly killed.
Morbious wakes hearing the screams of Altair. Shes had a dream mimicking the attack that has just occurred. As Morbious is waking the creature in the force field disappears. Doc theories that the creature is made of some sort of energy, renewing itself second by second.
Adams takes Doc in the tractor to visit Morbius intending to evacuate him from the planet. He leaves orders for the ship to be readied for lift off. If he and Doc dont get back, the ship is to leave without them. They also want to try and break into Morbious office and take the brain booster test.
They are met at the door by Robby, who disarms them. Altair appears and countermands the orders given to Robby by her father. Seeing a chance Doc sneaks into the office. Altair argues with Adams about trying to make Morbius return home, she ultimately declares her love for him.
Robby appears carrying the injured Doc. Struggling to speak and heavy pain, Doc explains that the Krell succeeded in their great experiment. However they forgot about the sub conscious monsters they would release. Monsters from the id.
Morbius sees the dead body of Doc, and makes a series of ugly comments. His daughter reminds him that Doc is dead. Morbius lack of care convinces Altair she is better off going with Adams. Morbius tries to talk Adams out of taking Altair.
Adams demands an explanation of the id. Morbius realizes he is the source of the creature killing everyone. The machine the Krell built was able to release his inner beast, the sub conscious monster dwelling deep inside his ancestral mind.
Robby interrupts the debate to report something approaching the house. Morbius triggers the defensive shields of the house, which the creature begins to destroy. Morbius then orders Robby to destroy the creature, however Robby short circuits. Adams explained that it was useless; Robby knew it was Morbius self.
Adams, Altair and Morbius retreat to the Krell lab and sealed themselves in by sealing a special indestructible door. Adams convinces Morbius that he is really the monster, and that Morbius can not actually control his subconscious desires.
The group watch as the creature beings the slow process of burning through the door. Panicked Morbius implores Altair to say it is not so. Suddenly the full realization comes, and he understands that he could endanger or even kill Altair.
As the creature breaks through Morbius rushes forward and denies its existence. Suddenly the creature disappears but Morbius is mortally wounded. With his dying breath he instructs Adams to trigger a self destruct mechanism linked to the reactors of the great machine. The ship and crew have 24 hours to get as far away from the planet as possible
The next day we see the ship deep in space. Robby and Altair are onboard watching as the planet brightens and is destroyed. Adams assures Altair that her fathers memory will shine like a beacon.
Fossiliferous limestone of the Grotto Beach Formation (Upper Pleistocene) along a trail due west of Pain Pond, northeastern San Salvador Island, eastern Bahamas. (camera lens for scale)
The fossiliferous limestone shown above is dominated by fossil bivalves, principally Codakia orbicularis (Linnaeus, 1758) - the tiger lucine clam. This is part of the Cockburn Town Member of the Grotto Beach Limestone (lower Upper Pleistocene, Sangamonian, MIS 5e, 119-131 ka).
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
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The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
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Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
In-situ fossil scleractinian coral colonies on the Devil's Point Hardground in the reef facies of the Cockburn Town Member, upper Grotto Beach Formation at the Cockburn Town Fossil Reef, western margin of San Salvador Island.
The Cockburn Town Fossil Reef is a well-preserved, well-exposed Pleistocene fossil reef. It consists of non-bedded to poorly-bedded, poorly-sorted, very coarse-grained, aragonitic fossiliferous limestones (grainstones and rubblestones), representing shallow marine deposition in reef and peri-reef facies. Cockburn Town Member reef facies rocks date to the MIS 5e sea level highstand event (early Late Pleistocene).
The fossil corals shown above are encrusting an irregular surface. This surface is an unconformity and is traceable throughout the outcrop. It represents a limestone hardground surface that formed during a short-lived, mid-5e regression called the Devil's Point Event, dated to somewhere between 120 and 123 ka. After the event, high sea level returned. These corals were some of the earliest inhabitants of this locality’s shallow seafloor after the mid-5e regression. The Devil's Point Unconformity is present on most Bahamian islands and is traceable to Florida and Mexico. The more deeply flooded carbonate platforms in the Bahamas, such as Mayaguana Island, were not significantly affected by the mid-5e regression.
The rocks and fossils below the unconformity are referred to as "Reef 1". The rocks and fossils above are called "Reef 2". Isotopic dating has been done on 122 coral samples from the Cockburn Town Fossil Reef. The oldest is 127 ka and the youngest is 114.3 ka. Including dates from San Salvador Island to Great Inagua Island, Reef 1 has an average age of 123.5 ka, and Reef 2 has an average age of 119.5 ka.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
"Spaghetti encrusters" on the Devil's Point Hardground (reef facies of the Cockburn Town Member, upper Grotto Beach Formation at the Cockburn Town Fossil Reef, western margin of San Salvador Island).
The Cockburn Town Fossil Reef is a well-preserved, well-exposed Pleistocene fossil reef. It consists of non-bedded to poorly-bedded, poorly-sorted, very coarse-grained, aragonitic fossiliferous limestones (grainstones and rubblestones), representing shallow marine deposition in reef and peri-reef facies. Cockburn Town Member reef facies rocks date to the MIS 5e sea level highstand event (early Late Pleistocene).
The vermiform fossils shown above are encrusting a limestone hardground surface that represents an unconformity traceable throughout the outcrop. The surface formed during a short-lived, mid-5e regression called the Devil's Point Event, dated to somewhere between 120 and 123 ka. After the event, high sea level returned. The Devil's Point Unconformity is present on most Bahamian islands and is traceable to Florida and Mexico. The more deeply flooded carbonate platforms in the Bahamas, such as Mayaguana Island, were not significantly affected by the mid-5e regression.
The rocks and fossils below the unconformity are referred to as "Reef 1". The rocks and fossils above are called "Reef 2". Isotopic dating has been done on 122 coral samples from the Cockburn Town Fossil Reef. The oldest is 127 ka and the youngest is 114.3 ka. Including dates from San Salvador Island to Great Inagua Island, Reef 1 has an average age of 123.5 ka, and Reef 2 has an average age of 119.5 ka.
The encrusting fossils shown above are unidentified and have been nicknamed "spaghetti encrusters". This organism is not known from modern shallow marine environments around San Salvador Island. One geologist has speculated that they might be agglutinated foraminifera.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Pacific Northwest National Laboratory scientists synthesize spinel that can be used to encapsulate volatile radionuclides from the Hanford waste to increase their retention during the vitrification process. This scanning electron micrograph of crystalline trevorite spinel (NiFe2O4) was made by heating oxide constituents in a molten salt flux within an evacuated and sealed fused quartz ampoule.
Terms of Use: Our images are freely and publicly available for use with the credit line, "Courtesy of Pacific Northwest National Laboratory." Please use provided caption information for use in appropriate context.
Watercolor; 44 x 28 cm.
Spanish painter. based in madrid from 1909, he was self-taught and began by copying pictures by diego velázquez and el greco in the prado. he received support from the poet juan ramón jiménez and established links with such young poets and artists as federico garcía lorca, rafael alberti, salvador dalí and luis buñuel. in 1925, when he participated in the artistas ibéricos exhibition (madrid, casón buen retiro), his work consisted of mildly abstracted landscapes and cubist still-lifes. after several lengthy spells in paris between 1926 and 1928, where he met picasso, he held a one-man exhibition at the palacio de bibliotecas y museos in madrid (1928), his unconventional choice of material—including combinations of oils, soil and sand—scandalizing both critics and visitors. his work developed towards abstraction under the influence of joan miró and was marked also by surrealism in an effort to synthesize the iberian spirit with the avant-garde.
Department of Mythology
© 2006 2018 Photo by Lloyd Thrap Photography
for Halo Media Group
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No pictures are allowed in the Sistine Chapel, they just appear in the camera..... (I have to upload 3 sets)
One of the most famous places in the world, the Sistine Chapel is the site where the conclave for the election of the popes and other solemn pontifical ceremonies are held. Built between 1475 and 1481, the chapel takes its name from Pope Sixtus IV, who commissioned it.
The frescoes on the long walls illustrate parallel events in the Lives of Moses and Christ and constitute a complex of extraordinary interest executed between 1481 and 1483 by Perugino, Botticelli, Cosimo Rosselli and Domenico Ghirlandaio, with their respective groups of assistants, who included Pinturicchio, Piero di Cosimo and others; later Luca Signorelli also joined the group.
The barrel-vaulted ceiling is entirely covered by the famous frescoes which Michelangelo painted between 1508 and 1512 for Julius II. The original design was only to have represented the Apostles, but was modified at the artist's insistence to encompass an enormously complex iconographic theme which may be synthesized as the representation of mankind waiting for the coming of the Messiah. More than twenty years later, Michelangelo was summoned back by Paul III (1534-49) to paint the Last Judgement on the wall behind the altar. He worked on it from 1536 to 1541.
Kunstraum Richard Sorge presents the first large overview in Germany of Dutch artist Gert-Jan Akerboom’s ink drawings on paper. The artist executed several large murals, turning the presentation into an immersive experience.
Eschewing easily interpretable statements in his work, Gert-Jan Akerboom prefers ambiguous signals, dreamlike in nature; they can be interpreted in myriad ways, none of them right or wrong. His drawings take their energy from this unfixed, shifting view of reality, synthesizing precise observation and associative speculation about alternative possibilities.
Akerboom’s drawings are filled with the objects and themes that trigger his “dreamwatching” state of mind: Architecture, archeology, ruins, mystic or religious sites and ritual. Collaging the possibilities and impossibilities of these inspirations, wedding them with fragments of popular culture, like Manga, computer graphics, photography and Street-art, the artist lets us witness candid, highly obsessive, painstakingly precise results that are proof of an unique sensibility and imagination.
Noted London based curator Ken Pratt has spoken of Akerboom's "deftness of skill":
“What Akerboom chooses to highlight –or place in shadow- with this most traditional of artistic crafts often makes a dramatic difference to what we actually see. What, in effect, could be fairly straightforward scenes are transformed into strange vistas with distorted perspective and areas of against-the-grain light and shade that change the normal into the mystical and ritualistic.”
Located at a romantically crumbling historic Berlin brewery, host of many art & event spaces and music studios, Kunstraum Richard Sorge reaches a young, and international audience, but adventurous discerning art lovers as well. The bountiful space is snugly hidden inside the building's Street-art covered walls. The artist-run art space focuses its exhibitions on subversive crafts and subcultures. Like the spy Richard Sorge, it independently works from a marginal, yet cosmopolitan position to ultimately save the world.
Exhibition duration: Prolonged until August 31, 2009
Open Wednesday, Saturday, Sunday, 3 - 7 pm, and by appointment
Exhibition venue: Kunstraum Richard Sorge, Landsberger Allee 54, 10249 Berlin-Friedrichshain
Uncut Pressbooks (2) (Multiple Pages, 12" X 17").
With stellar performances by Walter Pidgeon, Anne Francis, and Leslie Nielsen and state-of-the-art special effects, this film is one of the most beloved sci-fi classics of all time. Based loosely on the Shakespeare play The Tempest, the story, set in the early 2200s, involves the crew of a United Planets cruiser who find Dr. Morbius, his daughter Altaira, and Robby the Robot living on what they thought was a deserted planet. The very rare, uncut pressbook offered here includes two heralds, one of which advertises a coloring contest inspired by the film. Also included is a pressbook from The Invisible Boy (MGM, 1957), which was the other film to star Robby the Robot, and includes a two-color herald.
Opening scene
It is late in the 22nd Century. United Planet cruiser C57D a year out from Earth base on the way to Altair for a special mission. Commander J.J Adams (Leslie Neilsen) orders the crew to the deceleration booths as the ship drops from light speed to normal space.
Adams orders pilot Jerry Farman (Jack Kelly) to lay in a course for the fourth planet. The captain then briefs the crew that they are at their destination, and that they are to look for survivors from the Bellerophon expedition 20 years earlier.
As they orbit the planet looking for signs of life, the ship is scanned by a radar facility some 20 square miles in area. Morbius (Walter Pigeon) contacts the ship from the planet asking why the ship is here. Morbius goes on to explain he requires nothing, no rescue is required and he can't guarantee the safety of the ship or its crew.
Adams confirms that Morbius was a member of the original crew, but is puzzled at the cryptic warning Morbius realizes the ship is going to land regardless, and gives the pilot coordinates in a desert region of the planet. The ship lands and security details deploy. Within minutes a high speed dust cloud approaches the ship. Adams realizes it is a vehicle, and as it arrives the driver is discovered to be a robot (Robby). Robby welcomes the crew to Altair 4 and invites members of the crew to Morbious residence.
Adams, Farman and Doc Ostrow (Warren Stevens) arrive at the residence and are greeted by Morbius. They sit down to a meal prepared by Robbys food synthesizer and Morbius shows the visitors Robbys other abilities, including his unwavering obedience. Morbius then gives Robby a blaster with orders to shoot Adams. Robby refuses and goes into a mechanical mind lock, disabling him till the order is changed.
Morbius then shows the men the defense system of the house (A series of steel shutters). When questioned, Morbius admits that the Belleraphon crew is dead, Morbius and his wife being the only original survivors. Morbius's wife has also died, but months after the others and from natural causes. Morbius goes on to explain many of the crew were torn limb from limb by a strange creature or force living on the planet. The Belleraphon herself was destroyed when the final three surviving members tried to take off for Earth.
Adams wonders why this force has remained dormant all these years and never attacked Morbius. As discussions continue, a young woman Altaira (Anne Francis) introduces herself as Morbius daughter. Farman takes an immediate interest in Altaira, and begins to flirt with her . Altaira then shows the men her ability to control wild animals by petting a wild tiger. During this display the ship checks in on the safety of the away party. Adams explains he will need to check in with Earth for further orders and begins preparations for sending a signal. Because of the power needed the ship will be disabled for up to 10 days. Morbius is mortified by this extended period and offers Robby's services in building the communication facility
The next day Robby arrives at ship as the crew unloads the engine to power the transmitter. To lighten the tense moment the commander instructs the crane driver to pick up Cookie (Earl Holliman) and move him out of the way. Quinn interrupts the practical joke to report that the assembly is complete and they can transmit in the morning.
Meanwhile Cookie goes looking for Robby and organizes for the robot to synthesize some bourbon. Robby takes a sample and tells Cookie he can have 60 gallons ready the next morning for him.
Farman continues to court Altair by teaching her how to kiss, and the health benefits of kissing. Adams interrupts the exercise, and is clearly annoyed with a mix of jealous. He then explains to Altair that the clothes she wears are inappropriate around his crew. Altair tries to argue till Adams looses patience and order Altair to leave the area.
That night, Altair, still furious, explains to her father what occurred. Altair takes Adams advice to heart and orders Robby to run up a less revealing dress. Meanwhile back at the ship two security guards think they hear breathing in the darkness but see nothing.
Inside the ship, one of the crew half asleep sees the inner hatch opened and some material moved around. Next morning the Captain holds court on the events of the night before. Quinn advises the captain that most of the missing and damaged equipment can be replaced except for the Clystron monitor. Angry the Capt and Doc go back to Morbius to confront him about what has occurred.
Morbius is unavailable, so the two men settle in to wait. Outside Adams sees Altair swimming and goes to speak to her. Thinking she is naked, Adams becomes flustered and unsettled till he realizes she wants him to see her new dress. Altair asks why Adams wont kiss her like everyone else has. He gives in and plants one on her. Behind them a tiger emerges from the forest and attacks Altair, Adams reacts by shooting it. Altair is badly troubled by the incident, the tiger had been her friend, but she can't understand why acted as if she was an enemy.
Returning to the house, Doc and Adams accidently open Morbius office. They find a series of strange drawings but no sign of Morbius. He appears through a secret door and is outraged at the intrusion. Adams explains the damage done to the ship the previous night and his concern that Morbius was behind the attack.
Morbius admits it is time for explanations. He goes on to tell them about a race of creatures that lived on the planet called the Krell. In the past they had visited Earth, which explains why there are Earth animals on the planet. Morbius believes the Krell civilization collapsed in a single night, right on the verge of their greatest discovery. Today 2000 centuries later, nothing of their cities exists above ground.
Morbius then takes them on a tour of the Krell underground installation. Morbius first shows them a device for projecting their knowledge; he explains how he began to piece together information. Then an education device that projects images formed in the mind. Finally he explains what the Krell were expected to do, and how much lower human intelligence is in comparison.
Doc tries the intelligence tester but is confused when it does not register as high as Morbius. Morbius then explains it can also boost intelligence, and that the captain of the Belleraphon died using it. Morbius himself was badly injured but when he recovered his IQ had doubled.
Adams questions why all the equipment looks brand new. It is explained that all the machines left on the planet are self repairing and Morbius takes them on a tour of the rest of the installation. First they inspect a giant air vent that leads to the core of the planet. There are 400 other such shafts in the area and 9200 thermal reactors spread through the facilities 8000 cubic miles.
Later that night the crew has completed the security arrangements and tests the force field fence. Cookie asks permission to go outside the fence. He meets Robby who gives him the 60 gallons of bourbon. Outside, something hits the fence and shorts it out. The security team checks the breach but finds nothing. A series of foot like depressions begin forming leading to the ship. Something unseen enters the ship. A scream echos through the compound.
Back at the Morbius residence he argues that only he should be allowed to control the flow of Krell technology back to Earth. In the middle of the discussion, Adams is paged and told that the Chief Quinn has been murdered. Adams breaks of his discussions and heads back to the ship.
Later that night Doc finds the footprints and makes a cast. The foot makes no evolutionary sense. It seems to have elements of a four footed and biped creature; also it seems a predator and herbivore. Adams questions Cookie who was with the robot during the test and decides the robot was not responsible.
The next day at the funeral for Chief Morbius again warns him of impending doom facing the ship and crew. Adams considers this a challenge and spends the day fortifying the position around the ship. After testing the weapons and satisfied all that could be done has, the radar station suddenly reports movement in the distance moving slowly towards the ship.
No one sees anything despite the weapons being under radar fire control. The controller confirms a direct hit, but the object is still moving towards the ship. Suddenly something hits the force field fence, and a huge monster appears outlined in the energy flux. The crew open fire, but seem to do little good. A number of men move forward but a quickly killed.
Morbious wakes hearing the screams of Altair. Shes had a dream mimicking the attack that has just occurred. As Morbious is waking the creature in the force field disappears. Doc theories that the creature is made of some sort of energy, renewing itself second by second.
Adams takes Doc in the tractor to visit Morbius intending to evacuate him from the planet. He leaves orders for the ship to be readied for lift off. If he and Doc dont get back, the ship is to leave without them. They also want to try and break into Morbious office and take the brain booster test.
They are met at the door by Robby, who disarms them. Altair appears and countermands the orders given to Robby by her father. Seeing a chance Doc sneaks into the office. Altair argues with Adams about trying to make Morbius return home, she ultimately declares her love for him.
Robby appears carrying the injured Doc. Struggling to speak and heavy pain, Doc explains that the Krell succeeded in their great experiment. However they forgot about the sub conscious monsters they would release. Monsters from the id.
Morbius sees the dead body of Doc, and makes a series of ugly comments. His daughter reminds him that Doc is dead. Morbius lack of care convinces Altair she is better off going with Adams. Morbius tries to talk Adams out of taking Altair.
Adams demands an explanation of the id. Morbius realizes he is the source of the creature killing everyone. The machine the Krell built was able to release his inner beast, the sub conscious monster dwelling deep inside his ancestral mind.
Robby interrupts the debate to report something approaching the house. Morbius triggers the defensive shields of the house, which the creature begins to destroy. Morbius then orders Robby to destroy the creature, however Robby short circuits. Adams explained that it was useless; Robby knew it was Morbius self.
Adams, Altair and Morbius retreat to the Krell lab and sealed themselves in by sealing a special indestructible door. Adams convinces Morbius that he is really the monster, and that Morbius can not actually control his subconscious desires.
The group watch as the creature beings the slow process of burning through the door. Panicked Morbius implores Altair to say it is not so. Suddenly the full realization comes, and he understands that he could endanger or even kill Altair.
As the creature breaks through Morbius rushes forward and denies its existence. Suddenly the creature disappears but Morbius is mortally wounded. With his dying breath he instructs Adams to trigger a self destruct mechanism linked to the reactors of the great machine. The ship and crew have 24 hours to get as far away from the planet as possible
The next day we see the ship deep in space. Robby and Altair are onboard watching as the planet brightens and is destroyed. Adams assures Altair that her fathers memory will shine like a beacon.
Hanna Bay Member of the upper Rice Bay Formation at Graham's Harbour. This is the youngest bedrock unit on San Salvador Island.
These well-sorted limestones consist of sand-sized grains of aragonite (CaCO3). On the continents, many quartz sandstones are technically called quartz arenites. Because the sand grains making up these Bahamian rocks are calcareous (composed of calcium carbonate), the limestones are called calcarenites. When examined microscopically, the calcareous sand grains can be seen touching each other - the rock is grain-supported. This results in an alternative name for these Bahamian limestones - grainstones. “Calcarenite” seems to be a more useful, more thoroughly descriptive term for these particular rocks, so I use that, versus “grainstone” (although “calcarenitic grainstone” could be used as well). The little-used petrologic term aragonitite could also be applied to these aragonitic limestones.
Sedimentary structures indicate that the calcarenites shown above were deposited in an ancient back-beach sand dune environment. In such settings, sediments are moved and deposited by winds. Wind-deposited sedimentary rocks are often referred to as eolianites. Most ancient sand dune deposits in the rock record are composed of quartzose and/or lithic sand. The dune deposits in the Bahamas are composed of calcium carbonate - this results in the term "calcarenitic eolianite".
Hanna Bay Member limestones gently dip toward the modern ocean (= behind the photographer in the above photo) and include sediments deposited in beach environments and back-beach dune environments. The latter facies is represented by the locality shown above. Beach facies limestones are more or less planar-bedded, while back-beach dune limestones (eolianites) have steeper and more varied dips.
The aragonite sand grains in the Hanna Bay Member are principally bioclasts (worn mollusc shell fragments & coral skeleton fragments & calcareous algae fragments, etc.) and peloids (tiny, pellet-shaped masses composed of micrite/very fine-grained carbonate - some are likely microcoprolites, others are of uncertain origin).
Age: Holocene (MIS 1)
Locality: shoreline outcrop along the eastern part of the southern margin of Graham's Harbour, between Singer Bar Point and the Bahamas Field Station, northeastern San Salvador Island, eastern Bahamas
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
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Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
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San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
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Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Model: Tammy Anderson.
Location: Old Town
Albuquerque, New Mexico. USA
© 2013 Photo by Lloyd Thrap Photography for modelshopstudio™
Lloyd-Thrap-Creative-Photography
All works subject to applicable copyright laws. This intellectual property MAY NOT BE DOWNLOADED except by normal viewing process of the browser. The intellectual property may not be copied to another computer, transmitted , published, reproduced, stored, manipulated, projected, or altered in any way, including without limitation any digitization or synthesizing of the images, alone or with any other material, by use of computer or other electronic means or any other method or means now or hereafter known, without the written permission of Lloyd Thrap and payment of a fee or arrangement thereof.
No images are within Public Domain. Use of any image as the basis for another photographic concept or illustration is a violation of copyright.
Sayuri Pacheco works in California State University, Northridge (CSUN) professor Thomas Minehan’s organic chemistry lab, doing research synthesizing major groove DNA. Pachecho is a trainee in the BUILD PODER program, CSUN’s Building Infrastructure Leading to Diversity (BUILD) program, which is part of the NIH Common Fund’s Diversity Program Consortium.
Credit: Vanessa Cisneros
PLEASE, no multi invitations, glitters or self promotion in your comments. My photos are FREE for anyone to use, just give me credit and it would be nice if you let me know. Thanks
No pictures are allowed in the Sistine Chapel, they just appear in the camera..... (I have to upload 3 sets)
One of the most famous places in the world, the Sistine Chapel is the site where the conclave for the election of the popes and other solemn pontifical ceremonies are held. Built between 1475 and 1481, the chapel takes its name from Pope Sixtus IV, who commissioned it.
The frescoes on the long walls illustrate parallel events in the Lives of Moses and Christ and constitute a complex of extraordinary interest executed between 1481 and 1483 by Perugino, Botticelli, Cosimo Rosselli and Domenico Ghirlandaio, with their respective groups of assistants, who included Pinturicchio, Piero di Cosimo and others; later Luca Signorelli also joined the group.
The barrel-vaulted ceiling is entirely covered by the famous frescoes which Michelangelo painted between 1508 and 1512 for Julius II. The original design was only to have represented the Apostles, but was modified at the artist's insistence to encompass an enormously complex iconographic theme which may be synthesized as the representation of mankind waiting for the coming of the Messiah. More than twenty years later, Michelangelo was summoned back by Paul III (1534-49) to paint the Last Judgement on the wall behind the altar. He worked on it from 1536 to 1541.
Is it possible to synthesize the soul of a city through photographs of its buildings? The work of Michele Molinari heads in that direction, overlooking the Buenos Aires of historic monuments and focusing on the common dwellings that stud the skyline of the porteña city. They are boundary lines by day and by night, suburban intersections trying to spur on the vertical expansion of the city. Molinari’s interesting experiment is to go back to the same places after a period of time to crystalize the changes and witness the immanence of certain corners of the urban fabric. – A. Trabucco
How emotional it is to admire Buenos Aires at dusk. The passers-by are hurrying along the sidewalks and distractedly look at the camera lens. With curious or perplexed glances. […] The essence of the obscurity is easier to enjoy in the quieter neighborhoods. […] The sense of calm even appears to reach the historic center in one of the few photos of monumental Buenos Aires included in the book. The circle closes. Every splintered scrap of the urban fabric is recomposed under the protective wing of the night. – A. Mauri
CABA - Ciudad Autonoma de Buenos Aires is a photobook. Photographs and essay by Michele Molinari, more essays by Andrea Mauri and Alessandro Trabucco. [essays are in English, Spanish and Italian]
CABA comes in 2 printed editions by Blurb, Pocket Edition [7x7in, 18x18cm, 132 pages, Standard Photo paper, Flexible High-Gloss Laminated cover, 106 color photos] and Deluxe Edition [8x10in, 20x25cm, 134 pages, ProLine Pearl Photo paper, Hardcover with Dust Jacket, 107 color photos], and one Digital Edition by Apple iBooks that features 107 + 7 bonus color photos.
CABA won Bronze Award at TIFA2020 Book/Documentary
Find it here: michelemolinari.info/2020/07/25/caba/
CABA - Ciudad Autonoma de Buenos Aires
Is it possible to synthesize the soul of a city through photographs of its buildings? The work of Michele Molinari heads in that direction, overlooking the Buenos Aires of historic monuments and focusing on the common dwellings that stud the skyline of the porteña city. They are boundary lines by day and by night, suburban intersections trying to spur on the vertical expansion of the city. Molinari’s interesting experiment is to go back to the same places after a period of time to crystalize the changes and witness the immanence of certain corners of the urban fabric. – Alessandro Trabucco
How emotional it is to admire Buenos Aires at dusk. The passers-by are hurrying along the sidewalks and distractedly look at the camera lens. With curious or perplexed glances. […] The essence of the obscurity is easier to enjoy in the quieter neighborhoods. […] The sense of calm even appears to reach the historic center in one of the few photos of monumental Buenos Aires included in the book. The circle closes. Every splintered scrap of the urban fabric is recomposed under the protective wing of the night. – Andrea Mauri
CABA - Ciudad Autonoma de Buenos Aires is a photobook. Photographs and essay by Michele Molinari, more essays by Andrea Mauri and Alessandro Trabucco. [essays are in English, Spanish and Italian]
CABA comes in 2 printed editions by Blurb, Pocket Edition [7x7in, 18x18cm, 132 pages, Standard Photo paper, Flexible High-Gloss Laminated cover, 106 color photos] and Deluxe Edition [8x10in, 20x25cm, 134 pages, ProLine Pearl Photo paper, Hardcover with Dust Jacket, 107 color photos], and one Digital Edition by Apple iBooks that features 107 + 7 bonus color photos.
CABA won Bronze Award at TIFA2020 Book/Documentary
Find it here: michelemolinari.info/2020/07/25/caba/
The Crescent Nebula was produced by a massive star shedding its outer Hydrogen envelope on its way to eventually becoming a Supernova. This event marked the end of the star’s Red Supergiant Phase of its life-cycle. The core of the star that produced the nebula was so hot that the outward radiation pressure from it exceeded the inward pressure of gravity. As a result, the outer gaseous envelope above the core was ejected 200,000 to 400,000 years ago forming the delicate emission nebula that is still in the process of expanding away from the naked stellar core today. NGC 6888 is about 5,000 light years from Earth and is 26 light years in diameter. It is roughly the size of half a full Moon in the night sky of the Northern Hemisphere.
The naked stellar core is now classified as a Wolf-Rayet star which is also known a Helium star. The spectrum of the Wolf-Rayet stellar core shows that the dominant nuclear elements in the exposed core are Helium, Carbon, and Oxygen. The naked core will continue to synthesize heavier nuclear elements until Iron is produced in the future. At that point, the nuclear synthesis process will abruptly halt causing a near instantaneous collapse of the core which will trigger a Supernova explosion sometime in the next million years. The violence of the explosion will produce heavier nuclear elements like Silver, Gold, and Uranium for example.
All the elements in the Periodic Table are forged in the massive stellar furnaces and during their catastrophic explosions. The elements produced are spread throughout the galaxy and are eventually recycled into new stars in red emission nebulae. Our solar system is the product of this stellar recycling process. All of the elements in our bodies were produced and dispersed in the distant past during the explosion of earlier generations of massive stars.
The imaging data used to construct my Flickr photo was gathered using T21 astrograph at iTelescope facility at Mayhill, NM at the New Mexico Skies Observatories. T21 is a remotely controlled robotic telescope and camera that is controlled over the Internet by authorized iTelescope members. T21 is PlaneWave CDK17 431 mm (17”) diameter telescope with a photographic speed of f/4.5. T21 has a Finger Lakes Instruments FLI-P6303E Monochrome CCD Camera attached to it. Astrodon color filters are sequentially inserted in front of the camera to capture data for different portions of the visible spectrum. The Flickr photo above is a composite of wideband Luminance, Red, Green, Blue, and narrowband Hydrogen-alpha filter data gathered by T21. A total of 6.9 hours of imaging data (1.9 gigabytes) from NGC 6888 shared among the five different filters was used to construct the Flickr image.
The data from T21 was download to my home computer via the Internet. The dedicated astroimaging software Astro Pixel Processor (APP) was used to preprocess and postprocess the data to produce the final composite color image shown above. Adobe Photoshop 2021 was used to make final tweaks to the color, saturation, and contrast of the APP produced image.
This picture was kindly provided by Jason Kridner.
The people from BeagleBoard.org/brief were so kind to boot angstrom on their prototypes:
Texas Instruments X-Loader 1.41
Starting on with MMC
Reading boot sector
153968 Bytes Read from MMC
Starting OS Bootloader from MMC...
U-Boot 1.1.4 (Mar 12 2008 - 01:54:38)
OMAP3430-GP rev 2, CPU-OPP2 L3-133MHz
TI 3430Beagle 2.0 Version + mDDR (Boot ONND)
DRAM: 128 MB
Flash: 0 kB
NAND:256 MiB
In: serial
Out: serial
Err: serial
Audio Tone on Speakers ... complete
Hit any key to stop autoboot: 3 0
OMAP3 beagleboard.org # run bootmmc
1655384 bytes read
3145728 bytes read
OMAP3 beagleboard.org # boot
## Booting image at 80300000 ...
Image Name: Linux-2.6.22.1-omap1
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1655320 Bytes = 1.6 MB
Load Address: 80008000
Entry Point: 80008000
Verifying Checksum ... OK
OK
Linux version 2.6.22.1-omap1 (root@lta0199630c.am.dhcp.ti.com) (gcc version 4.2.0 20070413 (prerelease) (CodeSourcery Sourcery G++ Lite 2007q1-21)) #7 Tue Mar 11 22:40:08 CDT 2008
CPU: ARMv7 Processor [411fc082] revision 2 (ARMv7), cr=00c5387f
Machine: OMAP3 Beagle board
Memory policy: ECC disabled, Data cache writeback
OMAP3430ES1
SRAM: Mapped pa 0x40200000 to va 0xd7000000 size: 0x100000
CPU0: D VIPT write-through cache
CPU0: cache: 768 bytes, associativity 1, 8 byte lines, 64 sets
Built 1 zonelists. Total pages: 32512
Kernel command line: console=ttyS2,115200n8 noinitrd root=/dev/mmcblk0p1 rw rootfstype=ext3 rootdelay=3
GPMC revision 5.0
IRQ: Found an INTC at 0xd8200000 (revision 4.0) with 96 interrupts
Total of 96 interrupts on 1 active controller
OMAP34xx GPIO hardware version 2.5
PID hash table entries: 512 (order: 9, 2048 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 128MB 0MB = 128MB total
Memory: 126336KB available (3068K code, 285K data, 128K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
twl4030: I2C Client[3] is not initialized[510]
twl4030: I2C Client[3] is not initialized[459]
SmartReflex driver initialized
OMAP DMA hardware revision 4.0
DMA 1
DMA 2
DMA 3
DMA 4
DMA 5
DMA end
DSS getting initialized
DSS 2
DSS 3
OMAP Display hardware version 2.0
i2c_omap i2c_omap.1: bus 1 rev3.12 at 2600 kHz
i2c_omap i2c_omap.2: bus 2 rev3.12 at 100 kHz
i2c_omap i2c_omap.3: bus 3 rev3.12 at 400 kHz
TWL4030: TRY attach Slave TWL4030-ID0 on Adapter OMAP I2C adapter [1]
TWL4030: TRY attach Slave TWL4030-ID1 on Adapter OMAP I2C adapter [1]
TWL4030: TRY attach Slave TWL4030-ID2 on Adapter OMAP I2C adapter [1]
TWL4030: TRY attach Slave TWL4030-ID3 on Adapter OMAP I2C adapter [1]
TWL4030 Power Companion Active
TWL4030: Driver registration complete.
TWL4030 GPIO Demux: IRQ Range 376 to 386, Initialization Success
SCSI subsystem initialized
NET: Registered protocol family 23
Time: 32k_counter clocksource has been installed.
Switched to high resolution mode on CPU 0
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
Power Management for TI OMAP.
prcm_init .... entered
prcm_init .... completed
create_proc_entry succeeded
create_proc_entry succeeded
NetWinder Floating Point Emulator V0.97 (double precision)
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
timeout waiting for frame-done interrupt
omap24xxfb: Options ""
Console: switching to colour frame buffer device 128x48
omap24xxfb: fb0 frame buffer device
omap24xxfb: display mode 1024x768x16 hsync 5kHz vsync 7Hz
OMAP Watchdog Timer Rev 0x31: initial timeout 60 sec
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250.0: ttyS0 at MMIO 0x4806a000 (irq = 72) is a ST16654
serial8250.0: ttyS1 at MMIO 0x4806c000 (irq = 73) is a ST16654
serial8250.0: ttyS2 at MMIO 0x49020000 (irq = 74) is a ST16654
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: module loaded
USB charging started.
OMAP IrDA driver initializing
Linux video capture interface: v2.00
omap24xxvout: registered device video1 [v4l2]
omap24xxvout: registered device video2 [v4l2]
i2c /dev entries driver
OMAP HDQ Hardware Revision 0.5. Driver in interrupt mode.
Advanced Linux Sound Architecture Driver Version 1.0.14 (Thu May 31 09:03:25 2007 UTC).
TWL4030 Audio Support: Chip Rev[0x2f] Initialized
Chip Rev[0x2f] Initialized
audio support initialized
ALSA device list:
#0: TWL4030
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 15
IrCOMM protocol (Dag Brattli)
implementor 41 architecture 3 part 30 variant c rev 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Waiting 3sec before mounting root device...
mmc0: host does not support reading read-only switch. assuming write-enable.
mmcblk0: mmc0:ceb9 SM02G 1967616KiB
kjournald starting. Commit interval 5 seconds
EXT3-fs warning: maximal mount count reached, running e2fsck is recommended
internal journal
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem).
Freeing init memory: 128K
INIT: version 2.86 booting
Starting the hotplug events dispatcher udevd
Synthesizing the initial hotplug events
Remounting root file system...
root: mount: mount point /proc/bus/usb does not exist
Setting up IP spoofing protection: rp_filter.
Configuring network interfaces... modprobe: FATAL: Could not load /lib/modules/2.6.22.1-omap1/modules.dep: No such file or directory
ifconfig: SIOCGIFFLAGS: No such device
modprobe: FATAL: Could not load /lib/modules/2.6.22.1-omap1/modules.dep: No such file or directory
eth0 No such device
modprobe: FATAL: Could not load /lib/modules/2.6.22.1-omap1/modules.dep: No such file or directory
udhcpc: SIOCGIFINDEX: No such device
done.
Starting portmap daemon: portmap.
hwclock: can't open '/dev/misc/rtc': No such file or directory
Checking for built-in Bluetooth: no
Starting to configure packages...
Configuring avahi-autoipd
Configuring avahi-daemon
Adding system startup for /etc/init.d/avahi-daemon.
Configuring dbus-1
Adding system startup for /etc/init.d/dbus-1.
Configuring ppp
Configuring ppp-dialin
Configuring update-modules
WARNING: Couldn't open directory /lib/modules/2.6.22.1-omap1: No such file or directory
FATAL: Could not open /lib/modules/2.6.22.1-omap1/modules.dep.temp for writing: No such file or directory
Finished to configure packages.
INIT: Entering runlevel: 5
Creating Dropbear SSH server RSA host key.
Will output 1024 bit rsa secret key to '/etc/dropbear/dropbear_rsa_host_key'
Generating key, this may take a while...
Public key portion is:
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgwCRB0DVyCxub1TXpoePk5OXpnSzzW5Tw5yaQNaFH6dc8zy2hO8TUqwA6u5b1+6sQh/Y+Gso9lpmGaZZankeca3e97uidi6blc+Gst9Wg/CjMoFHoUq1ewk6Ao2aRVyPk/ZCW9qYMrTf9Y7rNfMZOb9LtOX14zds+WOQgg9C9Xe5l2ml root@beagleboard
Fingerprint: md5 cf:72:48:c2:49:77:b6:c5:6d:3a:31:15:b4:4a:3e:8b
Starting Dropbear SSH server: modprobe: FATAL: Could not load /lib/modules/2.6.22.1-omap1/modules.dep: No such file or directory
dropbear.
modprobe: FATAL: Could not load /lib/modules/2.6.22.1-omap1/modules.dep: No such file or directory
Starting advanced power management daemon: No APM support in kernel
(failed.)
Starting system message bus: dbus.
Starting syslogd/klogd: done
* Starting Avahi mDNS/DNS-SD Daemon: avahi-daemon
...done.
Starting Bluetooth subsystem: hcid hid2hci.
Opening scene
It is late in the 22nd Century. United Planet cruiser C57D a year out from Earth base on the way to Altair for a special mission. Commander J.J Adams (Leslie Neilsen) orders the crew to the deceleration booths as the ship drops from light speed to normal space.
Adams orders pilot Jerry Farman (Jack Kelly) to lay in a course for the fourth planet. The captain then briefs the crew that they are at their destination, and that they are to look for survivors from the Bellerophon expedition 20 years earlier.
As they orbit the planet looking for signs of life, the ship is scanned by a radar facility some 20 square miles in area. Morbius (Walter Pigeon) contacts the ship from the planet asking why the ship is here. Morbius goes on to explain he requires nothing, no rescue is required and he can't guarantee the safety of the ship or its crew.
Adams confirms that Morbius was a member of the original crew, but is puzzled at the cryptic warning Morbius realizes the ship is going to land regardless, and gives the pilot coordinates in a desert region of the planet. The ship lands and security details deploy. Within minutes a high speed dust cloud approaches the ship. Adams realizes it is a vehicle, and as it arrives the driver is discovered to be a robot (Robby). Robby welcomes the crew to Altair 4 and invites members of the crew to Morbious residence.
Adams, Farman and Doc Ostrow (Warren Stevens) arrive at the residence and are greeted by Morbius. They sit down to a meal prepared by Robbys food synthesizer and Morbius shows the visitors Robbys other abilities, including his unwavering obedience. Morbius then gives Robby a blaster with orders to shoot Adams. Robby refuses and goes into a mechanical mind lock, disabling him till the order is changed.
Morbius then shows the men the defense system of the house (A series of steel shutters). When questioned, Morbius admits that the Belleraphon crew is dead, Morbius and his wife being the only original survivors. Morbius's wife has also died, but months after the others and from natural causes. Morbius goes on to explain many of the crew were torn limb from limb by a strange creature or force living on the planet. The Belleraphon herself was destroyed when the final three surviving members tried to take off for Earth.
Adams wonders why this force has remained dormant all these years and never attacked Morbius. As discussions continue, a young woman Altaira (Anne Francis) introduces herself as Morbius daughter. Farman takes an immediate interest in Altaira, and begins to flirt with her . Altaira then shows the men her ability to control wild animals by petting a wild tiger. During this display the ship checks in on the safety of the away party. Adams explains he will need to check in with Earth for further orders and begins preparations for sending a signal. Because of the power needed the ship will be disabled for up to 10 days. Morbius is mortified by this extended period and offers Robby's services in building the communication facility
The next day Robby arrives at ship as the crew unloads the engine to power the transmitter. To lighten the tense moment the commander instructs the crane driver to pick up Cookie (Earl Holliman) and move him out of the way. Quinn interrupts the practical joke to report that the assembly is complete and they can transmit in the morning.
Meanwhile Cookie goes looking for Robby and organizes for the robot to synthesize some bourbon. Robby takes a sample and tells Cookie he can have 60 gallons ready the next morning for him.
Farman continues to court Altair by teaching her how to kiss, and the health benefits of kissing. Adams interrupts the exercise, and is clearly annoyed with a mix of jealous. He then explains to Altair that the clothes she wears are inappropriate around his crew. Altair tries to argue till Adams looses patience and order Altair to leave the area.
That night, Altair, still furious, explains to her father what occurred. Altair takes Adams advice to heart and orders Robby to run up a less revealing dress. Meanwhile back at the ship two security guards think they hear breathing in the darkness but see nothing.
Inside the ship, one of the crew half asleep sees the inner hatch opened and some material moved around. Next morning the Captain holds court on the events of the night before. Quinn advises the captain that most of the missing and damaged equipment can be replaced except for the Clystron monitor. Angry the Capt and Doc go back to Morbius to confront him about what has occurred.
Morbius is unavailable, so the two men settle in to wait. Outside Adams sees Altair swimming and goes to speak to her. Thinking she is naked, Adams becomes flustered and unsettled till he realizes she wants him to see her new dress. Altair asks why Adams wont kiss her like everyone else has. He gives in and plants one on her. Behind them a tiger emerges from the forest and attacks Altair, Adams reacts by shooting it. Altair is badly troubled by the incident, the tiger had been her friend, but she can't understand why acted as if she was an enemy.
Returning to the house, Doc and Adams accidently open Morbius office. They find a series of strange drawings but no sign of Morbius. He appears through a secret door and is outraged at the intrusion. Adams explains the damage done to the ship the previous night and his concern that Morbius was behind the attack.
Morbius admits it is time for explanations. He goes on to tell them about a race of creatures that lived on the planet called the Krell. In the past they had visited Earth, which explains why there are Earth animals on the planet. Morbius believes the Krell civilization collapsed in a single night, right on the verge of their greatest discovery. Today 2000 centuries later, nothing of their cities exists above ground.
Morbius then takes them on a tour of the Krell underground installation. Morbius first shows them a device for projecting their knowledge; he explains how he began to piece together information. Then an education device that projects images formed in the mind. Finally he explains what the Krell were expected to do, and how much lower human intelligence is in comparison.
Doc tries the intelligence tester but is confused when it does not register as high as Morbius. Morbius then explains it can also boost intelligence, and that the captain of the Belleraphon died using it. Morbius himself was badly injured but when he recovered his IQ had doubled.
Adams questions why all the equipment looks brand new. It is explained that all the machines left on the planet are self repairing and Morbius takes them on a tour of the rest of the installation. First they inspect a giant air vent that leads to the core of the planet. There are 400 other such shafts in the area and 9200 thermal reactors spread through the facilities 8000 cubic miles.
Later that night the crew has completed the security arrangements and tests the force field fence. Cookie asks permission to go outside the fence. He meets Robby who gives him the 60 gallons of bourbon. Outside, something hits the fence and shorts it out. The security team checks the breach but finds nothing. A series of foot like depressions begin forming leading to the ship. Something unseen enters the ship. A scream echos through the compound.
Back at the Morbius residence he argues that only he should be allowed to control the flow of Krell technology back to Earth. In the middle of the discussion, Adams is paged and told that the Chief Quinn has been murdered. Adams breaks of his discussions and heads back to the ship.
Later that night Doc finds the footprints and makes a cast. The foot makes no evolutionary sense. It seems to have elements of a four footed and biped creature; also it seems a predator and herbivore. Adams questions Cookie who was with the robot during the test and decides the robot was not responsible.
The next day at the funeral for Chief Morbius again warns him of impending doom facing the ship and crew. Adams considers this a challenge and spends the day fortifying the position around the ship. After testing the weapons and satisfied all that could be done has, the radar station suddenly reports movement in the distance moving slowly towards the ship.
No one sees anything despite the weapons being under radar fire control. The controller confirms a direct hit, but the object is still moving towards the ship. Suddenly something hits the force field fence, and a huge monster appears outlined in the energy flux. The crew open fire, but seem to do little good. A number of men move forward but a quickly killed.
Morbious wakes hearing the screams of Altair. Shes had a dream mimicking the attack that has just occurred. As Morbious is waking the creature in the force field disappears. Doc theories that the creature is made of some sort of energy, renewing itself second by second.
Adams takes Doc in the tractor to visit Morbius intending to evacuate him from the planet. He leaves orders for the ship to be readied for lift off. If he and Doc dont get back, the ship is to leave without them. They also want to try and break into Morbious office and take the brain booster test.
They are met at the door by Robby, who disarms them. Altair appears and countermands the orders given to Robby by her father. Seeing a chance Doc sneaks into the office. Altair argues with Adams about trying to make Morbius return home, she ultimately declares her love for him.
Robby appears carrying the injured Doc. Struggling to speak and heavy pain, Doc explains that the Krell succeeded in their great experiment. However they forgot about the sub conscious monsters they would release. Monsters from the id.
Morbius sees the dead body of Doc, and makes a series of ugly comments. His daughter reminds him that Doc is dead. Morbius lack of care convinces Altair she is better off going with Adams. Morbius tries to talk Adams out of taking Altair.
Adams demands an explanation of the id. Morbius realizes he is the source of the creature killing everyone. The machine the Krell built was able to release his inner beast, the sub conscious monster dwelling deep inside his ancestral mind.
Robby interrupts the debate to report something approaching the house. Morbius triggers the defensive shields of the house, which the creature begins to destroy. Morbius then orders Robby to destroy the creature, however Robby short circuits. Adams explained that it was useless; Robby knew it was Morbius self.
Adams, Altair and Morbius retreat to the Krell lab and sealed themselves in by sealing a special indestructible door. Adams convinces Morbius that he is really the monster, and that Morbius can not actually control his subconscious desires.
The group watch as the creature beings the slow process of burning through the door. Panicked Morbius implores Altair to say it is not so. Suddenly the full realization comes, and he understands that he could endanger or even kill Altair.
As the creature breaks through Morbius rushes forward and denies its existence. Suddenly the creature disappears but Morbius is mortally wounded. With his dying breath he instructs Adams to trigger a self destruct mechanism linked to the reactors of the great machine. The ship and crew have 24 hours to get as far away from the planet as possible
The next day we see the ship deep in space. Robby and Altair are onboard watching as the planet brightens and is destroyed. Adams assures Altair that her fathers memory will shine like a beacon.
Calcrete paleosol capping Pleistocene limestone at Green Cay, offshore-northwestern San Salvador Island, eastern Bahamas.
The dominant paleosol type on San Salvador Island (& other Bahamian islands) consists of hard, reddish-brown to orangish-brown colored, irregularly-sculpted crusts. These are referred to as calcretes or caliches or terra rosas. Calcrete paleosols cap all of the Pleistocene-aged stratigraphic units, except where removed by erosion. The Holocene-aged units (Hanna Bay Member & North Point Member of the Rice Bay Formation) haven’t been around long enough to develop calcrete paleosols atop their outcrops.
The calcrete horizon shown above has been dated to 9.2 ka (early Holocene). It caps a Pleistocene limestone unit that is probably the Owl's Hole Formation, according to John Mylroie.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Hanna Bay Member of the upper Rice Bay Formation at Grotto Beach. This is the youngest bedrock unit on San Salvador Island.
These well-sorted limestones consist of sand-sized grains of aragonite (CaCO3). On the continents, many quartz sandstones are technically called quartz arenites. Because the sand grains making up these Bahamian rocks are calcareous (composed of calcium carbonate), the limestones are called calcarenites. When examined microscopically, the calcareous sand grains can be seen touching each other - the rock is grain-supported. This results in an alternative name for these Bahamian limestones - grainstones. “Calcarenite” seems to be a more useful, more thoroughly descriptive term for these particular rocks, so I use that, versus “grainstone” (although “calcarenitic grainstone” could be used as well). The little-used petrologic term aragonitite could also be applied to these aragonitic limestones.
Hanna Bay Member limestones are more or less planar-bedded, and gently dip toward the modern ocean. The seaward dip, the sorting, the occurrence of more coarse-grained, finely fragmented seashell horizons, plus preserved sedimentary structures on some bedding planes such as bubble porosity and swash lines, indicate that these Hanna Bay Member rocks represent beach deposits. At other localities, the Hanna Bay Member includes back beach dune facies.
At the locality shown above (Grotto Beach), the lithified beach deposits are exposed two meters above current, mean sea level. Some geologists have taken this as evidence for a mid-Holocene highstand, and that modern sea level is lower than it was during portions of the mid-Holocene. A similar conclusion has been reached based on geologic evidence from elsewhere in the New World and the Old World. Recent work on this very Hanna Bay Member outcrop has thrown doubt on the validity of the mid-Holocene highstand interpretation (Savarese & Hoeflein, 2012).
The aragonite sand grains in the Hanna Bay Member are principally bioclasts (worn mollusc shell fragments & coral skeleton fragments & calcareous algae fragments, etc.) and peloids (tiny, pellet-shaped masses composed of micrite/very fine-grained carbonate - some are likely microcoprolites, others are of uncertain origin).
Age: Holocene (MIS 1)
Locality: shoreline outcrop along the southwestern margin of Grotto Bay, southwestern San Salvador Island, eastern Bahamas
------------------
Reference cited:
Savarese, M. & F.J. Hoeflein. 2012. Sea level and the paleoenvironmental interpretation of the middle to upper Holocene Hanna Bay Limestone, San Salvador, Bahamas: a high foreshore setting without a higher-than-present eustatic highstand. pp. 163-183 in Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions.
---------------------------------------
The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
------------------------------
Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
--------------------
Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
--------------------
Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
------------------------------
San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
----------------------------
Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
----------------------------
The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
----------------------------
Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.
Joanna Fowler, a senior chemist and Director of the Radiotracer Chemistry, Instrumentation and Biological Imaging Program at Brookhaven National Laboratory, was awarded the National Medal of Science at a White House ceremony on October 7, 2009. She is one of nine researchers named by President Barack Obama to receive the nation’s highest award for lifetime achievement in science.
Fowler has been a major contributor to brain research and the study of diseases such as addiction, which she has studied using an imaging technique called positron emission tomography (PET). In 1976, Fowler and her colleagues synthesized 18F-fluorodeoxyglucose (FDG), a radiotracer used in PET. Today, FDG is widely used in hospitals and research centers throughout the world to diagnose and study neurological and psychiatric diseases and to diagnose cancer.
A 1963 oddity from Bell Labs. (This is a single-sided 7-inch, about five minutes long—not an LP.)
A mellifluous announcer introduces us to some early, very raspy synthesized speech—created by feeding punch cards into some hulking IBM mainframe. Most notable is the finale where the computer sings "Daisy, Daisy"—a demonstration which so impressed IBM visitor Arthur C. Clarke that he worked it into the scene in 2001 where HAL 9000 gets deactivated.
In 2009 this recording became one of only 400 (so far) inducted into the Library of Congress's National Recording Registry. A version of the same recording with most of the announcer's introductions edited out is the last item on this page.
The New Fantastic Four
18th March– 5th April 2010
Private View Thursday 18th March 6:00 – 9:00 pm
First Thursdays 1 April 6:00 – 9:00 pm
Directed by Daphné Polski
COME DOWN IN YOUR SUPER-HERO COSTUME AND YOU WILL GET A FREE “NEW FANTASTIC 4” COMIC BOOK
After foiling the Dastardly Taco Mans plan, The Fantastic 4 Street Artists are re-united and the diaphanous dragonfly Daphné leads them to Pure Evil’s underground fortress.. Who knows what lurks beneath the streets of darkest east Londinium ? … To be continued......................................... at Pure Evil Gallery
Featuring:
REMED aka Giulo aka “The Re-illusionist”
" Remed takes every style past its due date and makes it fresh. Art Nouveau and "Free to be You and Me" graphics of the seventies are made strikingly contemporary. If you were to synthesize into a single body of work, the "New Image" of the early eighties with the graffiti writers who entered the New York art world around the same time. . . . Remed would emerge. Experienced with a limited time frame for execution, Remed solves color interactions quickly and accurately. The English language is manipulated with formidable typographic skill and a vicious sense of style. You know Remed is special when you see his transmutation of the curved arms of the French avant-garde. He's paid his dues, he's dubbing over history. "
Brooklynite gallery NY
GREMS aka “Captain Orgasmo”
An artist with multiple facets from graffiti artist to graphic designer, rapper, producer, brand director, autodidact…
A graduate of the “Beaux Arts” in Bordeaux, Grems exhibited worldwide: Georges Pompidou in Paris, Laboratori Arte Alameda in Mexico, Galerie Parcour in Pekin… and then turned to graphics.
In 2007, he produced the campaign “Imagin R” for the RATP; collaborated with prestigious brands such as Nike, Artoyz, Oxbow and Six Pack… and did the front covers of Graffiti Art and l’Humanité magazines. Then, in 2009, he created two watches for the Swatch collection as well as the watch for the Club Swatch limited edition.
Grems has been recently published by edition populaire (Just after BomK, Gutter and Dran)
3TTMAN aka “The Thing”
His spontaneous, painterly style has affinities with traditional painters, cartoons and everything that surrounds him in his everyday life, combining bold compositions and often garish colours with sometimes brutal imagery.
His name derives from the French trois têtes man, or three headed man – a recurring figure in his work, which reflects a divided, often directly contradictory spirit. What he portrays, is not just the good/evil or ugly/beautiful inside battle, but the human behaviour imbalance and complexity in its whole staged by this simple character, often using an ironic or even humoristic style not to fall in fatalism. Londoners will recognise his work from the huge piece he did on the front of the Tate Museum in 2008.
ZBIOK aka Sławomir Czajkowski aka “Road-Runner”
Zbiok`s works are rooted in street art. It is a painting with a profound message – the artist takes part in the dispute concerning problems of the modern world in the global sense. He has developed a style that is both recognisable and convincing. Czajkowski feels at ease in the realm of signs and symbols of popular culture. He can use them and process them for his own purposes, conscoiusly and creatively.
And with the collaboration of PURE EVIL aka ‘Taco Man’
4 free-minded artists, who enjoy playing with texts and colourful characters create a new form of Art expression, with echoes of “the automatic writing” techniques developed by the surrealists.
TAKING BACK THE STREETS ONE WALL AT TIME.
Fluoritized fossiliferous limestone from Illinois, USA. (field of view ~6.3 cm across)
Purple = fluorite (CaF2)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are about 5400 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The halides are the "salt minerals", and have one or more of the following anions: Cl-, F-, I-, Br-.
Fluorite is a calcium fluoride mineral (CaF2). The most diagnostic physical property of fluorite is its hardness (H≡4). Fluorite typically forms cubic crystals and, when broken, displays four cleavage planes (also quite diagnostic). When broken under controlled conditions, the broken pieces of fluorite form double pyramids. Fluorite is a good example of a mineral that can be any color. Common fluorite colors include clear, purple, blue, green, yellow, orange, and brown. The stereotypical color for fluorite is purple. Purple is the color fluorite "should be". A mineral collector doesn't have fluorite unless it's a purple fluorite (!).
Fluorite occurs in association with some active volcanoes. HF emitted from volcanoes can react with Ca-bearing rocks to form fluorite crystals. Many hydrothermal veins contain fluorite. Much fluorite occurs in the vicinity of southern Illinois (Mississippi Valley-type deposits).
The rock shown above is from a Mississippi Valley-type deposit in southern Illinois. Commonly abbreviated "MVT", Mississippi Valley-type deposits are named for a series of mineral deposits that occur in non-deformed platform sedimentary rocks along the Upper Mississippi River Valley, USA. Many specific minerals occur in MVT deposits, but are dominated by galena, sphalerite, barite, and fluorite. These minerals occur in caves and karst, paleokarst structures, in collapse fabrics, in pull-apart structures, etc. MVT deposits in America are mined as important, large sources of lead ore and zinc ore. The classic areas for MVT deposits are southern Illinois, the tristate area of Oklahoma-Missouri-Kansas, northern Kentucky, southwestern Wisconsin, and southeastern Missouri. The minerals are hydrothermal in origin and were precipitated from basinal brines that were flushed out to the edges of large sedimentary basins (e.g., the Illinois Basin and the Black Warrior Basin). In basin edge areas, the brines came into contact with Mississippian-aged carbonate rocks (limestone and dolostone), which caused mineralization. The brines were 15% to 25% salinity with temperatures of 50 to 200 degrees Celsius (commonly 100 to 150 degrees C). MVT mineralization usually occurs in limestone and dolostone but can also be hosted in shales, siltstones, sandstones, and conglomerates. Gangue minerals include pyrite, marcasite, calcite, aragonite, dolomite, siderite, and quartz. Up to 40 or 50 pulses of brine fluids are recorded in banding of mineral suites in MVT deposits (for example, sphalerite coatings in veins have a stratigraphy - each layer represents a pulse event). Each pulse of water was probably expelled rapidly - overpressurization and friction likely caused the water to heat up. Some bitumen (crystallized organic matter) can occur, which is an indication of the basinal origin of the brines. The presence of asphalt-bitumen indicates some hydrocarbon migration occurred. Some petroleum inclusions are found within fluorite crystals and petroleum scum occurs on fluorite crystals. MVT deposits are associated with oil fields and the temperature of mineral precipitation matches the petroleum window. The brines may simply have accompanied hydrocarbon fluids as they migrated updip.
The high temperatures of these basin periphery deposits wasn't necessarily influenced by igneous hydrothermal activity. Hot fluids can occur in basins that are deep enough for the geothermal gradient to be ~100 to 150 degrees Celsius. If a permeable conduit horizon is present in a succession of interbedded siliciclastic sedimentary rocks, migration of hot, deep basinal brines may be quick enough to get MVT deposit conditions at basin margins.
MVT deposits occur in the Upper Mississippi Valley of America as well as in northern Africa, Scandinavia, northwestern Canada, at scattered sites in Europe, and at some sites in the American Cordillera. Some of these occurrences are in deformed host rocks. MVT deposits have little to no precious metals - maybe a little copper (Cu). Mineralization is usually associated with limestone or dolostone in fracture fillings and vugs. Little host rock alteration has occurred - usually only dolomitization of limestones.
The age of the host rocks in the Mississippi Valley area varies - it ranges from Cambrian to Mississippian. Dating of mineralization has been difficult, but published ages indicate a near-latest Paleozoic to Mesozoic timing.
MVT deposits in the Upper Mississippi River area are often divided into three subtypes based on the dominant mineral: 1) lead-rich (galena dominated); 2) zinc-rich (sphalerite dominated); and 3) fluorite rich.
The fluoritized limestone shown above is from the Illinois-Kentucky Fluorspar District ("fluorspar" is a very old name for fluorite), which is an MVT fluoritic subtype. Fluorite and fluorite-rich rocks are mined for the fluorine, which is principally used by the chemical industry to make HF - hydrofluoric acid.
The non-fluorite portion of the rock is Mississippian fossiliferous limestone, apparently derived from the Levias Member of the Ste. Genevieve Limestone (Middle to Upper Mississippian) or from the Renault Limestone (Upper Mississippian). Fluorite mineralization occurred at about 277 Ma, during the Early Permian, according to one published study (Chesley et al., 1994). Another study concluded that fluorite mineralization was much later, during the Late Jurassic (see Symons, 1994).
Locality: Hastie Quarry (eastern mine of the Hastie property) (= former Lead Mine & Cleveland Mine & Green-Defender Mine), ~3.5 to 4 air-miles northwest of the town of Cave-in-Rock, southeastern Hardin County, far-southern Illinois, USA
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Photo gallery of fluorite:
www.mindat.org/gallery.php?min=1576
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Some info. on Mississippi Valley-type deposits was synthesized from:
Chesley et al. (1994) - Direct dating of Mississippi Valley-type mineralization: use of Sm-Nd in fluorite. Economic Geology 89: 1192-1199.
Symons (1994) - Paleomagnetism and the Late Jurassic genesis of the Illinois-Kentucky fluorspar deposits. Economic Geology 89: 438-449.
Rakovan (2006) - Mississippi Valley-type deposits. Rocks & Minerals 81(January/February 2006): 69-71.
Fisher et al. (2013) - Fluorite in Mississippi Valley-type deposits. Rocks & Minerals 88(January/February 2013): 20-47.
Very interesting!
Sorry for the poor quality image... It was difficult to focus on this Weatern Horse Lubber grasshopper dining on the apple core in the fresh addition to my compost pile under a large grapefruit tree... This is included because it is so interesting. I didn't know grasshoppers eat fruit...;))
I have forgotten the name of the other insect also dining on the apple...
Western Horse Lubber Grasshopper: Taeniopoda eques or T. Eqes.
Central District, Dufy Neighborhood, Tucson, AZ.
9-4-11.
Photo By: Chic Bressel.
OK, It is Taeniopoda eques or T. Eqes
From Wikepedia:
en.wikipedia.org/wiki/Taeniopoda_eques
Taeniopoda eques
The western horse lubber grasshopper, Taeniopoda eques, is a relatively large grasshopper species of the Romaleidae family found in the arid lower Sonoran life zone of the southwestern United States and Northern Mexico. [1] Northern populations are identifiable by their shiny black bodies and black and yellow reticulated forewings. Some southern populations are yellow in the adult stage. The species is unique in using its black coloration to thermoregulate and in being chemically defended. The aposematic coloration warns vertebrate predators of its unpalatability and allows the grasshopper to roost conspicuously upon desert shrubs.
Taeniopoda eques
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Orthoptera
Superfamily: Acridoidea
Family: Romaleidae
Subfamily: Romaleinae
Genus: Taeniopoda
Species: T. eques
Binomial name
Taeniopoda eques
Burmeister, 1838
Etymology
T. eques was first described by Burmeister in 1838. [4] The vernacular lubber refers to the flightless terrestrial status of the Romaleinae subfamily. [3] Eques is the Latin term for “horseman”. [5]
Description
T. eques is one of the largest grasshopper species in North America. A female of the species can reach 7 centimeters long and weigh 9 grams. The mature male weighs 3 grams on average. [2]There is a wide range of sizes due to influences in its specific habitat. [1] Males stridulate more commonly than females by expanding the hind wings against the closed forewings, thus flashing the bright red hindwings. [2] It is unique among desert grasshoppers because of its conspicuous size and coloring. The body is mostly black, with finely patterned black and yellow forewings with green veins and red hindwings with black borders. The antennae and head of the adult include orange markings. The forewings of males normally extend past the tip of the abdomen. [6] However, most T. eques cannot fly, with only approximately 10 percent of males possessing wings long enough for flight. [7] The T. eques nymph resembles the adult in coloration, except the nymph also possesses yellow head markings and black antennae. [1]
Distribution and Habitat
T. eques ranges from Southern Arizona, New Mexico, and Texas to Central Mexico, and inhabits the lower Sonoran life zone, which consists primarily of sparse desert brush and grasslands. It can be found among Acacia, Mimosa, Ephedra, and Yucca shrubs. In the United States, this grasshopper species is the only member of its genus (Taeniopoda) and one of the largest arthropods. In the United States, it inhabits the Chihuahuan Desert community from southern Arizona to the Big Bend region of Texas. [2] [8] The Chihuahuan Desert receives a high amount of summer precipitation compared to other deserts, which is necessary for the grasshopper’s development. [1]
Diet
T. eques does not feed on the same plants it roosts on. In an experiment, it was found to be unable to survive on Acacia and Mimosa shrubs alone. It feeds mainly on foliage, flowers, and seed pods of low-growing summer desert annuals. T. eques only forages during daylight hours and at night it roosts near the tops of desert shrubs to hide from nocturnal ground predators. At dawn, it descends to the desert floor to feed upon the different annual species which are abundant following summer rains. T. eques drink free-standing water from raindrops. [3][6][2] T. eques is known to be polyphagous, and also consumes a variety of other material, including spider silk and feces. It is an opportunistic carnivore and can occasionally be found scavenging for insect and vertebrate cadavers. Odors can be detected to find both mammal and insect carcasses, which may provide a source of protein and nitrogen in the diet. The female is more likely engage in scavenger behavior than the male T. eques. This difference may be explained by the female’s greater need for protein and other nutrients to facilitate more rapid maturation and egg production. Cannibalism has been observed upon molting or incapacitated individuals of its own species. [9]
Life Cycle
T. eques is univoltine, producing only one brood of offspring per year. Females lay eggs at the base of shrubs or large rocks, depositing the approximately 50 eggs in a single pod 4-8 centimeters deep into the soil. The females also eject a liquid with the eggs, which dries and forms a hard case protecting the egg pod. In the United States, eggs are deposited in subterranean egg pods in October. The number of egg pods laid is dependent upon the rate of development in the adults and the time available before the frost sets in. The grasshoppers reach maturity in October and die in November during the winter freeze. [2] Thermoregulation is necessary for speeding the development of T. eques to increase its reproductive chances before the favorable growing season ends. [7]
Along with the onset of the summer rainy season, the young hatch in synchrony from subterranean egg pods in July. The larvae are especially vulnerable to predatory ants for about the first 3 minutes after hatching. After shedding the provisional cuticle, the larvae climb up the nearest vertical object. They are born reddish in color, but transform to black within 2 hours. [2]
Despite of its large size, T. eques has a relatively speedy rate of larval development, undergoing 5 nymphal molts to reach the adult stage in about 40 days. Recently molted individuals are brown but darken within 2 hours at warm temperatures. Temperature influences whether they can complete the molting process. At temperatures less than 25°C, molting is usually not initiated. At temperatures above 36°C, they can become stuck in old exoskeletons. Individuals are exposed to predation and sibling [cannibalism_zoology|cannibalism] during molting. T. eques is different from other aposematic grasshoppers in its asynchronous molting. [2]
Mating begins about 12 days after maturity, and about 30 days after the adults molt, females begin laying egg pods each containing about 50 eggs. Egg pods are deposited 6 to 9 centimeters underground. Females continue to lay subsequent egg pods at 18 day intervals until they are killed by the freeze in November. [2]
Behavior
Thermoregulation
Thermoregulation is necessary for all essential life functions of T. eques and most other behaviors, including food consumption and digestion, predator escape, reproduction, walking, flying, and ovipositing. The desert environment of T. eques is often unpredictable and allows the grasshopper only about four months, the time between the onset of the summer rains and the arrival of the winter freeze, to complete its entire life cycle. Growth and development are further slowed by cold desert nights, and in October, cold days. T. eques speed development by solar basking, aided by its black heat-absorbing coloration. By thermoregulating, the grasshopper can maintain an optimal body temperature between 30 to 40 degrees Celsius for most of the day. Elevating body temperature for extended periods allows T. eques to metabolize faster, thus permitting maximum growth and reproduction before the onset of winter. [7] [10]Without thermoregulation, T. eques could not survive in its northern range. [7]
The unique black coloration of T. eques is thermally beneficial, contributing to the species’ shorter larval development time compared to the light- colored desert grasshoppers. T. eques has also developed behavioral thermoregulatory mechanisms for sunlight exposure. Flanking occurs when the grasshopper orients its body perpendicular to sunlight, maximizing thoracic heat gain. The sun-side hind leg is lowered, the shade-side hind leg is raised, and the abdomen is lowered to reduce wing shading. Moving into the centers of bushes allows for shading to limit sun exposure at midday to prevent overheating. [7][2]
Defense
Ants regularly attack hatching and molting nymphs. Vertebrates sharing the habitat of T. eques rarely disturb lubbers and prefer other lubber grasshopper species instead. Only invertebrates and grasshopper mice have been shown to be undeterred by adult T. eques defenses. [2]
T. eques possesses a multi-sensory defense system. The chemical secretion has a strong coffee-vanilla odor and composed of a complex mixture of synthesized phenolics and plant toxins produced from the grasshopper’s diet. [2] When consumed, the toxic tissues of T. eques cause vomiting or death in predators. [11] The species relies on a comprehensive aposematic display containing chemical deterrents, and visual and auditory elements for defense against vertebrate predators. [6] For example, when attacked by mice, the grasshoppers spray the odorous secretion from their metathoracic spiracles while producing a hissing noise. The secretion surrounds the insect in a noxious deterrent cloud. Adults also turn sideways to predators and display their bright red hind wings while waving their bright antennae and spiny hind legs in a threatening manner. Together these signals warn naïve predators and remind experienced predators of the grasshopper’s toxicity. [11][2]
Social Behavior
In the first stage of life, pod mates aggregate and move and feed together, but disperse after a few days. Aggregation is tightest in this first instar period and may be a method of defense for the vulnerable developing grasshoppers. Thereafter they are solitary, although mature T. eques are attracted to the largest bush at dusk which provides the appearance of clumping. This behavior may provide benefits of increasing opportunities for mating and enhancing aposematic displays against predators. [2]
Sexual Behavior and Pheromones
Both sexes of mature T. eques engage in promiscuous behavior. Males are sexually aggressive, actively mounting females and males of the species as well as individuals from other grasshopper and lizard species. [2]
Males cautiously stalk females before suddenly mounting without any communicatory leg or wing signaling. Females react violently when mounted by jumping, kicking, running, and rotating from side to side [12] However, immediately following copulation, females become docile and carry males on their backs. Males do not guard ovipositing females. [2]
The female T. eques releases a pheromone that elicits male attraction and sexual behavior over a short distance. Male T. eques can remain in copulation for up to 24 hours, continuously passing spermatophores to the female.
Trait Interaction Multiple phenotypic traits interact in T. eques since chemical defense from vertebrates releases the species from the need to be small and hidden. Thus T. eques has evolved a large body size, to increase fecundity, deter small invertebrate predators, increase water retention, and allow for deep ovipositing. However, the large adult size requires long development and growth, which is difficult in its short season. It speeds growth by evolving thermoregulation mechanisms including dark color and solar exposure positions, both allowed only because of chemical defense. These features cause T. eques to be conspicuous; however, chemical deterrents protect it against predators. The species can allocate resources to reproduction instead of wings and flight muscles. As with many other chemically defended insects, T. eques is flightless and sluggish.
IMG_3065 - Version 2
New York Times
November 4, 1994
ARCHITECTURE REVIEW
Rem Koolhaas's New York State of Mind
By HERBERT MUSCHAMP
EW YORK CITY'S most inspiring architect lives in London, works in Rotterdam and has yet to build a thing on the North American continent. But for the next three months, Rem Koolhaas has the stage at the Museum of Modern Art, where New Yorkers can see for themselves how their city continues to shape the world even as their own architecture has slipped below world-class standards. Considering all the fanfare this show has generated, including lavish spreads in the fashion glossies, "O.M.A. at MOMA: Rem Koolhaas and the Place of Public Architecture" turns out to be relatively modest in scale. Confined to one top- floor gallery in the Modern's department of architecture and design, the show presents models and drawings for five projects designed in the last five years by Mr. Koolhaas and his Office for Metropolitan Architecture (O.M.A.). Three additional models, depicting urban plans, are displayed on the landing outside.
(Models for three private houses are on view in the museum's Education Center on the ground floor.)
But anticipation for this show, which was first scheduled to open more than a year ago, has been mounting for some time. And the hoopla is not incidental to the work on view. This is a show about buildings and cities, but it is also a show about aura: the aura of the city, the role buildings play in creating that aura and the glamour that occasionally surrounds an architect of promise, leading excitable critics to plunge recklessly overboard with extravagant words of praise.
Mr. Koolhaas, who was born in the Netherlands in 1944 and educated at the Architectural Association in London, first achieved public attention with the 1978 publication of his book "Delirious New York," an ecstatic love poem to Manhattan that challenged conventional thinking in urban design. While planners and urban designers struggled to bring logic, sanity and order to the built environment, Mr. Koolhaas argued that the glory of the city lies in the exceptional, the excessive, the extreme. A champion of what he called "the culture of congestion," Mr. Koolhaas viewed the Manhattan skyline as a kind of euphoric party, as if architecture had been squeezed vertically not by real- estate values but by the eagerness of people to get together on a small island and laugh it up.
Since that colorful debut, Mr. Koolhaas has accumulated an impressive body of built work, including apartment buildings in the Netherlands and Japan, the Netherlands Dance Theater in the Hague and the Kunsthal, an art exhibition center in Rotterdam. He has also pushed the limits of architecture with provocative designs for projects that so far remain unbuilt, like the Jussieu Library in Paris. But the achievement that has established him most solidly on the international map is Mr. Koolhaas's master plan for Euralille, a commercial project now nearing completion in northern France. Designed to exploit Lille's position as a major hub for Europe's high-speed trains, Euralille includes buildings by the architects Christian de Portzamparc and Jean Nouvel, in addition to a trade and convention center designed by Mr. Koolhaas.
These projects, too, display Mr. Koolhaas's enduring passion for New York: the glass-curtain-wall skyscrapers pioneered by Mies van der Rohe; the bustling street life of places like Times Square, where peril and pleasure jostle each other in a synergistic mix. But Mr. Koolhaas's most highly burnished New York touchstone is the work of the architect Wallace K. Harrison. Harrison, the subject of a show organized by Mr. Koolhaas in 1980 at the Institute for Architecture and Urban Studies in Manhattan, designed such fabled New York landmarks as the United Nations Headquarters, the Trylon and Perisphere at the 1939 New York World's Fair, and the Hall of Science at the 1964-65 World's Fair. For Mr. Koolhaas, these projects represent the ideal of an architecture at once modern and romantic; they defined an urban mythology for changing times.
Organized by Terence Riley, chief curator of the Modern's architecture and design department, the Koolhaas show was at one point scheduled to run concurrently with last season's mammoth show on Frank Lloyd Wright. The two would have made an illuminating pair, for Mr. Koolhaas's vision of the city is nearly the antithesis of Wright's. Wright, at the threshold of the automobile age, championed the centrifugal city, dispersed into the suburban landscape by the car, the highway and the romantic ideal of individual autonomy. Mr. Koolhaas stands, by contrast, for the centripetal city: for the urban center that, at the end of the century, continues to act as a cultural magnet and an incubator for ideas. Mr. Koolhaas's designs for archetypal urban institutions - - two libraries, a museum, a school, a marketplace -- are the core of the Modern's show.
On a certain level, these buildings are about coping. Mr. Riley writes in the exhibition brochure that Mr. Koolhaas and O.M.A "perceive the city as a survivor." Survivors are not victims. They have earned the right to set their own terms. Cities shouldn't be competing with the suburbs by trying to become more like them. They don't have to turn themselves into theme parks. They have better things to do than indulge the fear that their best days are behind them by encouraging architects to design new buildings that look old.
Mr. Koolhaas is undoubtedly right to question current urban shibboleths. But are the terms he proposes the right ones for the city today? Essentially, Mr. Koolhaas asks us to believe that spectacular public buildings, or spectacular groupings of them, contribute at least as much to the vitality of the city as do the systematic designs of urban planners. Those who crave urban life, he insists, want something more than safe, clean streets, trains that run and contextual design guidelines for new development. They're looking to be part of a legend in the making. Just as it is the business of music, film and physics to produce spectacular singers, directors and theorists, so it is the job of the city to produce wonderful, fabulous places: buildings we'd walk blocks out of our way to see.
This is an odd time to be staking out this position. In the aftermath of the 1980's building boom, a widespread reaction has set in against stand-alone, signature buildings by star architects. The movement today is toward urban systems, social responsibility and the connective tissue that integrates buildings into community life. If there is any validity to Mr. Koolhaas's position, it must hinge on whether his designs are stronger, architecturally and urbanistically, than the solo performances we've already seen.
I believe that his designs are indeed stronger, and that their strength lies mainly in their forms. After all, any properly run library, school, museum or convention center should be able to gather crowds. If there's a larger urban dimension in Mr. Koolhaas's designs for these institutions, it is because his forms vibrate on some urban frequency other architects have not yet tuned in to. But how to analyze those vibrations?
Mr. Riley refers to the "marked sense of formlessness" of Mr. Koolhaas's projects, and the visitor to the show is confronted by a dizzying array of forms: ovals, cloud shapes, diagonals, grids, screens of perforated steel and corrugated glass, undulating ramps, elongated triangles, tilted ramps, media projections. These forms are seemingly haphazard in their purpose if not in their skillful composition. And one hesitates to analyze the logic of that composition, not only because it is elusive, but also because Mr. Koolhaas's clear intention is to provide pleasure through the appearance of spontaneity.
Still, one of the major advantages of seeing these projects in a single gallery is that a unifying design concept does emerge. In most of the projects, the defining form arises from Mr. Koolhaas's attempt to loosely reconcile a spiral or pinwheel shape with a square or a rectilinear grid. The spiral harks back to Wright's Guggenheim Museum, the unbuilt "endless museum" project of Le Corbusier, the pinwheel plan of Mies van der Rohe's early villas, the ramp of Harrison's Trylon and Perisphere. But some may feel that Mr. Koolhaas's most pertinent historical precedent is Bruegel's "Tower of Babel," with its vertiginous terror, its breathtaking hubris and its iconic image of a polyglot metropolis housed within one monumental coil.
Occasionally, as in his 1989 design for the French National Library in Paris, Mr. Koolhaas places a conventional spiral within a rectangular volume. More often, the spiral is discernible only in the whirling organization of interior spaces. For the Kunsthal in Rotterdam, completed in 1992, the spiral takes the form of a series of squared-off interior ramps. For the Jussieu Library in Paris, entire floors of the high-rise building are sliced and tilted to create a free-form, continuous ramp, dotted with auditoriums, classrooms and cafes, as if an entire Parisian boulevard had been carefully folded up and placed inside a gleaming crystal box.
At Congrexpo, the oval convention center shortly to open in Lille, visitors will whirl through time and sensibility as well as space. From an auditorium shaped like a Roman amphitheater, they will pass to an erotic fantasy of a theater lined with gold-studded black leatherette. The building's ovoid exterior is clad with a rectilinear collage of flashy finishes: shingled glass, concrete in a tacky black pebble texture and corrugated glass shot through with metallic filaments, an effect at once gossamer and garish.
For Wright, the spiral was an anti-urban symbol. It signified not only organic growth, but also spatial freedom, particularly the mobility made possible by the car. For Mr. Koolhaas, the spiral also signifies growth, but of an urban, artificial kind. Where Wright summoned up images of trees, hills, the highway unrolling across the prairie to escape urban congestion, Mr. Koolhaas ushers us into a tight coil densely packed with shapes, colors, materials, solids and voids that emulate the city in its complexity, variety, social condensation and insatiable appetite for spectacle.
But Mr. Koolhaas's designs are not mindless merry-go-rounds. His attempt to merge the grid with the spiral conveys a philosophical message. The square is a symbol of reason, the spiral a sign of romance. In synthesizing these forms, Mr. Koolhaas shows that clarity and reason are not the enemies of romanticism; they are the essential preconditions for it. A clear-eyed view of the contemporary city and a pragmatic grasp of what architects can reasonably achieve within it form the foundation from which a truly lyrical expression can arise.
This idea sets Mr. Koolhaas apart from modernists and post-modernists alike. Orthodox modern architects banished romantic myth-making in favor of objective truth. Post-modernists hoped to restore a more romantic view of the city, but alas, they saw romance as a restoration, a feeling that could be recaptured only by looking backward to a sepia-tinted past.
Mr. Koolhaas, by contrast, seeks a lyrical mythology for the city as it exists today, with its electronic information circuits gaily humming amid brutal physical decay, its enduring glamour improbably compounded from money, fashion, ambition, fear, destitution, tackiness and profound hope. He is not the only architect of his generation engaged in that search. But none have carried it further, sustained it with greater inventiveness and poise, or arrived at such rich results. Now that's coping.
In his first-rate design for the show, Mr. Riley had the happy inspiration of using bus-stop poster boxes to organize the gallery space. The boxes are arranged in pinwheel fashion, recalling the free-standing planes of the classic Miesian villa, and each contains a blowup picture of the project displayed beside it. This witty synthesis of the Bauhaus and the Gap elegantly mirrors Mr. Koolhaas's street-smart sensibility as it teases out the logic of his forms.
Don't miss this bus.
"O.M.A. at MOMA: Rem Koolhaas and the Place of Public Architecture" remains at the Museum of Modern Art, 11 West 53d Street, through Jan. 31. It then travels to the Canadian Center for Architecture in Montreal (Feb. 21 to April 21) and the Wexner Center for the Arts in Columbus, Ohio (opening May).
Codakia-rich fossiliferous limestone of the Grotto Beach Formation (Upper Pleistocene) at the northeastern side of Moon Rock Pond, northeastern San Salvador Island, eastern Bahamas.
The fossiliferous limestone shown above is dominated by fossil bivalves, principally Codakia orbicularis (Linnaeus, 1758) - the tiger lucine clam. This is part of the Cockburn Town Member of the Grotto Beach Limestone (lower Upper Pleistocene, Sangamonian, MIS 5e, 119-131 ka).
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The surface bedrock geology of San Salvador consists entirely of Pleistocene and Holocene limestones. Thick and relatively unforgiving vegetation covers most of the island’s interior (apart from inland lakes). Because of this, the most easily-accessible rock outcrops are along the island’s shorelines.
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Stratigraphic Succession in the Bahamas:
Rice Bay Formation (Holocene, <10 ka), subdivided into two members (Hanna Bay Member over North Point Member)
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Grotto Beach Formation (lower Upper Pleistocene, 119-131 ka), subdivided into two members (Cockburn Town Member over French Bay Member)
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Owl's Hole Formation (Middle Pleistocene, ~215-220 ka & ~327-333 ka & ~398-410 ka & older)
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San Salvador’s surface bedrock can be divided into two broad lithologic categories:
1) LIMESTONES
2) PALEOSOLS
The limestones were deposited during sea level highstands (actually, only during the highest of the highstands). During such highstands (for example, right now), the San Salvador carbonate platform is partly flooded by ocean water. At such times, the “carbonate factory” is on, and abundant carbonate sediment grains are generated by shallow-water organisms living on the platform. The abundance of carbonate sediment means there will be abundant carbonate sedimentary rock formed after burial and cementation (diagenesis). These sea level highstands correspond with the climatically warm interglacials during the Pleistocene Ice Age.
Based on geochronologic dating on various Bahamas islands, and based on a modern understanding of the history of Pleistocene-Holocene global sea level changes, surficial limestones in the Bahamas are known to have been deposited at the following times (expressed in terms of marine isotope stages, “MIS” - these are the glacial-interglacial climatic cycles determined from δ18O analysis):
1) MIS 1 - the Holocene, <10 k.y. This is the current sea level highstand.
2) MIS 5e - during the Sangamonian Interglacial, in the early Late Pleistocene, from 119 to 131 k.y. (sea level peaked at ~125 k.y.)
3) MIS 7 - ~215 to 220 k.y. - late Middle Pleistocene
4) MIS 9 - ~327-333 k.y. - late Middle Pleistocene
5) MIS 11 - ~398-410 k.y. - late Middle Pleistocene
Bahamian limestones deposited during MIS 1 are called the Rice Bay Formation. Limestones deposited during MIS 5e are called the Grotto Beach Formation. Limestones deposited during MIS 7, 9, 11, and perhaps as old as MIS 13 and 15, are called the Owl’s Hole Formation. These stratigraphic units were first established on San Salvador Island (the type sections are there), but geologic work elsewhere has shown that the same stratigraphic succession also applies to the rest of the Bahamas.
During times of lowstands (= times of climatically cold glacial intervals of the Pleistocene Ice Age), weathering and pedogenesis results in the development of soils. With burial and diagenesis, these soils become paleosols. The most common paleosol type in the Bahamas is calcrete (a.k.a. caliche; a.k.a. terra rosa). Calcrete horizons cap all Pleistocene-aged stratigraphic units in the Bahamas, except where erosion has removed them. Calcretes separate all major stratigraphic units. Sometimes, calcrete-looking horizons are encountered in the field that are not true paleosols.
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Subsurface Stratigraphy of San Salvador Island:
The island’s stratigraphy below the Owl’s Hole Formation was revealed by a core drilled down ~168 meters (~550-feet) below the surface (for details, see Supko, 1977). The well site was at 3 meters above sea level near Graham’s Harbour beach, between Line Hole Settlement and Singer Bar Point (northern margin of San Salvador Island). The first 37 meters were limestones. Below that, dolostones dominate, alternating with some mixed dolostone-limestone intervals. Reddish-brown calcretes separate major units. Supko (1977) infers that the lowest rocks in the core are Upper Miocene to Lower Pliocene, based on known Bahamas Platform subsidence rates.
In light of the successful island-to-island correlations of Middle Pleistocene, Upper Pleistocene, and Holocene units throughout the Bahamas (see the Bahamas geologic literature list below), it seems reasonable to conclude that San Salvador’s subsurface dolostones may correlate well with sub-Pleistocene dolostone units exposed in the far-southeastern portions of the Bahamas Platform.
Recent field work on Mayaguana Island has resulted in the identification of Miocene, Pliocene, and Lower Pleistocene surface outcrops (see: www2.newark.ohio-state.edu/facultystaff/personal/jstjohn/...). On Mayaguana, the worked-out stratigraphy is:
- Rice Bay Formation (Holocene)
- Grotto Beach Formation (Upper Pleistocene)
- Owl’s Hole Formation (Middle Pleistocene)
- Misery Point Formation (Lower Pleistocene)
- Timber Bay Formation (Pliocene)
- Little Bay Formation (Upper Miocene)
- Mayaguana Formation (Lower Miocene)
The Timber Bay Fm. and Little Bay Fm. are completely dolomitized. The Mayaguana Fm. is ~5% dolomitized. The Misery Point Fm. is nondolomitized, but the original aragonite mineralogy is absent.
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The stratigraphic information presented here is synthesized from the Bahamian geologic literature.
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Supko, P.R. 1977. Subsurface dolomites, San Salvador, Bahamas. Journal of Sedimentary Petrology 47: 1063-1077.
Bowman, P.A. & J.W. Teeter. 1982. The distribution of living and fossil Foraminifera and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador, Bahamas. San Salvador Field Station Occasional Papers 1982(2). 21 pp.
Sanger, D.B. & J.W. Teeter. 1982. The distribution of living and fossil Ostracoda and their use in the interpretation of the post-Pleistocene history of Little Lake, San Salvador Island, Bahamas. San Salvador Field Station Occasional Papers 1982(1). 26 pp.
Gerace, D.T., R.W. Adams, J.E. Mylroie, R. Titus, E.E. Hinman, H.A. Curran & J.L. Carew. 1983. Field Guide to the Geology of San Salvador (Third Edition). 172 pp.
Curran, H.A. 1984. Ichnology of Pleistocene carbonates on San Salvador, Bahamas. Journal of Paleontology 58: 312-321.
Anderson, C.B. & M.R. Boardman. 1987. Sedimentary gradients in a high-energy carbonate lagoon, Snow Bay, San Salvador, Bahamas. CCFL Bahamian Field Station Occasional Paper 1987(2). (31) pp.
1988. Bahamas Project. pp. 21-48 in First Keck Research Symposium in Geology (Abstracts Volume), Beloit College, Beloit, Wisconsin, 14-17 April 1988.
1989. Proceedings of the Fourth Symposium on the Geology of the Bahamas, June 17-22, 1988. 381 pp.
1989. Pleistocene and Holocene carbonate systems, Bahamas. pp. 18-51 in Second Keck Research Symposium in Geology (Abstracts Volume), Colorado College, Colorado Springs, Colorado, 14-16 April 1989.
Curran, H.A., J.L. Carew, J.E. Mylroie, B. White, R.J. Bain & J.W. Teeter. 1989. Pleistocene and Holocene carbonate environments on San Salvador Island, Bahamas. 28th International Geological Congress Field Trip Guidebook T175. 46 pp.
1990. The 5th Symposium on the Geology of the Bahamas, June 15-19, 1990, Abstracts and Programs. 29 pp.
1991. Proceedings of the Fifth Symposium on the Geology of the Bahamas. 247 pp.
1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Abstracts and Program. 26 pp.
1992. Proceedings of the 4th Symposium on the Natural History of the Bahamas, June 7-11, 1991. 123 pp.
Boardman, M.R., C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The geology of Columbus' landfall: a field guide to the Holcoene geology of San Salvador, Bahamas, Field trip 3 for the annual meeting of the Geological Society of America, Cincinnati, Ohio, October 26-29, 1992. Ohio Division of Geological Survey Miscellaneous Report 2. 49 pp.
Carew, J.L., J.E. Mylroie, N.E. Sealey, M. Boardman, C. Carney, B. White, H.A. Curran & D.T. Gerace. 1992. The 6th Symposium on the Geology of the Bahamas, June 11-15, 1992, Field Trip Guidebook. 56 pp.
1993. Proceedings of the 6th Symposium on the Geology of the Bahamas, June 11-15, 1992. 222 pp.
Lawson, B.M. 1993. Shelling San Sal, an Illustrated Guide to Common Shells of San Salvador Island, Bahamas. San Salvador, Bahamas. Bahamian Field Station. 63 pp.
1994. The 7th Symposium on the Geology of the Bahamas, June 16-20, 1994, Abstracts and Program. 26 pp.
1994. Proceedings of the 5th Symposium on the Natural History of the Bahamas, June 11-14, 1993. 107 pp.
Carew, J.L. & J.E. Mylroie. 1994. Geology and Karst of San Salvador Island, Bahamas: a Field Trip Guidebook. 32 pp.
Godfrey, P.J., R.L. Davis, R.R. Smtih & J.A. Wells. 1994. Natural History of Northeastern San Salvador Island: a "New World" Where the New World Began, Bahamian Field Station Trail Guide. 28 pp.
Hinman, G. 1994. A Teacher's Guide to the Depositional Environments on San Salvador Island, Bahamas. 64 pp.
Mylroie, J.E. & J.L. Carew. 1994. A Field Trip Guide Book of Lighthouse Cave, San Salvador Island, Bahamas. 10 pp.
1995. Proceedings of the Seventh Symposium on the Geology of the Bahamas, June 16-20, 1994. 134 pp.
1995. Terrestrial and shallow marine geology of the Bahamas and Bermuda. Geological Society of America Special Paper 300.
1996. The 8th Symposium on the Geology of the Bahamas, May 30-June 3, 1996, Abstracts and Program. 21 pp.
1996. Proceedings of the 6th Symposium on the Natural History of the Bahamas, June 9-13, 1995. 165 pp.
1997. Proceedings of the 8th Symposium on the Geology of the Bahamas and Other Carbonate Regions, May 30-June 3, 1996. 213 pp.
Curran, H.A., B. White & M.A. Wilson. 1997. Guide to Bahamian Ichnology: Pleistocene, Holocene, and Modern Environments. San Salvador, Bahamas. Bahamian Field Station. 61 pp.
1998. The 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-June 8, 1998, Abstracts and Program. 25 pp.
Wilson, M.A., H.A. Curran & B. White. 1998. Paleontological evidence of a brief global sea-level event during the last interglacial. Lethaia 31: 241-250.
1999. Proceedings of the 9th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 4-8, 1998. 142 pp.
2000. The 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2000, Abstracts and Program. 29+(1) pp.
2001. Proceedings of the 10th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2000. 200 pp.
Bishop, D. & B.J. Greenstein. 2001. The effects of Hurricane Floyd on the fidelity of coral life and death assemblages in San Salvador, Bahamas: does a hurricane leave a signature in the fossil record? Geological Society of America Abstracts with Programs 33(4): 51.
Gamble, V.C., S.J. Carpenter & L.A. Gonzalez. 2001. Using carbon and oxygen isotopic values from acroporid corals to interpret temperature fluctuations around an unconformable surface on San Salvador Island, Bahamas. Geological Society of America Abstracts with Programs 33(4): 52.
Gardiner, L. 2001. Stability of Late Pleistocene reef mollusks from San Salvador Island, Bahamas. Palaios 16: 372-386.
Ogarek, S.A., C.K. Carney & M.R. Boardman. 2001. Paleoenvironmental analysis of the Holocene sediments of Pigeon Creek, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 17.
Schmidt, D.A., C.K. Carney & M.R. Boardman. 2001. Pleistocene reef facies diagenesis within two shallowing-upward sequences at Cockburntown, San Salvador, Bahamas. Geological Society of America Abstracts with Programs 33(4): 42.
2002. The 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6th-June 10, 2002, Abstracts and Program. 29 pp.
2004. The 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-June 7, 2004, Abstracts and Program. 33 pp.
2004. Proceedings of the 11th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 6-10, 2002. 240 pp.
Martin, A.J. 2006. Trace Fossils of San Salvador. 80 pp.
2006. Proceedings of the 12th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 3-7, 2004. 249 pp.
2006. The 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-June 12, 2006, Abstracts and Program. 27 pp.
Mylroie, J.E. & J.L. Carew. 2008. Field Guide to the Geology and Karst Geomorphology of San Salvador Island. 88 pp.
2008. Proceedings of the 13th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 8-12, 2006. 223 pp.
2008. The 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-June 16, 2006, Abstracts and Program. 26 pp.
2010. Proceedings of the 14th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 12-16, 2008. 249 pp.
2010. The 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-June 21, 2010, Abstracts and Program. 36 pp.
2012. Proceedings of the 15th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 17-21, 2010. 183 pp.
2012. The 16th Symposium on the Geology of the Bahamas and Other Carbonate Regions, June 14-June 18, 2012, Abstracts with Program. 45 pp.