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GONE--This mid-century piece is great for a graphic designer or artist; it doesn't take up too much room, yet it has a huge work surface to spread out on--books, tablets, screens--the lot!
Late season wild flowers carpet the high desert near Boron, California. Photo taken April 28, 2020 using Canon PowerShot SX20 and tripod.
Drawing is a form of visual art in which a person uses various drawing instruments to mark paper or another two-dimensional medium. Instruments include graphite pencils, pen and ink, inked brushes, wax color pencils, crayons, charcoal, chalk, pastels, various kinds of erasers, markers, styluses, various metals (such as silverpoint) and electronic drawing.
A drawing instrument releases small amount of material onto a surface, leaving a visible mark. The most common support for drawing is paper, although other materials, such as cardboard, plastic, leather, canvas, and board, may be used. Temporary drawings may be made on a blackboard or whiteboard or indeed almost anything. The medium has been a popular and fundamental means of public expression throughout human history. It is one of the simplest and most efficient means of communicating visual ideas.[1] The wide availability of drawing instruments makes drawing one of the most common artistic activities.
In addition to its more artistic forms, drawing is frequently used in commercial illustration, animation, architecture, engineering and technical drawing. A quick, freehand drawing, usually not intended as a finished work, is sometimes called a sketch. An artist who practices or works in technical drawing may be called a drafter, draftsman or a draughtsman.[2]
Drawing is one of the major forms of expression within the visual arts. It is generally concerned with the marking of lines and areas of tone onto paper/other material, where the accurate representation of the visual world is expressed upon a plane surface.[3] Traditional drawings were monochrome, or at least had little colour,[4] while modern colored-pencil drawings may approach or cross a boundary between drawing and painting. In Western terminology, drawing is distinct from painting, even though similar media often are employed in both tasks. Dry media, normally associated with drawing, such as chalk, may be used in pastel paintings. Drawing may be done with a liquid medium, applied with brushes or pens. Similar supports likewise can serve both: painting generally involves the application of liquid paint onto prepared canvas or panels, but sometimes an underdrawing is drawn first on that same support.
Madame Palmyre with Her Dog, 1897. Henri de Toulouse-Lautrec
Galileo Galilei. Phases of the Moon. 1616.
Drawing is often exploratory, with considerable emphasis on observation, problem-solving and composition. Drawing is also regularly used in preparation for a painting, further obfuscating their distinction. Drawings created for these purposes are called studies.
There are several categories of drawing, including figure drawing, cartooning, doodling, free hand and shading. There are also many drawing methods, such as line drawing, stippling, shading, the surrealist method of entopic graphomania (in which dots are made at the sites of impurities in a blank sheet of paper, and lines are then made between the dots), and tracing (drawing on a translucent paper, such as tracing paper, around the outline of preexisting shapes that show through the paper).
A quick, unrefined drawing may be called a sketch.
In fields outside art, technical drawings or plans of buildings, machinery, circuitry and other things are often called "drawings" even when they have been transferred to another medium by printing.
History[edit]
Drawing as a Form of Communication Drawing is one of the oldest forms of human expression, with evidence for its existence preceding that of written communication.[5] It is believed that drawing was used as a specialised form of communication before the invent of the written language,[5][6] demonstrated by the production of cave and rock paintings created by Homo sapiens sapiens around 30,000 years ago.[7] These drawings, known as pictograms, depicted objects and abstract concepts.[8] The sketches and paintings produced in prehistoric times were eventually stylised and simplified, leading to the development of the written language as we know it today.
Drawing in the Arts Drawing is used to express one's creativity, and therefore has been prominent in the world of art. Throughout much of history, drawing was regarded as the foundation for artistic practise.[9] Initially, artists used and reused wooden tablets for the production of their drawings.[10] Following the widespread availability of paper in the 14th century, the use of drawing in the arts increased. At this point, drawing was commonly used as a tool for thought and investigation, acting as a study medium whilst artists were preparing for their final pieces of work.[11][12] In a period of artistic flourish, the Renaissance brought about drawings exhibiting realistic representational qualities,[13] where there was a lot of influence from geometry and philosophy.[14]
The invention of the first widely available form of photography led to a shift in the use of drawing in the arts.[15] Photography took over from drawing as a more superior method for accurately representing visual phenomena, and artists began to abandon traditional drawing practises.[16] Modernism in the arts encouraged "imaginative originality"[17] and artists' approach to drawing became more abstract.
Drawing Outside the Arts Although the use of drawing is extensive in the arts, its practice is not confined purely to this field. Before the widespread availability of paper, 12th century monks in European monasteries used intricate drawings to prepare illustrated, illuminated manuscripts on vellum and parchment. Drawing has also been used extensively in the field of science, as a method of discovery, understanding and explanation. In 1616, astronomer Galileo Galilei explained the changing phases of the moon through his observational telescopic drawings.[16] Additionally, in 1924, geophysicist Alfred Wegener used illustrations to visually demonstrate the origin of the continents.The medium is the means by which ink, pigment or color are delivered onto the drawing surface. Most drawing media are either dry (e.g. graphite, charcoal, pastels, Conté, silverpoint), or use a fluid solvent or carrier (marker, pen and ink). Watercolor pencils can be used dry like ordinary pencils, then moistened with a wet brush to get various painterly effects. Very rarely, artists have drawn with (usually decoded) invisible ink. Metalpoint drawing usually employs either of two metals: silver or lead.[20] More rarely used are gold, platinum, copper, brass, bronze, and tinpoint.
Paper comes in a variety of different sizes and qualities, ranging from newspaper grade up to high quality and relatively expensive paper sold as individual sheets.[21] Papers can vary in texture, hue, acidity, and strength when wet. Smooth paper is good for rendering fine detail, but a more "toothy" paper holds the drawing material better. Thus a coarser material is useful for producing deeper contrast.
Newsprint and typing paper may be useful for practice and rough sketches. Tracing paper is used to experiment over a half-finished drawing, and to transfer a design from one sheet to another. Cartridge paper is the basic type of drawing paper sold in pads. Bristol board and even heavier acid-free boards, frequently with smooth finishes, are used for drawing fine detail and do not distort when wet media (ink, washes) are applied. Vellum is extremely smooth and suitable for very fine detail. Coldpressed watercolor paper may be favored for ink drawing due to its texture.
Acid-free, archival quality paper keeps its color and texture far longer than wood pulp based paper such as newsprint, which turns yellow and become brittle much sooner.
The basic tools are a drawing board or table, pencil sharpener and eraser, and for ink drawing, blotting paper. Other tools used are circle compass, ruler, and set square. Fixative is used to prevent pencil and crayon marks from smudging. Drafting tape is used to secure paper to drawing surface, and also to mask an area to keep it free of accidental marks sprayed or spattered materials and washes. An easel or slanted table is used to keep the drawing surface in a suitable position, which is generally more horizontal than the position used in painting.
Technique[edit]
Raphael, study for what became the Alba Madonna, with other sketches
Almost all draftsmen use their hands and fingers to apply the media, with the exception of some handicapped individuals who draw with their mouth or feet.[22]
Prior to working on an image, the artist typically explores how various media work. They may try different drawing implements on practice sheets to determine value and texture, and how to apply the implement to produce various effects.
The artist's choice of drawing strokes affects the appearance of the image. Pen and ink drawings often use hatching—groups of parallel lines.[23] Cross-hatching uses hatching in two or more different directions to create a darker tone. Broken hatching, or lines with intermittent breaks, form lighter tones—and controlling the density of the breaks achieves a gradation of tone. Stippling, uses dots to produce tone, texture or shade. Different textures can be achieved depending on the method used to build tone.[24]
Drawings in dry media often use similar techniques, though pencils and drawing sticks can achieve continuous variations in tone. Typically a drawing is filled in based on which hand the artist favors. A right-handed artist draws from left to right to avoid smearing the image. Erasers can remove unwanted lines, lighten tones, and clean up stray marks. In a sketch or outline drawing, lines drawn often follow the contour of the subject, creating depth by looking like shadows cast from a light in the artist's position.
Sometimes the artist leaves a section of the image untouched while filling in the remainder. The shape of the area to preserve can be painted with masking fluid or cut out of a frisket and applied to the drawing surface, protecting the surface from stray marks until the mask is removed.
Another method to preserve a section of the image is to apply a spray-on fixative to the surface. This holds loose material more firmly to the sheet and prevents it from smearing. However the fixative spray typically uses chemicals that can harm the respiratory system, so it should be employed in a well-ventilated area such as outdoors.
Another technique is subtractive drawing in which the drawing surface is covered with graphite or charcoal and then erased to make the image.[25]
Tone[edit]
Line drawing in sanguine by Leonardo da Vinci
Shading is the technique of varying the tonal values on the paper to represent the shade of the material as well as the placement of the shadows. Careful attention to reflected light, shadows and highlights can result in a very realistic rendition of the image.
Blending uses an implement to soften or spread the original drawing strokes. Blending is most easily done with a medium that does not immediately fix itself, such as graphite, chalk, or charcoal, although freshly applied ink can be smudged, wet or dry, for some effects. For shading and blending, the artist can use a blending stump, tissue, a kneaded eraser, a fingertip, or any combination of them. A piece of chamois is useful for creating smooth textures, and for removing material to lighten the tone. Continuous tone can be achieved with graphite on a smooth surface without blending, but the technique is laborious, involving small circular or oval strokes with a somewhat blunt point.
Shading techniques that also introduce texture to the drawing include hatching and stippling. A number of other methods produce texture. In addition to the choice of paper, drawing material and technique affect texture. Texture can be made to appear more realistic when it is drawn next to a contrasting texture; a coarse texture is more obvious when placed next to a smoothly blended area. A similar effect can be achieved by drawing different tones close together. A light edge next to a dark background stands out to the eye, and almost appears to float above the surface.
Form and proportion[edit]
Pencil portrait by Ingres
Measuring the dimensions of a subject while blocking in the drawing is an important step in producing a realistic rendition of the subject. Tools such as a compass can be used to measure the angles of different sides. These angles can be reproduced on the drawing surface and then rechecked to make sure they are accurate. Another form of measurement is to compare the relative sizes of different parts of the subject with each other. A finger placed at a point along the drawing implement can be used to compare that dimension with other parts of the image. A ruler can be used both as a straightedge and a device to compute proportions.
When attempting to draw a complicated shape such as a human figure, it is helpful at first to represent the form with a set of primitive volumes. Almost any form can be represented by some combination of the cube, sphere, cylinder, and cone. Once these basic volumes have been assembled into a likeness, then the drawing can be refined into a more accurate and polished form. The lines of the primitive volumes are removed and replaced by the final likeness. Drawing the underlying construction is a fundamental skill for representational art, and is taught in many books and schools. Its correct application resolves most uncertainties about smaller details, and makes the final image look consistent.[26]
A more refined art of figure drawing relies upon the artist possessing a deep understanding of anatomy and the human proportions. A trained artist is familiar with the skeleton structure, joint location, muscle placement, tendon movement, and how the different parts work together during movement. This allows the artist to render more natural poses that do not appear artificially stiff. The artist is also familiar with how the proportions vary depending on the age of the subject, particularly when drawing a portrait.
Perspective[edit]
Linear perspective is a method of portraying objects on a flat surface so that the dimensions shrink with distance. Each set of parallel, straight edges of any object, whether a building or a table, follows lines that eventually converge at a vanishing point. Typically this convergence point is somewhere along the horizon, as buildings are built level with the flat surface. When multiple structures are aligned with each other, such as buildings along a street, the horizontal tops and bottoms of the structures typically converge at a vanishing point.
Two-point perspective drawing
When both the fronts and sides of a building are drawn, then the parallel lines forming a side converge at a second point along the horizon (which may be off the drawing paper.) This is a two-point perspective.[27] Converging the vertical lines to a third point above or below the horizon then produces a three-point perspective.
Depth can also be portrayed by several techniques in addition to the perspective approach above. Objects of similar size should appear ever smaller the further they are from the viewer. Thus the back wheel of a cart appears slightly smaller than the front wheel. Depth can be portrayed through the use of texture. As the texture of an object gets further away it becomes more compressed and busy, taking on an entirely different character than if it was close. Depth can also be portrayed by reducing the contrast in more distant objects, and by making their colors less saturated. This reproduces the effect of atmospheric haze, and cause the eye to focus primarily on objects drawn in the foreground.
Artistry[edit]
Chiaroscuro study drawing by William-Adolphe Bouguereau
The composition of the image is an important element in producing an interesting work of artistic merit. The artist plans element placement in the art to communicate ideas and feelings with the viewer. The composition can determine the focus of the art, and result in a harmonious whole that is aesthetically appealing and stimulating.
The illumination of the subject is also a key element in creating an artistic piece, and the interplay of light and shadow is a valuable method in the artist's toolbox. The placement of the light sources can make a considerable difference in the type of message that is being presented. Multiple light sources can wash out any wrinkles in a person's face, for instance, and give a more youthful appearance. In contrast, a single light source, such as harsh daylight, can serve to highlight any texture or interesting features.
When drawing an object or figure, the skilled artist pays attention to both the area within the silhouette and what lies outside. The exterior is termed the negative space, and can be as important in the representation as the figure. Objects placed in the background of the figure should appear properly placed wherever they can be viewed.
Drawing process in the Academic Study of a Male Torso by Jean-Auguste-Dominique Ingres (1801, National Museum, Warsaw)
A study is a draft drawing that is made in preparation for a planned final image. Studies can be used to determine the appearances of specific parts of the completed image, or for experimenting with the best approach for accomplishing the end goal. However a well-crafted study can be a piece of art in its own right, and many hours of careful work can go into completing a study.
Process[edit]
Individuals display differences in their ability to produce visually accurate drawings.[28] A visually accurate drawing is described as being "recognized as a particular object at a particular time and in a particular space, rendered with little addition of visual detail that can not be seen in the object represented or with little deletion of visual detail”.[29]
Investigative studies have aimed to explain the reasons why some individuals draw better than others. One study posited four key abilities in the drawing process: perception of objects being drawn, ability to make good representational decisions, motor skills required for mark-making and the drawer's own perception of their drawing.[29] Following this hypothesis, several studies have sought to conclude which of these processes are most significant in affecting the accuracy of drawings.
Motor function Motor function is an important physical component in the 'Production Phase' of the drawing process.[30] It has been suggested that motor function plays a role in drawing ability, though its effects are not significant.[29]
Perception It has been suggested that an individual's ability to perceive an object they are drawing is the most important stage in the drawing process.[29] This suggestion is supported by the discovery of a robust relationship between perception and drawing ability.[31]
This evidence acted as the basis of Betty Edwards' how-to drawing book, Drawing on the Right Side of the Brain.[32] Edwards aimed to teach her readers how to draw, based on the development of the reader's perceptual abilities.
Furthermore, the influential artist and art critic John Ruskin emphasised the importance of perception in the drawing process in his book The Elements of Drawing.[33] He stated that "For I am nearly convinced, that once we see keenly enough, there is very little difficult in drawing what we see".
Visual memory has also been shown to influence one's ability to create visually accurate drawings. Short-term memory plays an important part in drawing as one’s gaze shifts between the object they are drawing and the drawing itself.[34]
On this map¹, each pixel (p) corresponds to actual (⁓6.2E3 m)² @φ0λ0; R ≅ 0.06° @0φ°. Cfr. notes² over the above image.
ŒV⌆♁ ⌖N0E0A∞ φ10λ10 1:24,027,658 (1√p φ° = 1/96" ≅ 6.2E3 m)
Apparent c @ scale ≅ 12.477 mps; 1 LD ≅ 16 m; 1 LY ≅ 1.024 LD.
vₒʀ♁2.978E4vₑ♁1.119E4vᵣ♁ᴇǫ4.651E2
M5.972E24V1.083E15ρ5.514E03r6.378E06S5.101E11 ♁
M5.135E18V1.400E12ρ1.225E00r1.000E06S1.257E11 A♁
M1.386E21V1.386E06ρ1.000E03r3.620E05S1.647E09 H₂O♁
NOTES
1. L.H. Rohwedder 2006: Transversal ŒV⌆♁ (original image).
2. Map scale ≅ 1:24,027,658. Lφ° = (φ°πR)/180°; R = Rₙ₌ₑ = (Rₙ+Rₑ)/2 ≅ 6.371E6 m; 10 Lφ° = 178√p ≅ ±1.112E6 m; ±1√p φ° ≅ ±2.6E-4 m ≅ ±6.2E3 m; -90°≤φ°≤90°; -180°≤λ°≤180°. Lλ° = (λ°πRₙcosφ°){180°[1-(Rₙ²-Rₑ²)Rₙ⁻²sin²φ°]½}⁻¹; 10 Lλ° @ 0 φ° ≅ 1.106E6 m; ±1√p λ° @0φ° ≅ 6.2E3 m; -90°≤φ°≤90°; -180°≤λ°≤180°.
Fucking N48.067E12.863G4.670E2
Geographic North Pole (⏁) N90.000E0.000G0.000E0
Magnetic N Pole (not shown) N86.494E162.867G0.000E0
Geomagnetic N Pole N80.700E-72.700G1.490E3
Arctic Circle ∩ Prime Meridian N66.567E0.000G0.000E0
Tropic of Cancer ∩ Prime Meridian N23.436E0.000G3.330E2
Null Island (⌖) N0.000E0.000G0.000E0
Tropic of Capricorn ∩ Prime Meridian N-23.436E0.000G0.000E0
Magnetic S Pole (not shown) N-64.081E135.866G0.000E0
Antarctic Circle ∩ Prime Meridian N-66.567E0.000G0.000E0
Geomagnetic S Pole (not shown) N-80.700E107.300G3.392E3
Geographic South Pole (⏂) N-90.000E0.000G2.835E3
Dead Sea N31.500E35.500G-4.305E2
Everest N27.988E86.925G8.848E3
Veryovkina cave N43.416E40.356G-2.212E3
Kilimanjaro N-3.076E37.353G5.895E3
Lake Victoria N-1.000E33.000G1.134E3
Litke Deep N82.400E19.517G-5.449E3
Meteor Deep N-55.419E-26.405G-8.278E3
Milwaukee Deep N19.836E-66.754G-8.383E3
Calypso Deep N36.567E21.133G-5.109E3
Chimborazo N-1.469E-78.818G6.263E3
Huascarán N-9.122E-77.604G6.768E3
Cape Agulhas N-34.833E20.000G0
Cape of Good Hope N-34.357E18.474G0
Cape Barrow (not shown) N68.017E-110.133G0
Cape Leeuwin (not shown) N-34.374E115.136G0
West Cape (not shown) N-45.906E166.428G0
East Cape (not shown) N-37.689E178.548G0
South Point (not shown) N-39.136E146.375G0
Sunda Trench (not shown) N-10.317E109.967G-7.290E3
Horizon Deep (not shown) N-23.450E175.233G-10.832E3
Challenger Deep (not shown) N11.373E142.592G-11.009E3
Denman Glacier (not shown) N-66.750E99.500G-3.500E3
Africa (54 ss): 2A4B8CD4E6GK3L7M3NR8S3TU2Z
Central America (7 ss): BiG SHiNy CuP
Continental South America (13 ss): ABBCCEGGPPSUV
Insulindia (17 ss): ISBMTLVCMSBIPCMTT
REFERENCES
E.G.F. Regina 2024: RM028 climate VII-VIII 1970-2029.
D. Livanov 2023: Physics of planet Earth.
Q.H. Zhang & al. 2021: Space hurricane over Earth's polar ionosphere.
C. Bongiovanni & al. 2021: Deepest ocean bathymetry.
J. O'Donoghue 2019: LD-c (3.844E8/1.255 m/s).
P.C. Budassi 2018: Orders of magnitude.
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M.K. Paras & P. Rani 2018: Electrical activity in A♁.
E.G.F. Regina 2018: 4,474 Km from Dildo to Pussy.
E.G.F. Regina 2018: ŒV⌆♁ ⌖⌖N0E-20/160A∞ φ5λ5C4 + rotation.
R. Finelli 2017: Il cammino dell’acqua.
J.C. Iliffe 2017: Quasi-linear map projections.
G. Holzer & al. 2015: A world of innovation.
C. Beccario 2013: earth.nullschool.net.
R.P. Munroe 2011: Map projections.
J.J. van Wijk 2008: Myriahedral projections.
J.F. Hamilton & al. 2008: Atmospheric chemical equator.
G. Allen & al. 2008: Aerosol & trace‐gas in the Darwin area.
D.K. Singh & al. 2004, 2005: Electrical environment of A♁.
J.D. Barrow 2002: The constants of nature.
A.L. Berger 1976: Obliquity and precession for the last 5E6 years.
A.N. Strahler 1952: Hypsometric analysis of erosional topography.
R.E. Horton 1945: Erosional development of streams.
J.G. Verne 1872: Le Tour du monde en 80 jours.
F.W.H.A. von Humboldt 1845-1862: Kosmos.
G. Benzoni 1565: Historia Novi Orbis, L. I, c. V, p. 23.
TI · DMX1943NGIHP · BM02 · ERP5×5C4 · 16.2x8.1 · A♁ · PU · TLE · O→ERP→ŒVP · geomatics · season · weather · antipodes · ⊕X pts · windy.com · lightningmaps.org · ventusky.com · iweathernet.com · space hurricane
Surfacing by artist Kitty Cantrell of Starlite Studio. They make some incredible looking – yet very expensive – sculptures. IIRC, the whales are hand-painted & fired Aluminum then liquid lucite is poured around the whales in a mold, heated for 24 hours to harden the lucite, and then smoothed and polished by hand.
I've thought these recent art pieces that were added to the front yard of a new hotel in the area, were quite interesting.
So I stopped by to take a closer look on my way home from a quick run to the store.
Sort of like waves on a smooth pond after a leaf falls in.
I could find a nice angle for a picture, but the pieces themselves are still quite interesting.
Be well and stay safe. My other thought for the "Surfaces" theme, was cleaning the surfaces in my kitchen, but I've been doing that way too much of that of late. : (
WAH - Surfaces
via Outdoor Surface Painting outdoorsurfacepainting.tumblr.com/post/139533666381
Cycle Lane Line Markings in Welham Green #Cycle #Lane #Line #Markings #Welham #Green t.co/mWRwzk3nyF
via Tarmacadam Surfaces tarmacadamsurfaces.tumblr.com/post/149555401722
Tarmacadam Multi-Use Games Area in Dobwalls #Macadam #MUGA #Surface #Dobwalls t.co/wfEmuWiw0o
Diploria strigosa - fossil symmetrical brain 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.
Septa-Surface all-electric PCC 2798 (St Louis 1947) exits surface car subway @ 40th & Woodland 8-20-80 on Route 13 YEADON.
Postwar PCC's like 2798 had electric braking (hence all-electric label, standee windows (except on double-enders and cars purchased by Kansas City), and had windshields at creater angle than on prewar cars. This car was originally built with a conductor's booth for two-man operation but had been converted by time of photo.
Video: youtu.be/7G2r37m35rU
The surface divides space into two congruent subspaces.
Inspired by these instructions by Damian.
Blue wetpour play area surface with multi coloured rainbow design inserts.
This image is released under creative commons. Feel free to use and please credit www.softsurfaces.co.uk
We were thrilled to find not just one, but 3 Orcas (Killer Whales) making their way through Auke Bay, near Juneau AK. These are three separate whales, travelling together in a pod
See my "Alaska!" set for more shots of this beautiful area. More to come....
You are free to use this texture in any of your projects, both personal and commercial. No credit is required.
"EVA-1 SURFACE ACTIVITY"
Also:
"Diagram illustrating the placement of the ALSEP and other equipment during EVA 1."
Above, along with the image, at:
www.drewexmachina.com/2020/04/21/the-original-mission-of-...
i2.wp.com/www.drewexmachina.com/wp-content/uploads/2020/0...
Credit: Andrew LePage/Drew ExMachina website
I wonder if this was retained for Apollo 14.
The following certainly answers my question. NO. Not even close, with apparently additional/different experiments:
www.nasa.gov/sites/default/files/styles/full_width/public...
Although, per FIGURE 3.1-4, there is still similarity in some 'placements':
www.hq.nasa.gov/alsj/a14/as14-flsproc.pdf
Credit: ALSJ