View allAll Photos Tagged Geologic
The coastal geology at Croyde Bay comprises a mixture of sandstone, slate, siltstone and limestone. A great subject for this stark monochrome landscape shot.
Panasonic DMC-TZ100
Aperture ƒ/5.0
Focal length 9.1 mm
Shutter 1/250
ISO 125
Geology Lesson. © Copyright 2020 G Dan Mitchell - all rights reserved.
Colorful eroded formation in Death Valley National Park.
The title of this photograph is offered with tongue somewhat in cheek... since I would not be the first person you would go to for a real geology lesson, nor for an accurate description of the objective facts that would account for these remarkable formations. I understand that the material was layered a very long time ago, and that additional colors may have been added over time. Eventually the strata were distorted and twisted and then exposed, where the elements began a process of eroding material away and creating the sculpted effects we see today.
Regardless of the explanation, almost everything about this place and places like it evokes wonder: the striking patterns of uplifted and twisted strata, the unusual patterns of colorful material, the subtle curves of the gully that rises and then turn left, and the details visible in the soft light.
G Dan Mitchell is a California photographer and visual opportunist. His book, "California's Fall Color: A Photographer's Guide to Autumn in the Sierra" is available from Heyday Books and Amazon.
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I took this image because of the impressive geology featured. The rock layers plunging from the middle of the image off to the lower right are relatively finely layered orange and darker sedimentary material. But below them is a much more monolithic grey mass.
The materials suggest to me that two different methods of deposition occurred in the past, although I'm not expert enough to explain the lower one (oolitic limestone perhaps?). The finer layers exhibiting bedding planes would suggest sandstone to me.
Note that the monolithic grey material breaks up quite readily when not covered. On the mid-left of the image, the finer layers have gone, and the underlying grey rock has broken up down to the level I'm standing on, apparently as a resulting of rapid vertical cracking (some visible in the interface between the left and right).
These rocks are in the north wall of the Grand Wash, one of two deep but easily-accessed canyons along the scenic drive at the centre of Capitol Reef National Park in Utah.
Grand Wash offers a pleasant, safe introduction to narrow canyon hiking, although even here there are prominent warnings of the dangers of flash floods.
The wash cuts right through the reef and features sheer cliffs of Wingate and Navajo sandstone up to 150m high (in the background above), with many colourful strata and eroded rock formations.
The exact location along Grand Wash Road is arbitrary as I can't remember exactly. In terms of scale, the top of the bedding planes is about 4m above the floor in the foreground. The image is scanned from a negative.
Please no group invites!!! Thank you for your comments or faves!!!
Per favore no inviti a gruppi!!! Grazie per i vostri commenti o fav!!!
A close-up of part of an ornamental piece of stone in Calgary. An intrusive vein (about 1 cm wide) cuts across the rock diagonally (at right).
Copyright J.R. Devaney
Looking north-northeastward from just downstream from the mouth of Boquillas Canyon.
Its upper half still glowing in the late-afternoon sun, the Mexican wall of the Rio Grande's Boquillas Canyon reveals its classic and oft-cited example of crustal disturbance.
Besides being a showcase of marine-carbonate rock deposition in the Cretaceous and extensive volcanic activity in the Tertiary, Big Bend National Park has much to teach the student of structural geology.
Thanks to the Laramide Orogeny and the Basin-and-Range phase that has followed it, this federal preserve and the adjoining Big Bend Ranch State Park contain numerous visible examples of folding and faulting in the Earth's crust.
The feature so beautifully displayed here is a normal fault in the Cretaceous Santa Elena Limestone. It's outlined by the diagonal trace in the center portion of the photo.
The mass of rock to the left of the trace, the headwall, has slid downward along it, just as gravity would seem to dictate. The section to the right is the footwall.
To see the other photos and descriptions in this set and my other Big Bend series, visit my my From Persimmon Gap to Boquillas Canyon album.
A bounty of geological features, including the newly named Manley impact crater, are visible in this image of Mercury taken by the ESA/JAXA BepiColombo mission on 19 June 2023 as the spacecraft sped by for its third of three gravity assist manoeuvres at the planet.
The image was taken at 19:56 UTC (21:56 CEST) by the Mercury Transfer Module’s monitoring camera 3, when the spacecraft was just over 4000 km from the planet’s surface. Closest approach took place at 19:34 UT (21:34 CEST) on the night side of the planet at about 236 km altitude.
The back of the Mercury Planetary Orbiter’s high-gain antenna and part of the spacecraft’s body is also visible in front of Mercury in this image.
The image provides one of the widest views of the globe of Mercury seen during this flyby. It captures a wider view of the features seen in the closer image, such as the Beagle Rupes scarp and Manley Crater. It also includes the straight scarp Challenger Rupes, to the east of Beagle Rupes, that BepiColombo imaged during flyby 2. The image showcases the heavily cratered, ancient surface of the planet, with brighter streaks known as ‘rays’ emanating from younger craters.
The 258 km-wide Raditladi basin is visible between BepiColombo’s high-gain antenna and the top of the image. This is a relatively young basin, and so Mercury scientists continue to debate whether the smooth material on its floor is formed from rock directly melted by the impact or by later volcanic eruptions separated in geological time from the impact. Data collected by BepiColombo when it is in orbit around Mercury will be essential to solve this mystery.
The cameras provide black-and-white snapshots in 1024 x 1024 pixel resolution.
The image has been lightly processed to bring out the surface details of the planet.
Some imaging artefacts such as horizontal striping are also visible. In this view, north is to the upper left corner.
The gravity assist manoeuvre was the third at Mercury and the sixth of nine flybys overall. During its seven-year cruise to the smallest and innermost planet of the Solar System, BepiColombo makes one flyby at Earth, two at Venus and six at Mercury to help steer on course for Mercury orbit in 2025. The Mercury Transfer Module carries two science orbiters: ESA’s Mercury Planetary Orbiter and JAXA’s Mercury Magnetospheric Orbiter. They will operate from complementary orbits to study all aspects of mysterious Mercury from its core to surface processes, magnetic field and exosphere, to better understand the origin and evolution of a planet close to its parent star.
Click here for an annotated version of this image.
ESA/BepiColombo/MTM, CC BY-SA 3.0 IGO
Faults with minor displacement outline a kink band (a left-dipping, steep diagonal zone through the middle of the photo) in well-stratified Kettle River Formation sandstone (Eocene, south-central British Columbia). Location: a Highway 3 roadside outcrop near the town of Midway, close to the border with the USA.
C. J.R. Devaney
Mendocino, California.
I always start to nerd out on interesting geological patterns. This was found emerging from the Mendocino beach. Originally I took 5 exposures of this image, anticipating I'd combine 1 or few of them to gather more of the shadow information. Ended up just choosing this one. Earth is cool.
Spectacular large columnar joint/fracture pattern (pseudo-hexagonal) in feldspar porphyry. This rock may be an intrusion, such as a sill, that is comagmatic with the nearby lava deposits of the Eocene-age Marron Formation (i.e., intrusive magma and extrusive lava of the same general age and chemical/mineralogical composition). Location: a Highway 3 roadside outcrop near the town of Rock Creek in southernmost British Columbia, western Canada.
(This photo is part of a report I wrote in 2012, and is part of Assessment Report 34747 published online by the British Columbia Geological Survey.)
Copyright J.R. Devaney
A combination of anticlines, synclines, faulting, layering, and banding made for some interesting patterns in these rocks. The entire section is about 10 feet tall.
South Park Canyon
Panamint Range
Mojave Desert
Taken at the Purgatory Chasm locale, on the rocky western coast of Sachuest Bay. Facing northeastward.
This famous outcrop, much beloved of soft-rock geologists, features a pale-gray, mostly coarse (and sometimes very coarse) quartzite-clast conglomerate that dates to the Pennsylvanian subperiod (Upper Carboniferous).
This region of the Eastern Seaboard belongs to the Avalonian Terrane—originally a microcontinent associated with the supercontinent Gondwana. The perpatetic landmass of Avalonia migrated far from its original setting and eventually collided with Laurentia, an ancient predecessor of North America. In doing so, it formed part of what is now New England and Canada's Maritime Provinces.
To see the other photos and descriptions in this set, visit my my Rocks of Little Rhody album.
This is an amazing geological phenomenon on the Oregon coast. Long ago, the roof of a sea cave collapsed, creating a vertical tunnel. At high tide, water is channelled up through the hole with incredible force, spewing out the top like a geyser. This well is incredibly dangerous - if anyone ever fell in, they would be killed instantly. The suction power when the water recedes is extreme. For this capture, I wanted to show the water receding back into the well. I used a longer exposure, to smooth out the water motion, and evoke the power of the water being sucked back into the well. This is an incredible sight, and is so unique, I am very happy to have been able to photograph it. This was actually a very challenging capture - I had to constantly clean filters and lenses of salt spray, and almost fell a few times. Plus, just knowing that a few feet away was certain death made it a little scary. I now have a new website - natureasart.photoshelter.com
I hope you can drop by!
Thanks for looking! My most interesting photos are here: www.fluidr.com/photos/markvcr/interesting
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I photographed Reed's Beach to capture the artistic designs that the soil, silt & clay create every day. I find the designs fascinating. Some days they remind me of the veins and arteries of the body.
We were trying to make sense of a rough geological map in order to identify an exposure of Triassic conglomerate on Cannock Chase, Staffordshire, England.
... with my fingers for scale. Pink K-feldspar phenocrysts, white feldspar (plagioclase, etc.), grey quartz, and black mafic minerals.
C. J.R. Devaney
Picture: the white between the plants is the top of a stone, named gneiss. It looks like ice, and is shining.
According to the digital map of Geiteryggen, to be found via the website of the NGU, Norges geologiske undersøkelse geo.ngu.no/ it is possible to find the names of the rocks and stones in a specific municipality. Geiteryggen belongs to Hol Kommune. The Geiteryggen area is geological an area of so-called glimmergneis, glimmerskifer, metasandstein amfibolitt, and fylitt. English: mica gneiss, mica shale, metasandstone amphibolite, and phyllite.
See also:
Geology, rocks and minerals:
flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/gnei...
Gneiss:
Geiteryggen: