#geologic
LightNews LightNews
swphotographer.bsky.social
Valles Caldera ~
The caldera formed by collapse in a series of volcanic eruptions from about 1.4 to 1.1 million years ago. But the geologic evolution of the caldera has continued to today.
#BlueSkyMonday #Volcanic #MountainMonday #NewMexico
November 10, 2025 at 10:47 PM
goosname.bsky.social
biological pronouns?

geologic adverbs.
chemical gerunds.
botanical participles.
psychological appositives.
cosmological infinitives.

sure, why not
November 7, 2025 at 6:50 AM
colincarlson.bsky.social
Every Jew in America is an immigrant on geologic timescales. Proud immigrant politicians, standing up for immigrants? Very Jewish
November 5, 2025 at 5:05 AM
montanoceratops.bsky.social
The stratigraphy of the Judith is sadly very messy and needs a lot of dedicated love and Research in order to figure out large scale correlates between it and Dinosaur Park, Oldman, and Foremost. This map I made shows how messy the stratigraphy can be.
A map of Montana, Alberta, and Saskatchewan with various colored sections for different geologic rock layers
November 9, 2025 at 5:39 PM
johnmbailey.bsky.social
Arches National Park, Utah, preserves over 2,000 natural sandstone arches, as well as many other unusual rock formations. In some areas, the forces of nature have exposed millions of years of geologic history.

buff.ly/B70wH6N #photography #travel #buyintoart #wallart #artforsale
November 11, 2025 at 1:55 PM
camarowrx.bsky.social
A5 #ParkChat I guess that depends what you are looking for. I'm sure someone will mention Custer SP. Ft. Robinson SP (and nearby Toadstool Geologic and Hudson-Meng) are an awesome alternative.
Toadstool Geological Park Looking down on Fort Robinson from the pine bluffs from horseback. You can do a horseback ride as part of the Ft. Robinson experience.
November 6, 2025 at 2:30 AM
richardfallon.bsky.social
Stumbled into this unusually literal-minded (and suspiciously Victorian-looking) conception of the geologic column as an ionic column constructed out of fossils. It comes from the tear-out sign-up form for two 1983 London conferences on creationism. The ichthyosaur paddle is a neat touch.
November 5, 2025 at 1:40 PM
mapperwocky.bsky.social
To me, it’s being a mathematician applying math to a geologic problem. So yes, almost exactly your description. And it seems to be the way recent geology graduate programs are training people: find a chemistry/math/physics/bio undergraduate and give them a geology problem.
November 9, 2025 at 4:24 PM
uahirise.bsky.social
HiRISE 3D: Chryse Chaos

Our science objective is to document stratigraphic relationships between chaos blocks and adjacent geologic units.

https://www.uahirise.org/anaglyph/ESP_089120_1850_ESP_089265_1850_RED
NASA/JPL-Caltech/University of Arizona
#Mars #NASA #science
November 3, 2025 at 5:02 PM
eric-chris.bsky.social
We just published a new paper in Geosphere that describes a giant landslide deposit that separates Utah Valley from Salt Lake Valley. What do you think?

pubs.geoscienceworld.org/gsa/geospher...
Geologic map of the east Traverse Mountains landslide, Utah.
November 6, 2025 at 4:29 AM
aposthumousmemoir.bsky.social
The actual, geologic floor of Death Valley — the bedrock covered by sediments eroded from surrounding hills — is close to two miles beneath the valley floor.
The geologic history of Death Valley is extremely complex and involves different types of fault activity at various periods, in addition to crustal sinking and even some volcanic activity. Essentially, Death Valley is a graben, or rift valley, formed by the sinking of a tremendous expanse of rock lying between parallel uplifted, tilted-block mountain ranges to the east and west. A type of fault activity called block faulting, in which the movement is predominantly vertical, began to form the valley about 30 million years ago. As crustal blocks sank, they formed the great trough of the valley, and other blocks were uplifted to gradually form the adjacent mountain ranges. As the valley sank, it was filled by sediments that were eroded from the surrounding hills; in the central part of the valley the bedrock floor is buried beneath as much as 9,000 feet (2,745 metres) of sediment. The valley floor has continued to tilt and sink. Death Valley seen from space, courtesy of NASA.
November 9, 2025 at 4:06 AM
bne.es
La #BNE y el Institut Cartogràfic i Geològic de Catalunya han presentado hoy el libro-mapa dedicado al monumental mural de Cataluña realizado en 1687 por Ambrosio Borsano. 📚🗺️
www.bne.es/es/noticias/...
November 4, 2025 at 4:57 PM
paleosol.bsky.social
In GenEd Climate Change, I give 3 exams total. The first deals with geologic systems, the second covers modern climate systems, the third deals with anthro climate change + paleoclimate analogs.

Exam 2 was wild this year: 26% of the class failed, big time.

Some thoughts.
#AcademicSky

1/6
November 6, 2025 at 3:00 PM
luafox.bsky.social
I think this is the only one officially! But yes, the trail generally follows the edge of the most recent glacier in Wisconsin. There’s tons of cool geologic features the glacier left behind so it’s some of Wisconsin’s most beautiful scenery.
November 4, 2025 at 1:34 PM
mineralmatters.bsky.social
Mineral Matters # 867 - Geologic Terminology: Gossan
#mineralmatters #minerals #🧪 open.substack.com/pub/mineralm...
Geologic Terminology: Gossan
Mineral Matters #867
open.substack.com
November 3, 2025 at 12:53 AM
yellowdotstudios.bsky.social
It is amazing that 60 years ago, scientists were so crystal clear that burning fossil fuels was raising Earth's temperature.

And yet thanks to Big Oil's decades of lies, today 40% in the US still don't believe global warming is human-caused or settled science, and 30% don't think it's happening!
PROBABLE FUTURE CONTENT OF CARBON DIOXIDE IN THE ATMOSPHERE We can conclude with fair assurance that at the present time, fossil fuels are the only source of CO: being added to the ocean-atmosphere- biosphere system. If this held true throughout the last hundred years, the quantity of CO: in the air at the beginning of the present decade was about 7% higher than in the middle of the last century (see Table 3). Throughout these hundred years, the rate of fossil fuel combustion, and thus of CO, production, continually increased, on the average about 3.2 percent per year. The amount produced in 1962 was almost 25 times the annual production in the mid-1860's. The rate of increase may be accelerating. During the eight years from 1954 to 1962, the average rate of increase was 5%. POSSIBLE EFFECTS OF INCREASED ATMOSPHERIC CARBON DIOXIDE ON CLIMATE One of the most recent discussions of these effects is given by Möller (1963). He considers the radiation balance at the earth's surface with an average initial temperature of 15°C (59°F), a relative humidity of 75 percent, and 50% cloudiness. We may compute from his data that with a 25 percent increase in atmospheric CO, the average temperature near the earth's surface could increase between 0.6°C and 4°C (1.1°F to 7°F), depending on the behavior of the atmospheric water vapor content. The small increase would correspond to a constant absolute humidity, that is, a constant weight of water in the atmosphere. The larger increase would correspond to a constant relative humidity, that is, as the temperature rose, the water vapor content would also rise to maintain a constant percentage of the saturation value. A doubling of CO: in the air, which would happen if a little more than half the reserves of fossil fuels were consumed, would have about three times the effect of a twenty-five percent increase. CARBON DIOXIDE FROM FOSSIL FUELS-THE INVISIBLE POLLUTANT Only about one two-thousandth of the atmosphere and one ten- thousandth of the ocean are carbon dioxide. Yet to living creatures, these small fractions are of vital importance. Carbon is the basic build- ing block of organic compounds, and land plants obtain all of their carbon from atmospheric carbon dioxide. Marine plants obtain carbon from the dissolved carbon dioxide in sea water, which depends for its concentration on an equilibrium with the carbon dioxide of the atmosphere. Marine and terrestrial animals, including man, procure, either directly or indirectly, the substance of their bodies and the energy for living from the carbon compounds made by plants. All fuels used by man consist of carbon compounds produced by ancient or modern plants. The energy they contain was originally solar energy, transmuted through the biochemical process called photosynthesis. The carbon in every barrel of oil and every lump of coal, as well as in every block of limestone, was once present in the atmosphere as carbon dioxide. Over the past several billion years, very large quantities of carbon dioxide have entered the atmosphere from volcanoes. The total amount was at least forty thousand times the quantity of carbon dioxide now present in the air. Most of it became combined with calcium or magnesium, freed by the weathering of silicate rocks, and was precipitated on the sea floor as limestone or dolomite. About one-fourth of the total quantity, at least ten thousand times the present atmospheric carbon dioxide, was reduced by plants to organic carbon compounds and became buried as organic matter in the sediments. A small fraction of this organic matter was transformed into the concentrated deposits we call coal, petroleum, oil shales, tar sands, or natural gas. These are the fossil fuels that power the world-wide industrial civilization of our time. Throughout most of the half-million years of man's existence on earth, his fuels consisted of wood and other remains of plants which had grown only a few years before they were burned. The effect of this burning on the content of atmospheric carbon dioxide was negligible, because it only slightly speeded up the natural decay processes that continually re- cycle carbon from the biosphere to the atmosphere. During the last few centuries, however, man has begun to burn the fossil fuels that were locked in the sedimentary rocks over five hundred million years, and this combustion is measurably increasing the atmospheric carbon dioxide. In the geologic past, the quantity of carbon dioxide in the atmosphere was determined by the equilibrium between rates of weathering and photosynthesis, and the rate of injection of volcanic carbon dioxide. on an earthwide average, both weathering and photosynthesis must speed up when the carbon dioxide content of the air is increased, and slow down when it is diminished; consequently, over geologic time the carbon dioxide in the air must have risen when volcanic activity was high, and must have gone down when volcanoes were quiescent. On a human scale, the times involved are very long. The present rate of production of carbon dioxide from fossil fuel combustion is about a hundred times the average rate of release of calcium and magnesium from the weathering of silicate rocks. As long as this ratio holds, precipitation of metallic carbonates will be unable to maintain an unchanging content of carbon dioxide in the atmosphere. Within a few short centuries, we are returning to the air a significant part of the carbon that was slowly extracted by plants and buried in the sediments during half a billion years.
November 6, 2025 at 7:33 PM
callanbentley.bsky.social
Siccar Point is a touchstone in the evolution of geological thinking: the spot where a human mind first reeled at the depths of geologic time. Visiting it was profound, connecting across the centuries with James Hutton and John Playfair, who connected across the eons with the age of the Earth. ⚒️
Callan at Siccar Point angular unconformity, wearing a bright orange t-shirt and khaki pants, with his left hand on the graywacke and his right hand on the base of the Old Red Sandstone.
November 1, 2025 at 12:02 PM
brenmccracken.bsky.social
I'm happy to be organizing a panel for ACCUTE 2026 in Montreal titled "Literature and the geo-logics of conquest."

The submission deadline is Friday, November 21. Please share with anyone who may be interested!
accute.ca/2026-call-fo...
Geology and its figures are surfacing across the humanities: fields including political ecology, Black studies, critical Anthropocene studies, and the energy humanities have recently incorporated or interrogated geologic language and methods. Such breadth of engagement with this branch of earth science evinces a recognition of what Kathryn Yusoff names the “grammars of geology”—the figurative and formal techniques that subtend geology’s reproduction of racial capitalism. Meanwhile, geology also circulates through a popular rhetoric that calls upon textuality to make its objects meaningful: Colin N. Waters, chair of the Anthropocene Working Group, notably appealed to literary technique in his invitation to engage sites of geologic significance by “[reading] the stories that they tell you.” What is at stake in this figuration of geology as textual? How can literary studies contribute to a critical unearthing of geology’s grammars? And how might an attention to geology in literature reroute what Tiffany Lethabo King calls the “grammar of conquest” that grids modern relation to dispossession and death? This panel invites papers that address geology’s literary and theoretical figurations with particular attention to their imbrication with histories of racialization and conquest. Possible topics may include: the geologic grammars of postcolonial studies and Black studies; the poetics of ground, earth, or extraction; literature and the metabolic rift; literatures of geology and empire; or geology and deconstruction.
November 3, 2025 at 10:04 PM
atherton.bsky.social
A unique feature about this moment in the end of empire is that the geologic stratum for it will contain the abrupt arrival of 12-foot-tall human skeletons, seen neither before or, when the technology to make them is lost in the calamity, ever since.
October 30, 2025 at 6:27 PM
georgehrab.bsky.social
Hold on to your funicular tickets... Show 940 of The Geologic Podcast talks about uphill vs. downhill. That's right... IT GOES THERE. Check out the controversial take here: bit.ly/49qZgy7
October 30, 2025 at 2:39 PM
millsypop.bsky.social
Walking around my house bra-less putting on deodorant, flossing my teeth and wearing a t-shirt from the last geologic era...
Nothing feels as good as not being visible during a Zoom meeting!
October 30, 2025 at 7:01 PM
hydrogeo.bsky.social
That’s fair. It’s also good to remember the geologic record typically preserves catastrophic events, rather than the usual day to day.
October 30, 2025 at 7:37 PM
rhena.bsky.social
games from the period where everyone was moving to 3D but no one had yet thought of "the player should be able to control the camera, too" and subsequently "we should add some stuff (two joysticks) to the controller" feel like they occupy their own little geologic strata
October 29, 2025 at 6:02 AM
statuslink.bsky.social
Mount Everest : Explore the epic science behind how Mount Everest continues to be sculpted by tectonic uplift, erosion, glaciers, and powerful Himalayan geologic forces. Plate collision, uplift rates, rock metamorphism. #everest.
youtu.be/rdkAs2sAeC4
statusl.ink/mounteverest...
Is Mount EVEREST Growing Right Before Our Eyes?
YouTube video by Soup Sets
youtu.be
October 29, 2025 at 5:59 AM
clflngthjnshrts.bsky.social
I and a small group of my colleagues theorize that the Ghent altarpiece was formed by geologic processes
October 28, 2025 at 5:35 PM