#sediments
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cintylee.bsky.social
A view of the mid-Tertiary andesitic porphyry of Cristo Rey in El Paso, straddling the Mexican-US border. The laccolith intruded into Cretaceous sediments, pushing them apart. @riceeeps.bsky.social @riceuniversity.bsky.social geology field trip to west texas
November 11, 2025 at 4:21 AM
evangowan.bsky.social
Suganuma et al provide a thorough examination of the Holocene collapse of the Lützow-Holm Bay ice shelf in Antarctica. They pinpoint when the collapse happened by investigating the beryllium isotopes. When the bay became open ocean, cosmogenic ¹⁰Be could reach the sediments. doi.org/10.1038/s415...
Antarctic ice-shelf collapse in Holocene driven by meltwater release feedbacks - Nature Geoscience
Early Holocene retreat of an ice shelf in East Antarctica was linked to ocean-driven forcing enhanced by ice-sheet meltwater from adjoining regions, as unveiled through the integration of proxy record...
doi.org
November 10, 2025 at 5:14 AM
hourlycosmos.bsky.social
Bedrock in the Central Peaks of Hale Crater - From UAHiRISE (NASA) (uahirise.bsky.social) - https://flic.kr/p/2fgKvjF
This observation is a long image is entirely over the extensive central peak complex of Hale Crater. Of particular interest are bedrock outcrops and associated fine-grained sediments with different colors. This 153-kilometer diameter crater was named after American astronomer George Ellery Hale. NASA/JPL/University of Arizona www.uahirise.org/ESP_058618_1445
November 10, 2025 at 11:00 PM
johnme23.bsky.social
Freshly exposed: Ah-Shi-Sle-Pah #wilderness, NW #NewMexico

#Scape #EastCoastKin #landscapephotography #hiking #backofbeyond #blackandwhite #erosion #geology #sedimentation
A series of sandstone slabs are eroding out from the surrounding soft sediments in this sloping drainage below a group of reddish cliffs and mudstone mounds. The sky above is blue with a few puffy clouds. Black and white rendition of the accompanying color image.
November 7, 2025 at 5:18 PM
geoshanz.bsky.social
Oooh! This could have some nice insights that run parallel to our new paper (accepted- posting shortly!). Our proxy for Arctic iceberg/ sea ice movement is ice rafted debris (sediments)- new pub constrains IRD events from Barents Sea Ice Sheet during glacial maxima (MIS11-1).
November 9, 2025 at 4:40 PM
vickyveritas.bsky.social
3/3 …the Nonesuch Shale, that has been replaced by native copper. The irregular layers are crossbeds formed as the original sediments were deposited by a current. The White Pine Mine copper mineralization occurred at 1.05 to 1.06 billion years ago. Amazing! Vote copper ore to win the Ore Cup below!
Vote in Ore Cup FINALS — Mineral Cup & Ore Cup
Pick the Ore Mineral of the Year! Voting for Copper vs Molybdenite will remain open for 48 hours. Credit: David M. Maietta and Harold Moritz
www.mineralcup.org
November 10, 2025 at 2:59 PM
obialik.bsky.social
About 33.4 million years ago, one of the major shifts in the Earth system occurred: the Eocene ended, and the Oligocene started. With that, sea level dropped globally, resulting in a massive truncation worldwide, an unconformity in the record. 🧪⚒️

Link: www.sciencedirect.com/science/arti...
a At higher sea-level (late Eocene) conditions, the weathering input is balanced by the burial of CaCO3 in neritic and deep ocean environments (Pacific carbonate compensation depth – CCD: ~4 km). b With early stage of sea-level regression, the enhanced weathering flux of organic carbon and nutrients from terrestrial and exposed marginal marine environments causes transient release of CO2; and together with nutrient-stimulated increase in pelagic primary production, causes a transient shoaling of the CCD (Pacific CCD shoals by ~100–200 m). c Further sea-level fall, reduced shelf area and reduced shallow water carbonate factory (and erosion where exposed) causes an imbalance between sources and sinks of alkalinity, resulting in the long-term enhanced preservation and burial of CaCO3 in deep-sea sediments, and the deepening of the CCD (early Oligocene Pacific CCD: > 4.5 km). Source for figure: https://www.nature.com/articles/s41467-023-39806-6/figures/8
November 8, 2025 at 3:06 PM
hourlycosmos.bsky.social
Churning in the Chukchi Sea - From NASA Marshall Space Flight Center - https://flic.kr/p/284W6ga
Regardless of the amount of winter ice cover, the waters off of the Alaskan coast usually come alive each spring with blooms of phytoplankton. These blooms can form striking patterns of blue and green seawater, such as those visible in this image of the Chukchi Sea acquired on June 18, 2018, by the Operational Land Imager (OLI) on Landsat 8. Blooms are a common occurrence this time of year. But the regularity of the blooms and their simple beauty belie the complexity of this ecosystem. Two main water masses flow from the Bering Strait and enter the southern Chukchi. One type, known as “Bering Sea Water,” is cool, salty, and rich in nutrients. This water fuels most of the phytoplankton growth, primarily diatoms, which are likely the main reason for the colorful green waters pictured here. (Sediments could also be contributing to the bright green areas.) The second mass of seawater is known as “Alaskan Coastal Water,” which is warmer, less salty, and nutrient-poor. Diatom growth is usually lower in these waters, but coccolithophores can do well here. Some areas pictured here could contain this type of plankton, known to impart a milky turquoise hue to the water with their plates of calcium carbonate armor. While experts expect blooms to consistently show up in these waters from year to year, the size is less consistent, and the reason is not clear. Image Credit: NASA/U. S. Geological Survey/Norman Kuring/Kathryn Hansen Read more NASA Media Usage Guidelines
November 7, 2025 at 2:00 AM
oceanhelen.bsky.social
Dr Linda Armbrecht @utas.edu.au giving a keynote at the Dorothy Hill Symposium at UQ. Linda was the recipient of the Dorothy Hill award for Early Career geoscientists for her work in developing the methods for extracting sedaDNA from marine sediments around Antarctica.
November 5, 2025 at 12:29 PM
romtoronto.bsky.social
When fossil fuels such as the coal in this bag are burned, small particles called fly ash are released into the air. Crawford Lake’s sediments capture a dramatic increase in fly ash in the 1950s, coinciding with rapid industrialization locally and globally.
November 4, 2025 at 9:19 PM
gutenberg.org
What really happened on Easter Island? Ancient sediments rewrite the 'ecocide' story

edited by Gaby Clark, reviewed by Robert Egan

phys.org/news/2025-11...

Easter Island at PG:
www.gutenberg.org/ebooks/subje...

#books #earth #environment
RANO RARAKU FROM THE SEA. Title: The mystery of Easter island: the story of an expedition Author: Katherine Routledge Original publication: United Kingdom: Printed for the author by Hazell, Watson and Viney, 1919. The composition features the island’s rugged volcanic formation rising from the shore, rendered in delicate grayscale tones. Two distinct peaks dominate the center of the image: the left slope descends smoothly toward the sea, while the right peak is more sharply defined, showing vertical rock faces and shadowed ridges that emphasize its steepness and texture. The foreground suggests the calm surface of the sea, drawn in gentle horizontal strokes that contrast with the dark, angular shading of the mountainside. The sky is lightly toned, with minimal cloud detail, providing an open and atmospheric backdrop that enhances the sense of isolation and scale. https://www.gutenberg.org/cache/epub/69807/pg69807-images.html#Page_124
November 9, 2025 at 10:55 AM
earthscista.bsky.social
Two great days at the Rock and Spindle – just down the Fife coast from St Andrews – where our first years were exploring a Carboniferous volcanic plumbing system cutting through the swampy deltaic sediments. The weather held until the last hour on Sunday, so we’ll take that as a win! ☔🪨
November 10, 2025 at 1:29 PM
seagullsteph.bsky.social
Happy sunday! I dont know if you will appreciate this as much as i do. A law officer i love says to his angry guys he pulls over as they bitch, "I appreciate your sediments" instead of sentiments. I ask why, he says to subtly let them know they are full of bs and are about to begin sinking. 😆
November 9, 2025 at 5:14 PM
jjmarlow.bsky.social
An excellent guide to carbonate burial dynamics in ocean sediments - the most prolific route of carbon removal from the atmosphere...

www.frontiersin.org/journals/ear...
Frontiers | Controls on the Precipitation of Carbonate Minerals Within Marine Sediments
The vast majority of carbonate minerals in modern marine sediments are biogenic, derived from the skeletal remains of organisms living in the ocean. However,...
www.frontiersin.org
November 3, 2025 at 10:02 PM
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
ednaquaplan.bsky.social
🧬#eDNA reveals the hidden past — from ancient Greenland forests to the last woolly mammoths!
By analysing DNA in sediments, ice & water, scientists uncover 50,000 years of biodiversity change.

🌿🐘 tinyurl.com/3uytdcej

#Genomics #Biodiversity #Science
Ancient and modern environmental DNA | Philosophical Transactions of the Royal Society B: Biological Sciences
DNA obtained from environmental samples such as sediments, ice or water (environmental DNA, eDNA), represents an important source of information on past and present biodiversity. It has revealed an ancient forest in Greenland, extended by several ...
tinyurl.com
November 3, 2025 at 8:45 AM
adamplatform.bsky.social
The aftermath of Hurricane #Melissa in central/eastern #Jamaica observed from space.
The #Copernicus #Sentinel2 captured on October 31st this remarkable image highlighting the discharge of fluvial sediments into the marine environment. #ClimateEmergency
November 1, 2025 at 4:51 PM
1wag.bsky.social
Bottom feeder. Churning up the mud and ingesting toxic sediments.
anita72.bsky.social anita72.bsky.social @anita72.bsky.social · 7d
You can live pretty good on Putin's payroll too, right Benny?
November 4, 2025 at 1:13 AM
petridishes.bsky.social
good I hope you’ll come to share my sediments
October 31, 2025 at 8:21 PM
howdylake.com
Trying to gaslight myself into saying its yummy when it taste like sediments
November 2, 2025 at 7:55 AM
lmcampbell.bsky.social
Next week is the Fall Convocation -- always a great time of noting milestones and celebrating achievements!

This year, it will be Enobong Udoh from our team who will be walking the stage for her @smuscience.bsky.social MSc degree. 🥳🎓
A woman wearing waders standing in a wetland full of pickerelweed with purple blooms. She is standing over a small black-mesh mesocosm, measuring plants inside the mesocosm. She is looking at the camera with a smile, although obviously still focused on her task. A woman with a big smile inside the study room next to the ENVS classroom. There is a whiteboard with a calendar and to-do lists behind her. On the table in front is a cake with "MASTER ENOBONG" decorated on the top which Enobong is about to cut. There are plates, forks and napkins arrayed around her, ready for a lab celebration. Enobong behind a podium, about to give a conference talk. Next to her is a giant projection showing her title slide "Using macrophytes to evaluate the efficacy of an in-situ risk management strategy for wetland sediments impacted by historical gold mines". This is at the @ecotoxcan.ca meeting in Victoria BC last October 2025.
November 7, 2025 at 3:48 PM
huubeggen.bsky.social
No images of Earth were taken from space station #ISS on and around 7 November 2005. So we jump to 7 November 2006. The image shows a mesa landscape just northeast of Fort Stockton in western Texas, USA. Original eol.jsc.nasa.gov/DatabaseImag... @daveatcogs.bsky.social #25YearsOnISS
The image shows a brownish landscape with peculiar shapes and a kind of eye in the centre of the image. The peculiar shapes are the borders of flat soft sediments capped with a layer of harder rock which resists erosion. The soft layers can get eroded sideways and this causes flat plains and isolated hills with steep borders. Images like these often provide an optical illusion. The dark lines in the image are the steep borders which are in shadow. The sunlight comes from the right and the mesas are elevated over the surrounding terrain. Often however the brain sees a reverse relief and lets the mesa look like pits or depressions in stead of mounds and elevated ground.
November 7, 2025 at 7:32 PM
florencehabets.bsky.social
Chouette article ds @liberation.fr sur l'effacement des étangs, pour améliorer la qualité de l'eau, réduire les pertes, favoriser la biodiversité et la circulation des sédiments.
Il insiste sur l'importance de co-construire l'évolution de ces territoires, et la nécessité de communiquer les enjeux
«Les étangs font partie de l’identité locale» : en Bretagne, la bataille fait rage autour des plans d’eau
Du Morbihan aux Côtes-d’Armor, des zones humides sont effacées pour laisser les rivières reprendre leur cours naturel. Mais ces opérations de renaturation se heurtent à l’opposition d’une partie de la...
www.liberation.fr
November 1, 2025 at 2:33 PM
monicamedhist.bsky.social
Oh wow! @johnhawks.net has just singled out this study of pregnancy hormones for a special post on his newsletter! "The widening horizon of molecular biomarkers from ancient bones and sediments may open new doors to the biology of ancient people."
November 1, 2025 at 11:17 PM
helgaastrophysics.bsky.social
Springtime on Mars' Polar Cliff

This image shows a very steep outer scarp of layered sediments at the North Pole. Every spring, when sunlight warms the slopes, avalanche activity occurs.
NASA
November 3, 2025 at 8:39 PM