timdemko.xyz - Profile | ThreadSky | a Reddit-style client for Bluesky

I like this photo of the current meter setup for measuring velocity profiles in the Mississippi River near Vicksburg, Mississippi, up to 110 ft (33.8 m) deep at 325,000 cfs (McQuivey et al., 1973). Data for a lab this week along with wind velocity profiles over a corn field.

submitted 14 hours ago • 2 comments

Since most news outlets cut their science desks years ago, they might not know that the United States Geological Survey conveniently collects annually updated information on all mined resources. Here's the page for Rare Earths. Click on the links to individual yearly reports.

submitted 21 hours ago • 7 comments

Really cool 10”x10”x7” boulder of breccia that was found in an alluvial fan sourcing its rocks from the Amargosa Chaos near Jubilee Pass in Death Valley, Ca. Interact with the model here:👇🏼 skfb.ly/pu6Pw

submitted 14 hours ago • 1 comment

I know I promised photos. Instead, here’s a phone-based lidar scan of 1.8 billion yr old folded and faulted gneiss in an alluvial fan emanating from the Black Mtns in Death Valley. These were the roots of a Himalaya-like Mtn range associate with Yavapi Orogeny. Interact with model👇🏼 skfb.ly/pu6T9

submitted 15 hours ago • 5 comments

It's heartbreaking to see cancellations like these. I did an REU during my undergrad and gained so much from it! I got to learn about a field not present at my undergrad institution, explore whether geophysics grad school would be a good choice for me, and earn money while doing those things.

submitted 1 day ago • 3 comments

doi.org/10.5194/tc-1... Recent paper from our international team. 3 million years of ice sheet and climate history from below Greenland's ice in a core from 1966. Free to read. US NSF supported research. 🧪❄️💙📚

submitted 1 day ago • 2 comments

link.springer.com/article/10.1...

submitted 1 day ago • 1 comment

Some geological features in Mather Gorge (VA/MD), most notably a series of four lamprophyre dikes cutting through metagraywacke of the Mather Gorge Fm (metamorphosed ~460 Ma, depositional age before that) along a joint set that must have existed by 360 Ma, since the dikes exploit it. ⚒️

submitted 1 day ago • 3 comments

Calcite tufa in concentric rings around a twig. I love seeing some tufa specimens since it covered a volcano I studied. #MineralMonday #GeoscienceBluesky ⚒️🧪

submitted 1 day ago • 4 comments

Here are more pictures I took of Ichnofossils I saw in the sandstone slabs that made up the steps at the baby shower venue I went to today. Many of these are cross-cutting one another. It must have been an active seabed. Some of these look like they were made by arthropods. Possibly trilobites.

submitted 1 day ago • 0 comments

Geology of the Pierre Shale in southern South Dakota and surrounding areas from our WAVP poster on Latoplatecarpus willistoni www.researchgate.net/publication/...

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This was aleady happening for about a generation to a decade depending on the field. Below inflation increases in spending or actual cuts plus not hiring replacements with retirements have had the same effect. Tired of innovative seismologists & tectonicists falling out of the field post-postdoc.

submitted 2 days ago • 2 comments

Good. But what about the less ooh ahhh public lands that are the VAST majority? USFS, BLM?

submitted 2 days ago • 2 comments

Geology is absolutely beautiful. Ripple marks, cross bedding and many more sedimentary features from a solo excursion in 2017. Photos from kata-juta national park #Australia #geology #outback #uluru

submitted 2 days ago • 0 comments

Black smoker chimney sample (sliced in half) from the E/V Nautilus’ onboard collection. There’s also beautiful artwork throughout the ship of some of their dives! If anyone would like full resolution photos for educational purposes, please reach out. Happy to provide them! 🧪🌊

submitted 3 days ago • 0 comments

🧪⚒️ Trace fossils and fossil fragments show animals similar to those seen in the Burgess Shale occupied intertidal mudflats in the middle Cambrian - no direct evidence that they did so when they were exposed, but a fairly harsh environment to tolerate nonetheless.

submitted 3 days ago • 1 comment

For those of you bewildered by the Find-Out stage of FAFO, I just want to let you know that you are welcome here in the America that supports all Americans. Let’s work together to reiterate and uphold our national values.

submitted 3 days ago • 0 comments

🧪⚒️ Vancouver! Did you feel the M4.8 earthquake today? One person described it as "like a plane crashing into the building." The earthquake occurred on a fault in the crust overriding the Cascadia subduction zone. But figuring out where those faults are, and which ones are active, is tricky!

submitted 3 days ago • 1 comment

Taphonomy of organic matter and microbial structures in a mid-Proterozoic and Paleoarchean siliciclastic succession. Dr Brooke Johnson, Université of Liège EAI - European Astrobiology Institute youtu.be/zGYQtPTngOY?...

submitted 3 days ago • 0 comments

M 5.1 earthquake 36 km NE of South Pender Harbour, Canada earthquake.usgs.gov/earthquakes/...

submitted 3 days ago • 10 comments

Some rocks and sand photographed on Mars a few hours ago, and now on your phone.

submitted 3 days ago • 17 comments

A #FridayFold video pan over my office windowsill. A dozen fold samples and various other treasures. ⚒️

submitted 3 days ago • 4 comments

Just minutes from campus, Dunkirk Beach offers a glimpse into the Devonian era—about 400 million years ago! Geology student Jasper Bateman recently explored Point Gratiot in Dunkirk, searching for fossils of fish bones and woody plants as part of his research on local Devonian history. 1/5

submitted 3 days ago • 1 comment

Happy to share the first article published in "Catena" by my post-doc Laura Gedminienė about the climatic trends in the South Baltics during the end- Pleistocene and Holocene. [free access for 50 days] kwnsfk27.r.eu-west-1.awstrack.me/L0/https:%2F... 🧪 #Paleobio ⚒️ #Geology #Climate

submitted 4 days ago • 0 comments

Fresh out of the oven, some new #paleoart for #FossilFriday: mother Coelodonta antiquitatis hurries along her offspring, Bort, who spent too long looking for a personalised novelty licence plate on the mammoth steppe. "Come along, Bort!", she says. #fossil #Iceage #paleontology

submitted 4 days ago • 6 comments

Well, this sucks. #geography #geosky #aag

submitted 4 days ago • 2 comments

For #FossilFriday, dinosaur tracks outside the Glen Canyon Dam visitor center. The footsteps of 170ma Dilophosaurus found in the Kayenta sandstone during the destruction of Glen Canyon. #geology

submitted 4 days ago • 0 comments

Public lands are one of the few remaining great equalizers of America’s increasingly ultra-wealthy-centric economy. This would be the death knell for hunting and fishing access, for hiking, cycling, and other forms of rec. It would be a great betrayal of our obligation as stewards of that land

submitted 4 days ago • 5 comments

⚒️ Long but important quote from this fascinating article on ‘Political Geology’ - our field has a dark history many of us don’t like to reckon with. HT to @arnkeeling.bsky.social https://miningbeyondhotair.org/2025/02/05/what-is-political-geology/

submitted 4 days ago • 3 comments

PLOS remains committed to the principles of #OpenScience: integrity, transparency, inclusivity, and collaboration. Recent policy changes in the U.S. raise concerns about the impact on the global research community and scientific integrity. Read the statement: plos.io/3D4O8cH

submitted 4 days ago • 1 comment

This #fossilfriday i have greatly enjoyed this OA paper on how pterosaur bone helped to design better aerospace materials doi.org/10.1038/s415... The CT methods are state of the art worth reading just for that.

submitted 4 days ago • 0 comments

For #FossilFriday, a probable Early Cretaceous (~125 mya) crustacean burrow system preserved in a fluvial (freshwater river) sandstone in Victoria, Australia, ichnogenus Thalassinoides. What kind of crustacean made it? Probably crayfish. #ichnology

submitted 4 days ago • 0 comments

#FossilFriday An illustration of Mary Anning’s ichthyosaur skeleton appeared in William Buckland’s book Geology and Mineralogy #histsci #sciart #WomenInSTEM 🧪⚒️ paleonerdish.wordpress.com/2018/05/21/m...

submitted 4 days ago • 0 comments

What are some ways you can get a copy of "Mia and the Martians" if you don't want to order on Amazon? 📚 @bookshop-org.bsky.social supports the local bookstore of your choice! 📚 Your local library should have a form to request books to be purchased—then more kids can have the chance to enjoy it! 💖

submitted 4 days ago • 0 comments

"...algal biomass exported to the Neoproterozoic benthos stimulated the ecology of benthic predatory protists under anoxia... enhancing the transfer of fixed carbon and energy to eukaryotes occupying higher trophic levels." www.science.org/doi/10.1126/... 🧪 #Paleobio #EvoBio ⚒️ #Geology

submitted 5 days ago • 0 comments

Genuine question: given US isolationism policies right now, can we trust that archived seismology datasets and critical realtime data streams at the EarthScope (IRIS) Data Center (NSF funded) are going to stay accessible to international scientists in the not too distant future?

submitted 5 days ago • 3 comments

Oviraptor render [ #paleoart | #oviraptor| #dinosaurs | #3Dart | #art ]

submitted 6 days ago • 0 comments

"In these times, it is crucial to reaffirm our commitment to the values that unite us: the unbiased pursuit of scientific inquiry, respectful collaboration across diverse backgrounds, and the unwavering affirmation of basic human decency and integrity."

submitted 6 days ago • 0 comments

🧪⚒️ Permanent ice caps have been quite rare in geological history. This new study suggests that's because you need to right combination of paleogeography, exposed lithology, and plate tectonic configuration, all working in the same direction to reduce atmospheric CO2, to get into an icehouse.

submitted 8 days ago • 1 comment

With a constellation of spacecraft, scientists can tell the full tale of the Sun’s rotations. https://eos.org/articles/watching-a-solar-event-from-all-angles Read more in our March issue: bit.ly/Eos-Mar2025

submitted 7 days ago • 0 comments

Starting to get emails from students who had PhD offers fall through bc of waves hands at everything. I assume this is happening to others?

submitted 7 days ago • 6 comments

More on the cost of doing seismology--anything earthquake related gets expensive really, really fast.

submitted 7 days ago • 2 comments

HiRISE 3D: Layering in Lucus Planum This image shows extensive layering in the southern Medusae Fossae Formation (MFF). Layer thickness and orientation may indicate internal structure of the MFF. www.uahirise.org/anaglyph/ESP... NASA/JPL-Caltech/University of Arizona #Mars #NASA #science

submitted 7 days ago • 0 comments

Serandite NaMn²⁺₂Si₃O₈(OH) Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada FOV = 3.68 mm #1566 NFS #minerals #mineralmonday

submitted 7 days ago • 0 comments

act.npca.org/page/79056/a...

submitted 7 days ago • 0 comments

Brian Gibbs had no clue Friday would be his last day at his dream job. The education technician park ranger at Effigy Mounds National Monument in Iowa reported to work, only to be terminated on despite receiving an exceptional performance evaluation in the fall.

submitted 7 days ago • 296 comments

It's easy to forget that climate is not uniform. Take the so-called Medieval Warm Period (which or Medieval Climate Anomaly in newer literature). Western Europe was warmer, but the Middle East and some Mediterranean coastal regions were cooler. 🌊⚒️🧪 agupubs.onlinelibrary.wiley.com/doi/full/10....

submitted 8 days ago • 0 comments

The horror is over, Green River, specifically the Fossil Butte member is done! The Dawn over Eocene fossil lake reveals WAY too many organisms. #paleoart #sciart #paleostream

submitted 8 days ago • 5 comments

Our opinion piece in our local newspaper - Cutting funding for science in Arizona hurts our economy and our future 🌐🧪🧮🌾 tucson.com/opinion/colu...

submitted 8 days ago • 6 comments