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@coastalpaleo.bsky.socialSep 25, 2026, 6:28 PM

#fossilfriday An example of why the ANSP and its collections must be saved. Atlantochelys mortoni, a giant protostegid sea turtle - named in 1849 by Agassiz based on the proximal humerus fragment. In 2012, someone found a large distal humerus that FIT ONTO THE SAME BONE in ANSP collections. 1/ 🦖🧪

The reunited humerus of the gigantic sea turtle Atlantochelys, on display in a museum: you can clearly see the break that happened sometime prior to the 19th century.
@thammerich.bsky.socialSep 25, 2026, 6:25 PM

#FossilFriday 🧩🧩 Completing the picture!

🐚 Last week we looked at a fragment of Pleuroceras spinatum.

👇 Belows illustration shows where it fits: the outermost and youngest part of the ammonite shell, formed during its final stage of growth.

#Fossils #Paleontology #Geology #EduSky

Graphic comparing a fossil fragment to a living creature. At the bottom, a grayscale photo shows a curved, ribbed ammonite shell fossil fragment. A white arrow and lines point upward to a colorful artistic reconstruction of the living ammonite, featuring a reddish-brown spiral shell and a squid-like body with tentacles and an eye extending from the opening. Infographic illustration created and designed by Thomas Hammerich (including photography of Pleuroceras spinatum fossil fragment). Living Pleuroceras spinatum illustration by Paleoartist & Scientific Illustrator Kōhei Futaka, X: @_HETAKA (License: Wikimedia Creative Commons Attribution 4.0 International).
@flynnpaleo.bsky.socialSep 25, 2026, 5:42 PM

Not often fossil plants get reconstructions but part of the new New Mexico Musuem of Natural History and Science exhibit on the early Paleocene San Juan Basin has reconstructed early Paleocene sycamore leaves based on specimens from my dissertation! #FossilFriday #Paleobotany

Reconstructions of early Paleocene scyamore leaves from northwest New Mexico showing a large terminal and two small lateral leaflets of the plant.Reconstructed early Paleocene sycamore tree and early primate at the New Mexico Musuem of Nature and Science. Small brown mammal resting on a limb of a white and grey tree with silk leaves.
@thepalass.bsky.socialSep 25, 2026, 5:38 PM

A new quasipetalichthyid placoderm from the Middle Devonian of China onlinelibrary.wiley.com/doi/10.1002/... #PapersinPalaeontology #FossilFriday @morphobank.bsky.social

Upper left: photograph of fossil specimen IVPP V26687, the placoderm Yipetalichthys maxiongensis, a natural mould of the dorsal part of the endocranium, preserving only a portion of the preorbital plate. Scale bar at lower right of photograph is 10 mm. Lower right, interpretive line drawing. Red rectangle in lower left corner is a cover image from the journal Papers in Palaeontology.
@asherelbein.bsky.socialSep 25, 2026, 4:52 PM

It's #fossilfriday! Here's a guy from HOW TO SURVIVE PREHISTORY: Arthropleura, a (probably!) herbivorous millipede relative that roams the coal forests of Carboniferous Scotland.

Survival Verdict: YES. It's got a nasty nip, but we feel if you get bit, you have it coming.

A large, flat green millipede of unusual size crawls through a Carboniferous swamp forest, with some tiny tetrapods crawling on its back. Art by Stieven Van Der Poorten, from HOW TO SURVIVE PREHISTORY
@cisneros.bsky.socialSep 25, 2026, 4:24 PM

Estas duas mandíbulas encontradas a mais de 200 km de distância, no interior do Maranhão, pertencem à mesma espécie Tanyka amnicola, que viveu antes dos dinossauros.
#FossilFriday
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@cenofreak88.bsky.socialSep 25, 2026, 4:15 PM

#fossilfriday still mulling over doing a texas fossil book. So here's another Texas fossil. This is a partial shell of an alligator snapping turtle. At Waco Mammoth National Monument.

#wacomammothnationalmonument #prehistorictexas #iceage #snappingturtle

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@paleosol.bsky.socialSep 25, 2026, 4:05 PM

For this #FossilFriday, here is the bottom of a thin, little turbidite deposit. The sole marks include tool marks from nautiloids, with at least one visible at the end of the tool mark.

The bottom of a gray rock (lithic wacke) with grooves all over it, mostly trending from upper right to lower left. These are tool marks made by nautilus shells scraping the sea floor.Close up photo of a tool mark with a nautilus shells scraping impression at the end of it (yellow arrow).
@uomnch.bsky.socialSep 25, 2026, 4:01 PM

Fall's in the air! These tiny acorn fossils were found near Cape Blanco, Oregon and are at least 15 million years old. #FossilFriday🧪 🏛️

A small specimen box with a tag of handwritten text with the genus name and a piece of light beige rock (about 1.5 inches in diameter) with a tiny tiny print of an acorn in the center. A close up on the rock with a tiny tiny print of an acorn. From this close, it looks almost like an inked stamp.
@dinostalgia.bsky.socialSep 25, 2026, 3:48 PM

I wrote about those antediluvians in The End of Oak Street for @lareviewofbooks.bsky.social. Thanks to @sayanniething.bsky.social for letting me get a little weird with the Michigan of it all! Some general spoilers, but only one specific one re: fate of the dog. #FossilFriday
tinyurl.com/dinostories

@paleosoc.bsky.socialSep 25, 2026, 3:41 PM

Happy #FossilFriday!!🌲

🌍Here we have MacCulloch’s Fossil Tree from the Isle of Mull in Scotland!

📸Thank you to Ruaridh Alexander for sending us this fossil!

Submit your fossils here: tinyurl.com/PSfossilfriday🔗

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@amypteride.bsky.socialSep 25, 2026, 3:30 PM

What time is it? It’s #Cheliceratime & #Fossilfriday !
Today in Cheliceratime an extinct scorpion from the Eocene of Ukraine!

All the basic infos are here but if you want to learn more, there’s more in the thread below!⬇️🧵

#scorpion #arachnid #eocene #paleoart #amber #sciart #bugsky #invert

Found in a chunk of Ukrainian amber, this scorpion is a member of a genus found across the eocene european ambers, and was the first fossil scorpion named in Ukraine. Size : 2-ish cm of body length Time period : Late Eocene Paleoart speculativometer : Almost a carbon copy The animal drawn is a brown to orange scorpion viewed from above
@captainfossil.bsky.socialSep 25, 2026, 3:28 PM

For #FossilFriday: my first-ever visit to the Academy of Natural Sciences in Philadelphia, which is slated to close permanently this weekend unless some sort of miracle occurs. I'm thrilled to finally be here after a lifetime of wanting to visit, but heartbroken at the circumstances for my trip. 🦖🧪

Cast skeleton of Tyrannosaurus rex in the main gallery of the Academy of Natural Sciences in Philadelphia
@earthsciweek.bsky.socialSep 25, 2026, 3:20 PM

All #fossils are rocks, but not all #rocks are fossils 🪨🦴

Meet coquina, coal, & banded iron formation 👋

🔗 Head to bit.ly/coquina-rock, bit.ly/coal-rock, & bit.ly/bif-rock & tune in next week for another #FossilFriday from the Paleo Research Institute 👉
digitalatlasofancientlife.org/vc/

#Fossil

@ichnologist.bsky.socialSep 25, 2026, 3:15 PM

For #FossilFriday, a modern-ancient pair of clam locomotion traces: a circular depression made by an incongruous ark (Anadara brasiliana) at low tide on Sapelo Island (GA), & natural cast of a similar trace in the Pennington Fm. (~325 mya), with both likely symbolizing how many of us feel lately. 🧪🪨

Two photos side-be-side, with the left photo showing dark-red clam in a circular depression (mmmm..."doughnut") on a sandy surface, with caption saying "Bivalve locomotion trace at low tide, Sapelo Island," and the right photo showing an ochre-gray rock surface with a similar circular structure poking out as a natural cast (on the bottom surface of a sandstone), and a caption saying "Natural cast of bivalve locomotion trace from the Pennington Formation (Carboniferous), Georgia.
@moodogpress.comSep 25, 2026, 3:09 PM

“Cut from two slabs of Portland brownstone, the grave bears dinosaur footprints, tree trunk molds, and the carved phrase ‘Testimony of the Rocks,’ the title of a book by Scottish geologist Hugh Miller.”

#fossilfriday