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@naturenickpics.bsky.social Oct 9, 2026, 6:10 PM

A cast of UALVP55700, a Saurornitholestes specimen representing the most complete dromaeosaurid yet known from Alberta. I’ve seen the original specimen up close but this cast does it justice. From the tip of the snout to the base of the tail this specimen is pretty much all there #FossilFriday

@coastalpaleo.bsky.social Oct 9, 2026, 5:33 PM

#fossilfriday A decent sized juvenile tooth of the megatoothed shark Carcharocles chubutensis on the beach at Crab Bank, a fossil-rich sand bar in Charleston harbor (SC), found while working on the boat with Ashby Gale of Charleston Fossil Adventures in fall 2023.

A large triangular shark tooth with a thick root and a serrated crown; the crown is dark bluish gray and the root is black. It's sitting on a fine white sand beach.

@thepalass.bsky.social Oct 9, 2026, 4:18 PM

Reconstruction of the canopy of the iconic Lepidodendron aculeatum, based on new articulated fossils from the Bashkirian (Pennsylvanian) of Hagen-Vorhalle, Germany onlinelibrary.wiley.com/doi/10.1002/... #PapersinPalaeontology #FossilFriday

Upper left: Photograph of an articulated branch system of Lepidodentron aculeatum from the Bashkirian (Pennsylvanian, upper Carboniferous) of Hagen-Vorhalle, Germany (WMNM P85752). The specimen is approximately 350 cm long and about 200 cm wide (scale bar on the right is 100 cm).
Lower left: Enlargement of part of the branch system: second ramification of the right main branch. Scale bar in lower right corner of photograph is 1 cm.
On the right: an artist's reconstruction of one interpretation of Lepidodentron aculeatum (illustration copyright Stefan Sølberg; Mørkøv, Denmark, 2026).
Red rectangle at bottom centre is a cover image from the journal Papers in Palaeontology.

@amypteride.bsky.social Oct 9, 2026, 3:31 PM

But, before starting, there's something I'd like to say on the Crato Formation's fossils for #Fossilfriday.

#Cheliceratime
2/4

Today's species comes from the Crato Formation, a Brazilian geological formation from which incredible fossils have historically been stoled from Brazilian people by European countries & plunderers. There are many other similar situations like this across the world, paleontology's history is plagued by colonialism & neo-colonialism, but the Crato Formation is one of the more accessible and documented cases to talk about right now.

Crato’s fossils are often seized by customs, and several specimens have been at the center of juridic fights with European museums refusing to give fossils back to local communities & scientists, infantilising them and going against basic human dignity and respect for heritage. Paleontologists have a role to play in all of this, and more & more people act to ensure locals have a central part in all of this.

Mark my freaking word:
FOSSILS & COOL ROCKS WILL NEVER BE WORTH MORE THAN RESPECTING OTHERS.

Science helps us to understand the world, and to do so we always make choices on what we talk about or what we decide to test. Choices affecting others, choices showing how we view human interactions. Political choices. Science has always been political, and it's up to all of us to make it better and not continue to fund human suffering.

And I frankly don't give a sh*t if you disagree. Human lives, basic rights & dignity aren't up to debate. And I'll include something like that in future posts each time it's needed.

@amypteride.bsky.social Oct 9, 2026, 3:30 PM

What time is it? It’s #Cheliceratime, #Fossilfriday & #Arachtober !
For this triple occasion, we're talking today about a cretaceous vinegaroon!

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

#cretaceous #paleoart #arachnid #sciart #bugsky
1/4

This vinegarroon is one of the few named species of this order from the entire Mesozoic era. It already looks quite modern in every details, and shares a lot of features with the current vinegarrons living in the Americas.

Size : 12-ish cm of body length
Time period : Early Cretaceous
Paleoart speculativometer : Few missing details

The animal drawn is a vinegaroon, an arachnid looking a bit like a scorpion with long thin first legs used as antennae

@jdpardo.bsky.social Oct 9, 2026, 3:13 PM

I suppose it's #fossilfriday so here's the skull of the Permian coelacanth Spermatodus from Texas, courtesy of the AMNH.

@mosasaurologist.bsky.social Oct 9, 2026, 2:44 PM

Today's #FossilFriday post is again inspired by the imminent closure of the Sternberg Museum. In late 2011 we were again called out to assist in a Kansas project, this time a small version of a large sea turtle called Protostega

Mike Triebold, Jacob Jett (with jackhammer) and me (with shovel)taking down overburden from the site

@deadbovids.bsky.social Oct 9, 2026, 2:30 PM

Deciduous pemolar of a horse from 1.5 million years ago in Kenya for #FossilFriday

White tooth with black lines and a complex surface, held in a hand

@ctenophoresrock.bsky.social Oct 9, 2026, 2:14 PM

TIL about #FossilFriday ⬇️

@cranialoraptor.bsky.social Oct 9, 2026, 2:12 PM

＃金曜日だから化石貼る
 ＃FossilFriday
アキシマエンシス及び同館企画展示「アキシマクジラ化石発見65周年記念展示」〜過去と未来をつなぐアキシマクジラ〜より、アキシマクジラEschrichtius akishimaensis。
多摩川からこんなにも大きく、完全度の高いクジラが出てるというのがすごい。しかも現生ヒゲクジラの中でもとりわけ特徴的な種の1つであるコククジラと同属だというのだから。

@earthsciweek.bsky.social Oct 9, 2026, 2:04 PM

#NationalFossilDay is NEXT WEDNESDAY! 🦴🥳🦖🪩

We hope this video gets you excited to protect #PublicLands & celebrate #EarthScienceWeek with us! 🫶🌎

🔗 Head to bit.ly/ground-sloth-claw & stay tuned for another #FossilFriday after Earth Science Week 👉
digitalatlasofancientlife.org/vc/

#Fossil #Sloth

@extinctmonsters.bsky.social Oct 9, 2026, 2:01 PM

In 2019, NMNH debuted new casts of the Stegosaurus and Ceratosaurus skeletons originally collected by Marsh’s teams. Ceratosaurus was casted and assembled in-house, but Stegosaurus was made by RCI. Getting them to fight took great care, and some cardboard stand-ins. #FossilFriday

Stegosaurus cast skeleton with head down and tail swinging. In an empty room with green spotlight

People make adjustments to a cast Ceratosaurus skeleton propped up on a table

A cardboard stand-in Ceratosaurus alongside finished Stegosaurus cast in a workshop

Final display. Ceratosaurus is on its back, limbs pinwheeling, about to be finished off by Stegosaurus

@publicuniversal.bsky.social Oct 9, 2026, 1:29 PM

#fossilfriday lignite and possible branch cast from the early Cretaceous of Maryland.

@cisneros.bsky.social Oct 9, 2026, 1:11 PM

Esta é Timonya, um anfíbio que viveu antes dos dinossauros em Timon, MA. O crânio mede 4cm, seus braços e pernas eram diminutos (consegue ver os ossinhos dos dedos no lado esquerdo?) e ela deveria passar a maior parte do tempo dentro d'água.
#fossilfriday

@esconi.bsky.social Oct 9, 2026, 1:00 PM

Fossil Friday #338: Braceville Surprise! #fossils #paleontology #MazonCreek #FossilFriday #stigmaria #lepidodendron #pennsylvanian #carboniferous

Jeff Allen recently sent us photos of a fossil he found at Braceville. The specimen…

https://esconi.org/2026/10/fossil-friday-338-braceville-surprise/

@thepalass.bsky.social Oct 9, 2026, 12:53 PM

Fossil wood reveals climate stress & fungal decomposition in Late Triassic forests in central Europe onlinelibrary.wiley.com/doi/10.1002/... #FossilFriday #PapersinPalaeontology

Circular schematic diagram summarising anatomical, dendrochronological and taphonomic evidence from the Lowenstein Formation (Norian, Bavaria). AT the top in blue, tree height is estimated at around 43 m. Next clockwise, in red, growth rings suggest alternating wet and dry seasons, but also episodic drought recorded by false rings. In green on the left, evidence of fungal decay (white rot and brown rot) suggest post-mortem saproxylic activity, causing decay of wood and nutrient recycling. All of this evidence suggests long-lived trees (over 500 years old) living in a dynamic climate-sensitive continental forest.
Red rectangle in lower right corner is a cover image from the journal Papers in Palaeontology.

@paleoadiel.bsky.social Oct 9, 2026, 12:45 PM

#FossilFriday student highlight! 😀 Easten Jenn is an intern in the UAMRC paleontology collection with me this semester. One project is cleaning and piecing together bones of Alabama's state fossil, the Eocene whale Basilosaurus cetoides! 🐋 Here are some of the ribs he worked on.

Easten Jenn with Eocene whale Basilosaurus cetoides rib bones he worked.

@mmarcosaurus.bsky.social Oct 9, 2026, 12:34 PM

Carnotaurus sastrei (replica)
At the Zoology Museum of the University of São Paulo (USP)
#FossilFriday

@dr-crocogator.bsky.social Oct 9, 2026, 12:24 PM

Happy #FossilFriday! We spent the weekend at the annual show of the Minnesota Mineral Club, and boy did we bring a lot from the Science Museum of #Minnesota! A 24 foot table display of #dinosaurs 🦖, #crocodiles 🐊, Giant Beavers 🦫, shelly sea creatures, and even 2 billion-year-old bacteria traces!

@arctomet.bsky.social Oct 9, 2026, 12:19 PM

#FossilFriday Rutiodon carolinensis, specimen AMNH FARB 1 (yes, literally the first fossil reptile in the the catalogue of the @amnh.org )

Skeleton of the long-snouted phytosaur Rutiodon carolinensis face on, its long slender jaws gaping.