Prof. Juan Cisneros ⚒️🐉

Mounted skeleton of fossil Inostrancevia with its body facing left. It’s skull shows large saver like teeth. It stands on a bed of shale fragments on a plinth with red plexiglass behind it. At the Royal Ontario Museum.

The fierce carnivore Inostrancevia is one of the species of synapsids that went extinct in the Great Dying, known as the Permian-Triassic Extinction event. #FossilFriday ⚒️🧪

Isolated teeth of Erythrosuchus africanus from the collections of the Natural History Museum UK.

The tip of the snout of Erythrosuchus africanus from the collections of the Natural History Museum UK.

A couple snapshots of an ancient apex predator for this #FossilFriday - presenting the fossil teeth & snout of an #Erythrosuchus africanus, the big-headed, hypercarnivorous archosauromorph from the Early-Mid #Triassic of South Africa 🇿🇦

#Paleontology #Science

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Tracks from a comprehensive site: https://digsfossils.com/fossils/footprints_ct_portland.html Don't miss the "open drawer" to the left of the page. Toggle between time eras, rich in knowledge, a delight to browse, think, learn. Also see: https://digsfossils.com/fossils/footprints_ct_new-haven.html

📷 digsfossils.com/fossils/foot...

#FossilFriday

(Details about each is below the images. Portland Formation, CT.)

Portland, Connecticut--where a visitor can find chunks of fossil-bearing stone along some yards in town. And view quarries.

a portrait of diabloceratops

a partly reconstructed diabloceratops skull, as the holotype is incomplete

happy #fossilfriday! this is diabloceratops, a ceratopsian from the late cretaceous. named in 2010, it is one of the oldest ceratopsids in the fossil record, and is mostly considered a basal member of the clade centrosaurinae
(art by andrey atuchin)

Happy #fossilfriday did ypu know Stegosaurs, means "roofed lizard".

The next time you visit a museum, consider the fact that the Stegosaur's plates are suspended above the skeleton. This is due to their position in life being attached to the animals skin and not directly the skeleton.

#dinosaurs

Foto mostrando um pequeno galho fossilizado, de cor laranja-marrom, dentro de uma laje de rocha amarelada.

Um galinho de Brachyphyllum, um tipo de araucária que viveu no Nordeste há +100 milhões de anos. #FossilFriday

Uma planta que todo mundo deveria ter no quintal. Cresce rápido e fácil, dá pra preparar de tantas maneiras, substitui espinafre e couve.

Painterly hour long digital sketch of the massive ichthyosaur in cool ocean waters with much smaller ammonites swimming past.

#Paleoctober2025 day 6 paleoart sketch of the giant Late Triassic ichthyosaur Ichthyotitan.

#Paleoctober #Paleoart #ichthyosaur #Ichthyotitan

O Piauí esconde florestas petrificadas -sim, isso é um tronco de milhões de anos- como nenhum outro estado do Brasil. Dia mundial da geodiversidade UNESCO. #geodiversityday

Os de Mata são triássicos, os nossos são permianos (+antigos). Os nossos são maiores, como se pode ver na foto. A diferença de Mata, muitos dos nossos troncos estão na posição vertical, ou seja, em posição de vida. Mas os de Mata são bem interessantes e representam espécies diferentes das nossas.

O Piauí esconde florestas petrificadas -sim, isso é um tronco de milhões de anos- como nenhum outro estado do Brasil. Dia mundial da geodiversidade UNESCO. #geodiversityday

O rei dos mares jurássicos.

art depicting megatherium standing in a rugged landscape, with a snow-capped mountain in the background

a skeletal mount of megatherium standing on its hindlegs

my friend @gulop1th3cuz.bsky.social has asked me to write a thread about his favourite extinct animal, the giant ground sloth megatherium, for his birthday! happy birthday gulo 🥳
(art by @haiderjaffri.bsky.social)

Fui fazer uma visita domiciliar para paciente acamado e encontrei essa lindona no quintal deles.

Welcome to the first instalment of #gomphtober2025 where we spotlight gomohotheres and their relatives. Kicking things off is Stegomastodon Arizona from the pliocene of Arizona.

#fossilfriday #smithsonian #nationalmuseumofnaturalhistory #elephant #fossil #prehistoricarizona #paleontology

A partial skull of a small baleen whale; it is about a meter long, light brown in color, with a long blowhole and a narrow, pyramidal braincase with high muscle attachment crests and a large eye socket. It's sitting on a white sheet with scale bars next to it.

#fossilfriday The beautiful skull of the dwarf baleen whale Herpetocetus bramblei (Cetotheriidae) I discovered and excavated as an undergrad from the 5-6 myo Purisima Formation near Santa Cruz, California. Now in @ucmpberkeley.bsky.social collections!

Replica of the Tambatitanis, showing its preserved parts.

Skeleton of Tambatitanis

#FossilFriday Tambatitanis skeleton at the Tamba Dinosaur Museum, Japan

Gigantic skeleton of a gator in the museum atrium with curator for scale

It's the first ##FossilFriday for Croctober! Here is the prototype reconstruction of Deinosuchus schwimmeri, from the late Cretaceous of Georgia and other places around the south.

I finally got a Pic with me in it for scale so you can see just how huge this dead gator was.🐊🧪

A gray white reptile skull in a black sand table

a pretty skull of the phytosaur Redondasaurus collected from the Navajo Nation and housed at @museumofnaz, on loan to PEFO #FossilFriday 🦖🧪

#FossilFriday: Velociraptor mongoliensis, a dromaeosaurid theropod from the Upper Cretaceous of Mongolia. Though famous for its appearances in the #Jurassicpark and #jurassicworld films, the Velociraptor in those movies is actually modeled after Deinonychus, a much older theropod.

#FossilFriday ‘Black Beauty’, one of the smallest-known specimens of Tyrannosaurus rex, displayed at The Royal Tyrell Museum in Calgary, Alberta.
wp.me/p3ihHu-1MX

A picture of a fossil sea star with a label that says "LOOK but don't EAT! Deanna Graham's Hornby find."

Same sea star, just at a closer distance so you can see the details better.

#FossilFriday

Fossil sea star 🌊⭐️, found by Deanna Graham on Hornby Island in British Columbia.

It’s #FossilFriday and I’m spotlighting Dunkleosteus!

Dunkleosteus is a prehistoric fish called a placoderm that lived in the Devonian, millions of years before the dinosaurs. It had tough armor and self-sharpening jaws. This one is from Charleston, SC.

Esses eu quero longe.

A foto mostra o meu rosto do lado esquerdo (usando uma camiseta preta), e um crânio de um gorgonópsio do lado direito, sobre uma mesa de laboratório. O crânio é cinza e são visíveis os dentes, incluindo um grande canino. A parede do fundo é branca. Foto feita no Museu Sul-Africano Iziko, em Cidade do Cabo em 2022.

Esta é com um gorgonópsio. Pense num carnívoro do tamanho de um urso, com dentes de sabre, rondando as planícies africanas muito antes que os dinossauros. Vontade de descobrir um destes no Brasil. #FossilFriday

Two lower jaws of a mastodon in a museum display. The teeth have very high cusps. In the corner is a skeletal of a mastodon next to a person, showing that the person roughly comes up to the mastodon's shoulder.

Did you know that mastodons used to live in Alberta? This jaw was found in Edmonton and is currently housed at the Royal Alberta Museum. Mastodon are relatives of elephants and have very distinctive jaws and teeth.

#fossilfriday #palaeontology #paleontology #mastodon #fossils #mammals #alberta

For #FossilFriday, we have a fossil from our editor Verónica Vennari.

This is Argentiniceras noduliferum, an Early Cretaceous ammonite & index fossil specimen from the Vaca Muerta Formation in the Neuquén Basin, Argentina.
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A shell of a bivalve mollusc that was found in 1952 in the valley Qilakitsoq on the Nuussuaq peninsula in western Greenland. The scientific name of these bivalves is Inoceramus steenstrupi. They lived between 83 and 63 million years ago. These are the largest bivalves ever to exist. It is thought that they lived in an oxygen-poor environment and that they layed unattached on the sea floor filtering plankton and detritus from the water. The shell is 178 cm (70 inch) long. The other half of the bivalve is in the Geological Museum of Copenhagen. ___ On display at the Greenland Institute of Natural Resources. Link to this new Institute filled with many hallway displays at www.natur.gl/ hey now, "moi" for scale and a line-up of 2014 Nuuk Geoscience Workshop geologists waiting for their turn with the mighty mollusk. The Nuuk display is geotagged instead of the Cretaceous fossil-bearing rock formation on the opposite side of Greenland. Photo by H. Steenkamp with permission for my photo-shop'd posting.

For #FossilFriday, meet Inoceramus : the largest bivalve to ever exist. This genus lived in the Cretaceous seas of North America and Europe.

This one is 178 cm long. And look at these rings ! It must an amazing palaeoenvironmental recorder to work with 😍

#PaleoSky 🦑 🧪 ⚒️

#FossilFriday An unused view of the bizarre tooth-whorl of the Permian cartilaginous fish Helicoprion taken for ‘Fossils. The Essential Guide’.

A foto mostra o meu rosto do lado esquerdo (usando uma camiseta preta), e um crânio de um gorgonópsio do lado direito, sobre uma mesa de laboratório. O crânio é cinza e são visíveis os dentes, incluindo um grande canino. A parede do fundo é branca. Foto feita no Museu Sul-Africano Iziko, em Cidade do Cabo em 2022.

Esta é com um gorgonópsio. Pense num carnívoro do tamanho de um urso, com dentes de sabre, rondando as planícies africanas muito antes que os dinossauros. Vontade de descobrir um destes no Brasil. #FossilFriday