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Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 05/06/2026

A fossilized dinosaur tooth of an indeterminate theropod from the Hell Creek Formation in East-Central Montana, USA. This morphology, likely a premaxillary tooth, lacks serrations on the mesial carinae. #FossilFriday #dinosaur #fossil #paleontology #tyrannosaurid #dromaeosaurid #theropod

Fossilized dinosaur tooth of an unknown theropod showing the lack of serrations on the mesial carinae or cutting edge.

2102

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 29/05/2026

A fossilized dinosaur tooth of a Nanotyrannus sp. from the Hell Creek Formation in Powder River County, Montana, USA. Nanotyrannus is not a true tyrannosaurid but a nanotyrannid eutyrannosaur. #FossilFriday #dinosaur #fossil #paleontology #nanotyrannus #tyrannosaurid #theropod

0124

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 22/05/2026

A mosasaur tooth, possibly Tylosaurus rex from the Ozan Formation in Fannin County, Texas, USA. This marine lizard, the T. rex, is the largest known tylosaurine mosasaur and one of the largest species of mosasaur. #FossilFriday #mosasaur #fossil #paleontology #tylosaurus

Fossilized mosasaur tooth of a Tylosaurus.

051

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 27/03/2026

A group of Permian lungfish tooth plates from the Wellington Formation in Waurika, Jefferson County, Oklahoma, USA. I'm not sure what genus these belong to, but they seem closer to the younger aged Ceratodus than to things like Gnathorhiza. #FossilFriday #fish #lungfish #fossil #paleontology

192

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 20/03/2026

A dinosaur tooth of an indeterminate theropod, possibly a coelurosaur from the Kem Kem Group in Morocco. It's hard to say what this tooth belongs to. Megaraptorans are a possibility, as are dromaeosaurids and basal coelurosaurs. #FossilFriday #dinosaur #fossil #paleontology #theropod

Fossilized dinosaur tooth of an unknown theropod inside of a gem jar.

2317

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 13/03/2026

A worn dinosaur tooth of an indeterminate tyrannosaur, supposedly from the Judith River Formation in Montana, USA. Unfortunately, the provenance for this tooth is absent other than Northern Montana. #FossilFriday #dinosaur #fossil #paleontology #gorgosaurus #daspletosaurus #tyrannosaurid #theropod

Fossilized dinosaur tooth of an unknown tyrannosaur showing much of the enamel worn away.

1112

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 06/03/2026

A dinosaur tooth of a cf. Afrovenator abakensis from the Irhazer Group in Marandet, Aderbissinat, Agadez, Niger. The cookies 'n cream colors can be quite pretty, albeit, the tooth is still fractured like most. #FossilFriday #dinosaur #fossil #paleontology #afrovenator #megalosaurid #theropod

$Fossilized dinosaur tooth of an Afrovenator showing showing fractured enamel.$

061

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 27/02/2026

A dinosaur tooth of an indeterminate tyrannosaurid from the Judith River Formation in Valley County, Montana, USA. The serrations are oddly weakly developed, though it's unclear what that implies. #FossilFriday #dinosaur #fossil #paleontology #gorgosaurus #daspletosaurus #tyrannosaurid #theropod

Fossilized dinosaur tooth of an unknown tyrannosaur showing significant feeding wear towards the tip.

2252

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 20/02/2026

A fossilized partial placoderm head shield from a Bothriolepis canadensis from the Escuminac Formation in Escuminac Bay, Quebec, Canada. Bothriolepis was a highly prolific Devonian aged genus of armored fish found across the world. #FossilFriday #fish #placoderm #fossil #paleontology #bothriolepis

A pair of fossilized fish head shield of a Bothriolepis on original matrix or rock.

070

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 06/02/2026

A pair of fragmentary fossilized teeth of a giant beaver or Castoroides dilophidus from Columbia County, Florida, USA. This extinct beaver genus lived alongside American beavers that are still around today. #FossilFriday #synapsid #mammal #fossil #paleontology #castoroides #beaver #rodent

Fossilized partial mammal teeth of two giant beaver or Castoroides.

0111

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 30/01/2026

Three indeterminate crocodylomorph teeth from the Csehbánya Formation in Veszprém County, Hungary. The teeth possibly belong to either cf. Allodaposuchus sp. or cf. Theriosuchus sp. #FossilFriday #crocodylomorph #fossil #paleontology #allodaposuchus #theriosuchus

Three fossilized unknown crocodylomorph teeth inside of a gem jar.

061

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 23/01/2026

A dinosaur tooth of an indeterminate sauropod, likely a titanosauriform from the Irhazer Group in the Agadez Region of Niger. I'm not entirely sure what it is, but the robust torpedo shaped morphology would suggest a macronarian of some kind. #FossilFriday #dinosaur #fossil #paleontology #sauropod

Fossilized torpedo-shaped dinosaur tooth of an unknown sauropod showing heavy wear towards the tip.

1202

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 16/01/2026

A partial dinosaur tooth of an indeterminate tyrannosaurid from the Two Medicine Formation in Pondera County, Montana, United States. Unfortunately, the mesial carinae is completely worn down. #FossilFriday #dinosaur #fossil #paleontology #gorgosaurus #daspletosaurus #tyrannosaurid #theropod

Fossilized dinosaur tooth of an unknown tyrannosaur showing the tooth tip broken off and enamel worn down with some restoration between the cracks.

2273

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 09/01/2026

A fossilized lungfish of a Dipterus valenciennesi from the Achanarras Limestone Member, Old Red Sandstone at the Achanarras Quarry in Caithness, Scotland. These basal lungfish are found in various Devonian-aged deposits in Europe. #FossilFriday #fish #lungfish #fossil #paleontology #dipterus

Fossilized lungfish of a Dipterus on original matrix or rock.

0398

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 26/12/2025

A fossilized bird jaw of a Dasornis sp. from Oued Zem, Khouribga, Morocco. Pelagornithids like the Eocene aged Dasornis are known as false-toothed or pseudotooth birds for their serrated beaks. #FossilFriday #dinosaur #bird #fossil #paleontology #dasornis #theropod

Fossilized bird jaw of a Dasornis on original matrix or rock showing tooth-like protrusions on the beak.

072

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 20/12/2025

A fossilized lobe-finned fish of an Osteolepis panderi from the Old Red Sandstone near Skinnet Farm, Hill of Forrs, Thurso, Caithness, Scotland. Osteolepidids are more closely related to tetrapods and lungfish than to ray-finned fish. #FossilFriday #fish #fossil #paleontology #osteolepis

Fossilized fish of an Osteolepis on original matrix or rock.

182

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 12/12/2025

A fossilized armored millipede segment of an Arthropleura sp. from the Orzeskie Beds, Upper Silesia Coal Basin, Poland. These giant Carboniferous aged myriapods grew over two meters. The fern genus Zeilleria can also be seen on the slab. #FossilFriday #myriapod #fossil #paleontology #arthropleura

Fossilized Arthropleura on original rock or matrix showing a Zeilleria fern nearby.

175

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 05/12/2025

A dinosaur tooth of an indeterminate saurornitholestine dromaeosaurid, possibly Saurornitholestes langstoni or Bambiraptor feinbergi from the Judith River Formation in Fergus County, Montana, USA. #FossilFriday #dinosaur #fossil #paleontology #saurornitholestes #bambiraptor #dromaeosaurid #theropod

Fossilized dinosaur tooth of a Saurornitholestes or Bambiraptor inside of a gem jar.

1154

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 28/11/2025

A mosasaur tooth of an indeterminate prognathodontin, possibly cf. Thalassotitan sp. from the Peedee Formation in Holden Beach, North Carolina, USA. This robust tooth morph is comparable to Thalassotitan atrox from Morocco. #FossilFriday #mosasaur #fossil #paleontology #thalassotitan #prognathodon

Fossilized mosasaur tooth of a Thalassotitan or Prognathodon showing the tip worn down.

0112

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 21/11/2025

A fossilized crocodylomorph tooth of an Doratodon carcharidens from the Csehbánya Formation in Veszprém County, Hungary. This Cretaceous aged terrestrial ziphosuchian croc had serrated teeth similar to those of theropod dinosaurs. #FossilFriday #crocodylomorph #fossil #paleontology #doratodon

Fossilized crocodylomorph tooth of a Doratodon on original matrix or rock.

171

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 15/11/2025

A dinosaur footprint of the ichnotaxon Eubrontes giganteus from the East Berlin Formation in Connecticut, USA. This Jurassic aged ichnogenus is possibly from Dilophosaurus or a similar species. #FossilFriday #dinosaur #fossil #ichnology #paleontology #eubrontes #gigandipus #dilophosaurus #theropod

Dinosaur footprint or track of an Eubrontes, Gigandipus, or Dilophosaurus on original matrix or rock showing added staining to show clarity.

181

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 07/11/2025

A fossilized crocodylomorph tooth of an Iharkutosuchus makadii from the Csehbánya Formation in Veszprém County, Hungary. Unlike the leaf-shaped teeth of herbivorous crocs like Simosuchus, this genus evolved mammal-like dentition. #FossilFriday #crocodylomorph #fossil #paleontology #iharkutosuchus

Fossilized crocodylomorph tooth of a Iharkutosuchus inside of a gem jar showing feeding wear on the crown.

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Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 31/10/2025

A rooted dinosaur tooth of a Nanotyrannus sp. from the Hell Creek Formation in Carter County, Montana, USA. This unserrated basal morphology was previously known as the tooth taxon, Aublysodon amplus. #FossilFriday #dinosaur #fossil #paleontology #aublysodon #nanotyrannus #tyrannosaurid #theropod

Fossilized dinosaur tooth of a Nanotyrannus or Aublysodon showing all of the root in tact and lacking serrations on the cutting edge.

2102

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 30/10/2025

A dinosaur tooth of a Nanotyrannus sp. from the Hell Creek Formation in Carter County, Montana, USA. This nanotyrannid eutyrannosaur has two species, N. lancensis and N. lethaeus. Welcome back Nanotyrannus. For good this time. #dinosaur #fossil #paleontology #nanotyrannus #tyrannosaurid #theropod

Fossilized dinosaur tooth of a Nanotyrannus inside of a gem jar.

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Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 24/10/2025

A dinosaur tooth of an ankylosaur, either Hungarosaurus tormai or cf. Struthiosaurus sp. from the Csehbánya Formation in Veszprém County, Hungary. Hungarosaurus is known for its long forelimbs. #FossilFriday #dinosaur #fossil #paleontology #hungarosaurus #struthiosaurus #ankylosaur #ornithischian

Fossilized leaf-shaped dinosaur tooth of a Hungarosaurus inside of a gem jar showing some feeding wear.

172

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 17/10/2025

A partial fossilized metatarsal of a theropod, possibly Dzharacursor bissektensis from the Bissekty Formation in Dzharakuduk, Kyzylkum Desert, Uzbekistan. This species was previously referred to Archaeornithomimus. #FossilFriday #dinosaur #fossil #paleontology #dzharacursor #ornithomimid #theropod

Partial fossilized dinosaur metatarsal of a Dzharacursor.

1101

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 10/10/2025

A fossilized osteoderm from a Cretaceous aged softshelled turtle, possibly Khunnuchelys kizylkumensis from the Bissekty Formation in Dzharakuduk, Kyzylkum Desert, Uzbekistan. Other species of this genus also occur in China and Kazakhstan. #FossilFriday #turtle #fossil #paleontology #khunnuchelys

Fossilized softshelled turtle osteoderm or scute of a Khunnuchelys.

1155

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 04/10/2025

Today is the 120th anniversary of the description of #Tyrannosaurus rex and #Albertosaurus sarcophagus in 1905 by Henry Fairfield Osborn, the two species that would define the clade, Tyrannosauridae. A pair of dinosaur teeth, albeit very worn, belonging to these two famous species. 🧪

Pair of fossilized dinosaur teeth of a Tyrannosaurus and Albertosaurus showing both showing the tip missing.

0215

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 03/10/2025

A partial dinosaur tooth of an indeterminate theropod from the Lourinhã Formation in Peniche, Portugal. It's hard to say what it is given its incomplete nature, but it's possibly either Allosaurus europaeus or a non-Torvosaurus megalosauroid. #FossilFriday #dinosaur #fossil #paleontology #theropod

Fossilized dinosaur tooth of an unknown theropod showing the top half of the tooth crown missing.

1103

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 26/09/2025

A rooted dinosaur tooth of an indeterminate pachycephalosaurid from the Hell Creek Formation in Carter County, Montana, USA. Genera include, Pachycephalosaurus, Platytholus, Sphaerotholus, and the controversial Stygimoloch and Dracorex. #FossilFriday #dinosaur #fossil #paleontology #ornithischian

Fossilized dinosaur tooth of an unknown pachycephalosaurid with the root still preserved showing a raised ridge down the center of the crown.

1113

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 19/09/2025

A fossilized crocodilian tooth of a Deinosuchus riogragndensis from the Aguja Formation in Brewster County, Texas, USA. There were multiple species of these giant crocs during the Campanian of North America. #FossilFriday #crocodylomorph #crocodilian #fossil #paleontology #deinosuchus

Fossilized crocodylomorph tooth of a Deinosuchus showing prominent ridges running down the tooth enamel.

182

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 12/09/2025

A dinosaur tooth of an indeterminate hadrosaur, possibly Aquilarhinus palimentus from the Aguja Formation in Brewster County, Texas, USA. Aquilarhinus was previous referred to Kritosaurus and Gryposaurus. #FossilFriday #dinosaur #fossil #paleontology #aquilarhinus #ornithopod #ornithischian

Fossilized dinosaur tooth of an Aquilarhinus or Kritosaurus inside of a gem jar showing pronounced serrations along the cutting edge.

163

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 05/09/2025

A fossilized crocodilian osteoderm of a Miocene aged Alligator sp. from the Fleming Formation near Point Blank, San Jacinto County, Texas, USA. Based on the age, the species could potentially Alligator mefferdi. #FossilFriday #crocodylomorph #crocodilian #fossil #paleontology #alligator

Fossilized crocodylomorph osteoderm or scute of an Alligator (genus).

053

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 29/08/2025

A partial mosasaur jaw, likely Tylosaurus cf. proriger from the Ozan Formation in Northern Texas, USA. This good sized jaw section has a single nice replacement tooth still preserved. A large number of mosasaurs here appear to be Tylosaurus. #FossilFriday #mosasaur #fossil #paleontology #tylosaurus

Fossilized mosasaur jaw section of a Tylosaurus with one replacement teeth still preserved.

052

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 22/08/2025

A fossilized crocodilian tooth of a Brachychampsa montana from the Hell Creek Formation in Baker, Fallon County, Montana, USA. These extinct alligatorids are know for their bulbous or button-like teeth. #FossilFriday #crocodylomorph #crocodilian #fossil #paleontology #brachychampsa

Fossilized button-like crocodylomorph tooth of a Brachychampsa showing some feeding wear.

052

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 15/08/2025

A trilobite fossil of a cf. Nileus sp. from the Pupiao Formation in Yunnan, China. The species of this undescribed Ordovician aged trilobite is unclear, but these are commonly labeled as Nileus transversus or N. transversis by collectors. #FossilFriday #trilobite #fossil #paleontology #nileus

Fossilized trilobite of a Nileus on original rock or matrix showing part of the pygidium or tail section missing.

062

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 08/08/2025

A dinosaur tooth of an indeterminate tyrannosaurid from the Judith River Formation in Havre, Hill County, Montana, USA. Most isolated teeth of Daspletosaurus and Gorgosaurus are indistinguishable. #FossilFriday #dinosaur #fossil #paleontology #gorgosaurus #daspletosaurus #tyrannosaurid #theropod

Fossilized dinosaur tooth of either Daspletosaurus or Gorgosaurus.

193

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 01/08/2025

A fossilized shark tooth of an Otodus megalodon from New Caledonia. Teeth from this locale are dredged from the bottom of the Pacific Ocean and are often extremely worn. This tooth still retains some remnants of its serrations. #FossilFriday #shark #fossil #paleontology #otodus #carcharocles

Fossilized shark tooth of an Otodus or Carcharocles showing significant wear and some modern barnacles attached.

1143

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 25/07/2025

A dinosaur tooth of an ankylosaur, possibly Denversaurus schlessmani from the Hell Creek Formation in Baker, Fallon County, Montana, USA. Not being well versed, the bulbous base could also suggest Ankylosaurus. #FossilFriday #dinosaur #fossil #paleontology #denversaurus #ankylosaur #ornithischian

Fossilized leaf-shaped dinosaur tooth of a Denversaurus inside of a gem jar showing the tip of the tooth worn away.

1122

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 18/07/2025

A dinosaur tooth of an indeterminate theropod, possibly Tyrannosaurus rex from the Hell Creek Formation in Harding County, South Dakota, USA. The oval cross-section suggests T. rex, but it could be something else. #FossilFriday #dinosaur #fossil #paleontology #tyrannosaurus #tyrannosaurid #theropod

Fossilized dinosaur tooth of either an unknown theropod, possibly Tyrannosaurus.

173

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 11/07/2025

A fossilized tooth, possibly a squalodontid or Squalodon sp. from the Bone Valley Member, Peace River Formation in the phosphate mines of Florida, USA. These oddly toothed cetaceans are also known as shark-toothed dolphins. #FossilFriday #synapsid #mammal #fossil #paleontology #squalodon #cetacean

Fossilized mammal tooth of a Squalodon or shark-toothed dolphin.

0133

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 04/07/2025

A partial dinosaur tooth of an indeterminate sauropod, possibly macronarian from the Lourinhã Formation in Lourinhã, Portugal. Like the Morrison Formation, this deposit has many sauropods such as Lusotitan, Oceanotitan, and Lourinhasaurus. #FossilFriday #dinosaur #fossil #paleontology #sauropod

Fossilized dinosaur tooth of an unknown sauropod with part of the root still preserved showing some of the tip missing.

061

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 27/06/2025

A dinosaur tooth of an indeterminate carcharodontosaurid from the Kem Kem Group in Morocco. Carcharodontosaurus and the basal (possibly undiagnostic) Sauroniops may be indistinguishable. #FossilFriday #dinosaur #fossil #paleontology #carcharodontosaurus #sauroniops #carcharodontosaurid #theropod

Fossilized dinosaur tooth of a Carcharodontosaurus or Sauroniops showing a section of the tip missing.

022

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 20/06/2025

A fossilized fish tooth of an Enchodus petrosus from the Taylor Group in the South Sulphur River of Texas, USA. This commonly found extinct genus is sometimes called the "saber-toothed herring", though it is not actually related to true herring. #FossilFriday #fish #fossil #paleontology #enchodus

Fossilized fish jaw section of an Enchodus with one fang-like tooth still preserved.

0124

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 13/06/2025

A very worn dinosaur tooth of an indeterminate theropod, possibly Ceratosaurus sp. from the Lourinhã Formation in Lourinhã, Portugal. The teeth of Ceratosaurus can be quite compressed as seen in this specimen. #FossilFriday #dinosaur #fossil #paleontology #ceratosaurus #ceratosaurid #theropod

Fossilized dinosaur tooth of an unknown theropod, possibly Ceratosaurus showing most of its features weathered away.

161

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 06/06/2025

A pair of indeterminate crocodylomorph teeth, possibly alligatoroid from the Aquia Formation in Belvedere, King George County, Virginia, USA. This Paleocene aged deposit produces a number of crocodylomorph genera. #FossilFriday #crocodylomorph #crocodilian #fossil #paleontology

Pair of fossilized crocodylomorph teeth of an unknown alligatoroid showing multiple ridges running down the crown.

062

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 30/05/2025

A fossilized crocodilian osteoderm, possibly Thecachampsa sericodon from the Ocala Limestone in the Haile Quarry (Haile Sites) of Alachua County, Florida, USA. This specimen was originally found in multiple pieces. #FossilFriday #crocodylomorph #crocodilian #fossil #paleontology #thecachampsa

Fossilized crocodylomorph osteoderm or scute of a Thecachampsa showing multiple repairs and a big hole on the left.

072

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 23/05/2025

A fossilized tooth of a woolly mammoth or Mammuthus primigenius in Cotswold Water Park, Ashton Keynes, Wiltshire, England. Unfortunately, this specimen suffered damage during transport and had to be glued back together. #FossilFriday #synapsid #mammal #fossil #paleontology #mammuthus #mammoth

Fossilized mammal tooth of a woolly mammoth showing some repair.

071

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 16/05/2025

A plesiosaur vertebra of an indeterminate pliosaurid from the Oxford Clay from Oday Common, Abingdon, Oxfordshire, United Kingdom. This deposit contains multiple genera such as Liopleurodon and Pliosaurus making identification difficult. #FossilFriday #plesiosaur #pliosaur #fossil #paleontology

Fossilized plesiosaur vertebra of an unknown pliosaur.

071

Mesozoic Market | Fossil Collector & Amateur Paleontology @mesozoic.bsky.social · 09/05/2025

Partial pair of fossilized fish fin bones of a Protosphyraena sp. from the Niobrara Chalk in Kansas, USA. The distinct saw-like pectoral fins of this Cretaceous aged fish are easily recognizable. #FossilFriday #fish #fossil #paleontology #protosphyraena

Pair of fossilized fish fin bones of a Protosphyraena showing saw-like ridges along the fin.

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