Mesozoic Market | Fossil Collector & Amateur Paleontology

Fossilized softshelled turtle osteoderm or scute of a Khunnuchelys.

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

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

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. 🧪

Magnified view of the serrations or denticles of a fossilized dinosaur tooth of an unknown theropod.

A magnified view of the distal serrations or denticles. The distal serration density is 17/5mm. The mesial carinae ends half way on this specimen, so likely two thirds the way down if complete. The mesial serration density at the tail end of the carinae is 9/2mm. CBL is 14.2mm, and a CBW of 6.6mm.

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

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

Close up view of a fossilized dinosaur tooth of an unknown pachycephalosaurid showing serrations and a raised ridge down the center of the crown.

The prominent raised ridged down the center of the crown distinguishes pachycephalosaurids from the similarly toothed contemporary basal ornithischian, Thescelosaurus. Size wise, it could lean towards Pachycephalosaurus and Stygimoloch (Dracorex) over the two smaller pachycephalosaurid genera.

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

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

Magnified view of ridges down the enamel of a fossilized crocodylomorph tooth of a Deinosuchus.

A magnified view of the enamel showing pronounced ridges commonly seen in various clades of aquatic predators. This type of enamel seems to differ from those seen in the tooth taxon Deinosuchus rugosus.

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

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

Magnified view of the serrations or denticles of a fossilized dinosaur tooth of Aquilarhinus or Kritosaurus.

A magnified view of the serrations or denticles. I'm not sure if Aquilarhinus has serrated teeth like Kritosaurus navajovius. It is possible that this tooth does still belong to some species of Kritosaurus (or Gryposaurus) just based on this characteristic.

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

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 crocodylomorph osteoderm or scute of an Alligator (genus).

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

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

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

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 dinosaur tooth of either Daspletosaurus or Gorgosaurus showing feeding wear and a large split down the middle of the crown.

The other side of the tooth has a big split down the middle along with some feeding wear.

Fossilized dinosaur tooth of either Daspletosaurus or Gorgosaurus.

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

An interesting new study on these Moroccan turiasaurian teeth.

www.app.pan.pl/article/item...

Magnified view of the carina or cutting edge of a fossilized shark tooth of an Otodus or Carcharocles showing significant wear.

Magnified view of the worn denticles. It's not great, but better than nothing. Otodus megalodon is a very common and prolific shark species in general, but it can very between locales. In some regions like this, acquiring good teeth is quite difficult.

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

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

Close up view of a fossilized leaf-shaped dinosaur tooth of a Denversaurus showing serrations and a protruding bulbous base.

Ankylosaurus magniventris teeth can be identified with a combination of a bulbous base and a prominent center ridge, the latter which is not present in this tooth. While I'm not sure about all tooth positions of Denversaurus, some nodosaurids can possibly have a bulbous base as well... I think?

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

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

Cross-section view of a fossilized dinosaur tooth of an unknown theropod, possibly Tyrannosaurus showing an oval shaped cross-section.

Originally, this specimen was labeled as Nanotyrannus, but those teeth are known for their distinct hourglass-shaped or pinched cross-section. The more oval cross-section is more common in tyrannosaurins like T. rex or Tarbosaurus than earlier tyrannosaurids like Daspletosaurus or Gorgosaurus.

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

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 mammal tooth of a Squalodon or shark-toothed dolphin.

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

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 a Carcharodontosaurus or Sauroniops showing a section of the tip missing.

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

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

Cross-section view of a fossilized dinosaur tooth of an unknown theropod, possibly Ceratosaurus showing a very compressed base.

The CBL is 12.8mm and the CBW is 4.8mm giving it a CBR of 0.37 which seems Ceratosaurus-ish. However, theropod teeth can be very similar to one another, especially those from the Jurassic. Unfortunately, the serrations are completely worn away, even under a scope.

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

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

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

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