Mesozoic Market | Fossil Collector & Amateur Paleontology
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mesozoic.bsky.social
Mesozoic Market | Fossil Collector & Amateur Paleontology
@mesozoic.bsky.social
440 followers 580 following 480 posts
Fossil collector & amateur / hobby paleontology of dinosaurs & other prehistoric fauna. Not a certified paleontologist. 化石コレクター
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Specimens shown are primarily for show & NOT for sale or trade.
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Some excess fossils for sale @ https://mesozoicmarket.com
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mesozoic.bsky.social
A magnified view of the crown, albeit very worn, showing the molar-like morphology of the tooth. This is one of the weirdest archosaur teeth around as most herbivorous species tend to develop leaf-shaped teeth than the mammalian style dentition seen in Iharkutosuchus.
Magnified view of a fossilized crocodylomorph tooth of a Iharkutosuchus showing feeding wear on the crown.
November 7, 2025 at 8:16 PM
mesozoic.bsky.social
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.
November 7, 2025 at 8:11 PM
mesozoic.bsky.social
While unserrated premaxillary teeth were supposedly an ontogenetically variable character, proposed to be found in young Gorgosaurus, recent studies on Nanotyrannus by Zanno and Napoli 2025 have shown this may not be the case. Which may mean they belong to Nanotyrannus lancensis and N. lethaeus.
Close up view of a fossilized dinosaur tooth of a Nanotyrannus or Aublysodon showing the lack of serrations on the cutting edge.
October 31, 2025 at 3:34 PM
mesozoic.bsky.social
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.
October 31, 2025 at 3:32 PM
mesozoic.bsky.social
Comparison with what I believe is a true juvenile young Tyrannosaurus rex (right). While tyrannosaur teeth are very similar to one another, Nanotyrannus teeth are distinguished from T. rex by the hourglass (or figure eight) shape of the cross-section opposed to being oval or round in tyrannosaurins.
Fossilized pair of dinosaur teeth of Nanotyrannus and a juvenile Tyrannosaurus. Cross-section view of a fossilized dinosaur tooth of a Nanotyrannus and a Tyrannosaurus showing a hourglass and oval shaped cross-section respectively.
October 30, 2025 at 4:50 PM
mesozoic.bsky.social
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.
October 30, 2025 at 4:47 PM
mesozoic.bsky.social
A magnified view of the serrations, as well as defined ridges down the crown. Hungarosaurus's close relative, Struthiosaurus, could potentially be found here as well which will likely make distinguishing isolated teeth difficult, if not impossible. They are both struthiosaurin nodosaurids after all.
Close up view of a fossilized leaf-shaped dinosaur tooth of a Hungarosaurus or Struthiosaurus showing ridges running down the crown and large serrations.
October 24, 2025 at 7:47 PM
mesozoic.bsky.social
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.
October 24, 2025 at 7:43 PM
mesozoic.bsky.social
A magnified view of the bone showing what may or may not be bite marks from a predator. Some of the theropods that may have hunted Dzharacursor include the tyrannosaur, Timurlengia, the carnosaur (or carcharodontosaurian) Ulughbegsaurus, and the large dromaeosaurid, Itemirus.
Magnified view of a partial fossilized dinosaur metatarsal of a Dzharacursor showing what may be bite marks from a predator.
October 17, 2025 at 9:44 PM
mesozoic.bsky.social
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.
October 17, 2025 at 9:40 PM
mesozoic.bsky.social
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.
October 10, 2025 at 7:01 PM
mesozoic.bsky.social
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.
October 4, 2025 at 6:35 PM
mesozoic.bsky.social
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.
Magnified view of the serrations or denticles of a fossilized dinosaur tooth of an unknown theropod.
October 3, 2025 at 3:04 PM
mesozoic.bsky.social
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.
October 3, 2025 at 2:59 PM
mesozoic.bsky.social
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.
Close up view of a fossilized dinosaur tooth of an unknown pachycephalosaurid showing serrations and a raised ridge down the center of the crown.
September 26, 2025 at 2:29 PM
mesozoic.bsky.social
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.
September 26, 2025 at 2:25 PM
mesozoic.bsky.social
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.
Magnified view of ridges down the enamel of a fossilized crocodylomorph tooth of a Deinosuchus.
September 19, 2025 at 7:01 PM
mesozoic.bsky.social
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.
September 19, 2025 at 6:56 PM
mesozoic.bsky.social
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.
Magnified view of the serrations or denticles of a fossilized dinosaur tooth of Aquilarhinus or Kritosaurus.
September 12, 2025 at 5:59 PM
mesozoic.bsky.social
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.
September 12, 2025 at 5:56 PM
mesozoic.bsky.social
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).
September 5, 2025 at 4:49 PM
mesozoic.bsky.social
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.
August 29, 2025 at 4:15 PM
mesozoic.bsky.social
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.
August 22, 2025 at 6:51 PM
mesozoic.bsky.social
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.
August 15, 2025 at 6:02 PM
mesozoic.bsky.social
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 showing feeding wear and a large split down the middle of the crown.
August 8, 2025 at 6:21 PM