Mesozoic Market | Fossil Collector & Amateur Paleontology

A dinosaur tooth of an indeterminate carcharodontosaurid from the Grès supérieurs Formation in the Savannakhet Province of Laos. It could possibly belong to cf. Siamraptor suwati, but the size and morphology seems to indicate a more derived species more similar to Carcharodontosaurus. Crown height of this tooth is around 3.2 inches (81mm) with a CBL of 33mm and CBW of 15mm. Midline mesial and distal serration density around 11.5/5mm, with the mesial carinae extending to the base. So a DSDI of 1.0, CHR of 2.45, and a CBR of 0.45.

A dinosaur tooth of a Nanotyrannus sp. from the Hell Creek Formation in Carter County, Montana, United States. Because this nanotyrannid eutyrannosaur consists of two species, N. lancensis and N. lethaeus, these teeth are likely morphologically indistinguishable from one another. While tyrannosaur teeth are very similar to one another, Nanotyrannus teeth are distinguished from Tyrannosaurus rex by the hourglass (or figure eight) shape of the cross-section opposed to being oval or round in tyrannosaurins like T. rex or Tarbosaurus.

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. The Achanarras Quarry is now protected and productive sites are apparently underwater making quality fish increasingly rare on the market. From an old English collection in the early 1980s.

A dinosaur tooth of an indeterminate hadrosaur, possibly Aquilarhinus palimentus from the Aguja Formation in Brewster County, Texas, United States. Aquilarhinus was previous referred to Kritosaurus and Gryposaurus. It is not entirely certain 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.

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.

A group of Permian lungfish tooth plates of a Sagenodus sp. from the Wellington Formation in Waurika, Jefferson County, Oklahoma, USA. These Permian aged lungfish teeth are relatively rare in this deposit.

A mosasaur tooth of a Tylosaurus rex from the Ozan Formation in Fannin County, Texas, United States. This marine lizard, the T. rex, is the largest known tylosaurine mosasaur and one of the largest species of mosasaur. These Tylosaurus were previously referred to Tylosaurus cf. proriger.

A pair of fossilized partial placoderm head shield from a Bothriolepis canadensis from the Escuminac Formation in Escuminac Bay, Quebec, Canada. Bothriolepis was a highly prolific genus of armored fish found across the world. This specimen was purchased from an old collection in the 1970s.

A pair of fragmentary fossilized teeth of a giant beaver or Castoroides dilophidus from Columbia County, Florida, United States. This giant extinct beaver lived alongside Pleistocene aged American beaver or Castor canadensis that are still alive today.

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. Most material found from this famous extinct millipede is in the form of these isolated, but distinct, armor pieces.

A fossilized bird jaw of a Dasornis sp. from Oued Zem, Khouribga, Morocco. Like its relative Pelagornis, pelagornithids like the Eocene aged Dasornis are known as false-toothed or pseudotooth birds for their serrated beaks. There are currently three species of Dasornis present in this deposit, D. abdoun, D. emuinus and D. tolapica.

A dinosaur tooth of an indeterminate tyrannosaurid, either Daspletosaurus sp. or Gorgosaurus libratus from the Judith River Formation in Valley County, Montana, United States. This premaxillary tooth exhibits extensive feeding wear towards the tip. Notably, the serrations on both carinae become less developed towards the base of the tooth. It's unknown if this is taxonomically significant or a product of ontogeny or individual variation, and may or may not indicate a more basal taxa like Gorgosaurus over the more derived Daspletosaurus. In addition, a Teratophoneini indet. and Tyrannosaurini indet. (cf. Tyrannosaurus sp.) may potentially be present in this deposit as well, though unlikely to be the latter due to the undeveloped serrations.

A dinosaur claw of an indeterminate spinosaurid, likely Suchomimus tenerensis from the Elrhaz Formation in Gadoufaoua, Niger. Baryonychine spinosaurids like Suchomimus and Baryonyx are known for their robust hand claws in contrast to the more narrow morphology seen in derived spinosaurines like Spinosaurus.

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.

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 to get a serration count to get the DSDI which is important in distinguishing the Campanian aged tyrannosaurids from North America. The two tyrannosaurid genera described from this deposit are Gorgosaurus and Daspletosaurus. In addition, similar to the Judith River Formation, there appears to also be a Teratophoneini indet. and Tyrannosaurini indet. (cf. Tyrannosaurus sp.) that may be present as well. The tooth has minor crack fill restoration and measures around 1.9 inches.

A dinosaur tooth of an indeterminate saurornitholestine, Saurornitholestes langstoni or Bambiraptor feinbergi from the Judith River Formation in Fergus County, Montana, United States. The hook-shaped serrations on the distal carinae is a distinct characteristic that distinguishes the teeth of saurornitholestine dromaeosaurids or raptor dinosaurs from the larger Dromaeosaurus albertensis and small tyrannosaur individuals. While Bambiraptor is currently only known from the Two Medicine Formation, it is likely present in the similar and geographically close Judith River Formation as well.

A worn dinosaur tooth of an indeterminate tyrannosaurid, possibly a nanotyrannid or teratophonein from the Judith River Formation in Montana, United States. Unfortunately, the provenance for this tooth is absent other than being found somewhere in Northern Montana. The tooth has distinct hourglass-shaped or pinched cross-section which is commonly seen in Nanotyrannus spp. which may indicate that this tooth is simply a misidentified large adult nanotyrannid, possibly the larger species Nanotyrannus lethaeus, from the Hell Creek Formation. However, teeth referred to Labocania aguillonae have been shown to have similar characteristics, so this may potentially belong to a undescribed relative of Teratophoneus. The other tyrannosaurids found in and more commonly associated with this deposit are Gorgosaurus and Daspletosaurus.