mesozoicmarket - Tumblr blog

[mesozoicmarket]

A dinosaur tooth of an indeterminate theropod, possibly a megalosauroid from the Lourinhã Formation in Lourinhã, Portugal. Many theropods from the Jurassic had similar teeth making identifications of incomplete crowns difficult. The tooth is comparable to a morphology attributed to megalosauroids from this deposit depending on how the missing section is reconstructed.

[mesozoicmarket]

An ammonite fossil of a Gaudryceras sp. from the Yezo Group in the Yūbari River in Yūbari, Hokkaidō, Japan. This genus of Cretaceous cephalopod can be found widely distributed around the world.

[mesozoicmarket]

A worn ziphosuchian crocodylomorph tooth of a Razanandrongobe sakalavae from the Isalo III Formation in Ambondromamy, Madagascar. The diagnostic serrations of this genus have mostly been worn away to feeding, though some faint denticles remain. With massive teeth as large as Tyrannosaurus, this Middle Jurassic terrestrial crocodylomorph was one of the top predators in its environment.

[mesozoicmarket]

A dinosaur tooth of an Archaeodontosaurus descouensi from the Isalo III Formation in Ambondromamy, Madagascar. This early diverging Middle Jurassic sauropod had leaf-shaped teeth with large denticles similar to basal sauropodomorphs or "prosauropods".

[mesozoicmarket]

A dinosaur vertebra, likely Camptosaurus dispar from the Morrison Formation in the Bighorn Basin in Wyoming, United States. The lesser known and contemporary ornithopod, Uteodon aphanoecetes may or may not be species of this genus. These basal iguanodontians lived alongside smaller ornithischians such as Dryosaurus sp. and Nanosaurus agilis.

[mesozoicmarket]

A fossilized crocodilian tooth of a Pleistocene aged American alligator, or Alligator mississippiensis from Sarasota County, Florida, USA. Fossils of alligators are abundant in Florida where they are still alive today.

[mesozoicmarket]

A dinosaur tooth of an iguanodont, likely an Ouranosaurus nigeriensis or Lurdusaurus arenatus from the Elrhaz Formation in Gadoufaoua, Niger. Unfortunately, iguanodont teeth are difficult to distinguish between species, if not impossible.

[mesozoicmarket]

A dinosaur tooth of an indeterminate theropod from the Elrhaz Formation in Gadoufaoua, Niger. The tooth could potentially belong to a noasaurid, possibly Afromimus tenerensis, but it is impossible to say with any certainty. The short mesial carinae would exclude the abelisaurid Kryptops palaios.

[mesozoicmarket]

A fossilized tooth of a Prodeinotherium bavaricum or Deinotherium sp. from Gornji Vakuf-Uskoplje, Bosnia and Herzegovina. These basal elephant-like proboscideans or deinotheres are known for their downward facing tusks.

[mesozoicmarket]

A fossilized shark tooth of a Scapanorhynchus texanus from the Eagle Ford Group in Dallas/Fort Worth Airport in Dallas County, Texas, United States. This genus of Cretaceous aged goblin shark or mitsukurinid is similar to its modern day relative, Mitsukurina owstoni.

[mesozoicmarket]

A fossilized rooted crocodilian tooth of an Alligator prenasalis from the Brule Formation in Custer County, South Dakota, United States. This Paleogene aged species of alligatorine is currently the oldest occurrence of the genus Alligator.

[mesozoicmarket]

A fossilized tooth of a sperm whale, possibly Aulophyseter morricei from the Temblor Formation in Sharktooth Hill near Bakersfield, Kern County, California, United States. These extinct Miocene aged sperm whales lived alongside the famous shark, Otodus megalodon.

[mesozoicmarket]

A fossilized vertebra of a Majungasaurus crenatissimus from the Maevarano Formation in the former Mahajanga Province of Madagascar. This dinosaur is most famous for showing direct evidence of cannibalism. The specimen does have some weathering and cracks here and there, but no restoration or repair as far as I can tell. Fossils of this relatively famous abelisaurid are still sometimes labeled as Majungatholus atopus which can cause confusion, but both species names refer to the same animal with Majungatholus being a synonym.

[mesozoicmarket]

A fossilized shark tooth of a great white shark, or Carcharodon carcharias from the Tirabuzon Formation in Corkscrew Hill, Santa Rosalia, Baja California, Mexico. The great white shark is undoubtedly the most famous species of shark and its teeth can be found from the Miocene. This particular specimen comes from the Pliocene.

[mesozoicmarket]

A dinosaur tooth of an indeterminate tyrannosaurid, either Daspletosaurus sp. or Gorgosaurus libratus from the Judith River Formation in Hill County, Montana, United States. Unfortunately, the vast majority of teeth of Gorgosaurus and Daspletosaurus are indistinguishable from one another. There are currently two species of Daspletosaurus described from this deposit, Daspletosaurus torosus and Daspletosaurus wilsoni. The tooth has an interesting red coloration and pronounced enamel texture. The midline distal serration density is 13/5mm, while the midline mesial serration density appears to be the same, though very worn down, and around 15/5mm towards the base.

[mesozoicmarket]

A phytosaur tooth, possibly Machaeroprosopus sp. from the Chinle Formation in Apache County, Arizona, USA. These early crocodile-like archosaurs were one of the largest predators of the Triassic, dwarfing many early dinosaurs and kin.

[mesozoicmarket]

A dinosaur tooth, likely a Chenanisaurus barbaricus from the Couche III in the phosphate mines of Sidi Chennane, Oued Zem, Khouribga, Morocco. A recent study suggests that multiple species or genera of abelisaurids may have lived in this Maastrichtian deposit, though they are described as being smaller than Chenanisaurus. The tooth has a midline serration density of 10/5mm on both carinae typical of this species.