Species: Brachychampsa sp.

Formation: Hell Creek Formation

Location: Wibaux County, Montana 

Age: Cretaceous, 68-65 mya


This is an authentic crocodilian tooth fossil from the Hell Creek Formation of Wibaux County, Montana. The exact species is unknown, as there are many species of crocodilians known from the Hell Creek Formation, and it can be difficult or flat out impossible to distinguish them based on isolated teeth. This tooth, however, is from the Brachychampsa genus.


Crocodilians are a highly diverse and successful group of carnivorous reptiles which first appeared about 250 million years ago, and still exists today. Though Antarctica and Europe lack native extant species, crocodilian fossils have been found on every continent. They are characterized by armored lizard-like bodies, laterally compressed tails, and wide, flat snouts, among other features. Though all of the surviving species of crocodilian are adapted for semi-aquatic lifestyles, many extinct species were actually fully terrestrial.


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