Tooth - Tyrannosaurus rex
Species: Tyrannosaurus rex
Age: Cretaceous (Maastrichtian), c. 66 million years ago
Location: Hell Creek Formation, Montana, United States
Quite small tooth fragment of a juvenile specimen (classically referred to Nanotyrannus, now no longer recognized as a valid genus), but serrations are preserved. Identifiable down to the genus and species level since Hell Creek did not have any tyrannosaurids other than Tyrannosaurus rex.
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