T-Rex/Nanotyrannus Tooth

Age: 66 - 65.5 Million Year Old, Late Cretaceous 

Species: T-Rex/Nanotrannus

Discovered: Newell, South Dakota, Hell Creek Formation

Notes: Palentologically speaking, Nanotyrannus does not exist and is considered to be a Juvenile Tyrannosaurus Rex. No Complete specimen of either has been recovered. There are slight differences between the teeth, which is the source of debate. Until a complete specimen of either is discovered, it will remain T-Rex/nanotyrannus.