1.31" Tyrannosaur Tooth (T-Rex or Nanotyrannus)

This is a 1.31" long Tyrannosaur tooth from the Hell Creek Formation in Powder River Montana. The tip has been worn down due to rubbing against another tooth in the dinosaur's mouth. Serrations on the inner edge are in great shape. It's a larger, more robust tooth so it could either be a small T-Rex or a large Nanotyrannus.

There is a hot debate among paleontologists about whether Nanotyrannus and Tyrannosaurus rex (T-Rex) are really the same species, with Nanotyrannus representing juveniles. Recent finds that are soon to be published should put this debate to rest, definitively proving that Nanotyrannus is in fact a separate genus and valid genus. Nano teeth tend to be much more finely serrated, and much thinner/blade like t-rex teeth, in addition to being smaller.