3.5" Fully Rooted Tyrannosaur Tooth - Montana

This is a rare, fully rooted, 3.5" Tyrannosaur tooth from the Two Medicine Formation (Judith River Group) of Montana. This formation is approximately 70 million years old, or about 5 million years old than the Hell Creek Formation which produces T-Rex.

Teeth with their roots still intact are rare finds. In fact from this location less than 1% of the teeth found have their roots intact. The vast majority of teeth were lost/shed while the dinosaur was still alive while rooted teeth indicate they came out of the skull of a dead animal. Even when this happens it's rare for the roots to stay together as they are much more fragile than the crowns of the teeth.

The tooth is a pretty weathered with most of it's enamel missing though many of the serrations are intact and the tip is in good shape. The tooth has been stabalized but no restoration has been done to it.

There are three described Tyrannosaurs from the Two Medicine Formation (Judith River Group), Albertosaurus, Gorgosaurus and Daspletosaurus. Research done on teeth from these three Tyrannosaurs has concluded that isolated teeth are statistically impossible to assign to a specific genre because they are so similar.
I've linked to the research paper below.

Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification
Albertosaurus, Gorgosaurus or Daspletosaurus
North Central Montana
Two Medicine Formation, Judith River Group
3.5" long, Crown 1.45"
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