.57" Tyrannosaur Premax Tooth - Judith River Formation, Montana

This is a .57" Tyrannosaur premaxillary tooth from the Judith River Formation 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.

There is feeding damage to the tip. Comes with an acrylic display case.

These oddly shaped teeth with two ridges located on the lingual side where originally described as Aublysodon more than a century ago based off of isolated teeth and jaw fragments. More recent discoveries of more complete Tyrannosaur skeletons from this formation has lead to the discovery that these teeth are actually the premaxillary teeth from juveniles of other Tyrannosaur species.

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.

Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification

Albertosaurus, Gorgosaurus or Daspletosaurus
North Central Montana
Judith River Formation
.57" long
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