2.53" Serrated Tyrannosaur Tooth With Hadrosaur Tooth

This is a beautiful, 2.53" long, serrated Tyrannosaur tooth collected this summer from the Judith River Formation of Montana. It was found naturally associated with a piece of bone and what appears to be a hadrosaur "spitter" tooth. They have been left attached to the tooth, creating this unique association specimen. This formation is approximately 74 million years old, or about 9 million years older than the Hell Creek Formation which produces T-Rex.

There are multiple repaired cracks through the tooth, each of which required some minor gap fill restoration.

There are three described Tyrannosaurs from the Two Medicine & Judith River Formations; 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 genus because they are so similar.

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

The Judith River Formation is one of the most prolific sources of Late Cretaceous vertebrate fossils. At least sixteen Orders containing more than forty Genera are known from the formation. These include fish, amphibians, mammals, and insects in addition to the reptiles, avian and non-avian dinosaurs (birds). Among the more interesting specimens is Leonardo, a mummified and fossilized Brachylophosaurus. This is a Hadrosaur, a duck-billed dinosaur with amazing preservation of the soft tissues of the body. The pattern in the skin of the feet is even preserved. In addition to Leonardo, the Judith River Formation contains the remains of the theropod Hesperornis, the only known freshwater Hespernorthid, a penguin like bird.

Albertosaurus, Gorgosaurus or Daspletosaurus
Hill County, Montana
Judith River Formation
2.53" long (straight-line)
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