Juvenile Tyrannosaur Tooth and Raptor Tooth in Rock - Judith River Fm.

This is a beautiful, .58" long serrated juvenile tyrannosaur tooth preserved alongside a .30" long small theropod (raptor) tooth, collected from the Judith River Formation of Montana. This formation is approximately 75 million years old, or about 9 million years older than the Hell Creek Formation which produces Tyrannosaurus rex.

The teeth have been exposed from the rock they were found in, with a significant amount of rock left in place for in situ presentation. Both teeth are repair free and have preserved serrations, though the serrations on the raptor tooth are small and best seen under magnification. Based on the carinae locations on the tyrannosaur tooth, it would have been positioned near the anterior end of the skull.

Comes with an acrylic display stand.

Three species of tyrannosaur have been described 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 world's 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 reptiles and avian (birds) and non-avian dinosaurs. Among the more interesting specimens is Leonardo, a mummified and fossilized Brachylophosaurus. This is a hadrosaur, a duck-billed dinosaur found with amazing soft-tissue preservation: skin impressions can be found on 90 percent of its body! The pattern in the skin on its 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.

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