1.7" Cretaceous Crocodilian Jaw Section - Judith River Formation

Cretaceous Crocodilian Jaw Section - Judith River Formation #227817

This is a 1.7" wide crocodilian jaw section from the Judith River Formation of Montana. This formation is approximately 74 million years old, or about 9 million years older than the Hell Creek Formation which produces T-Rex. The teeth sockets are still beautifully preserved within the jaw.

Comes with an acrylic display case.

There are a number of genres of crocodiles and alligatoroids described from this formation with very similar teeth and jaws. Typically most crocodilian material just get assigned to Leidyosuchus by collectors, however in 1997 several species of Leidyosuchus were reassigned to Borealosuchus.

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 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 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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