This is a really spectacular Gryposaurus maxilla (upper jaw) collected this past summer from the Judith River Formation in Montana. It would have been from the right side of the skull on a sub-adult animal. The entire piece is 7.7" long and has a battery of nicely preserved teeth still in place. The display side of the jaw is in excellent condition and well prepped while the back side of the jaw was exposed on the surface and has some weathering. It comes with a custom metal display stand.
Gryposaurus (meaning "hooked-nosed lizard") was a genus of duckbilled dinosaur that lived about 83 to 74 million years ago. It is most easily distinguished from other Hadrosaurs by its narrow arching nasal hump, sometimes described as similar to a "Roman nose" Gryposaurus was a hadrosaurid of typical size and shape, reaching lengths of around 25-30 feet long.
A skull of Gryposaurus at the American Natural History Museum. Photo by Steve Lew
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 contained the remains of the theropod Hesperornis, the only known freshwater Hespernorthid, a penguin like bird.