14.6" Fossil Hadrosaur (Edmontosaurus) Mandible - South Dakota

This is a 14.6" wide mandible/dentary (lower jaw) section of Edmontosaurus annectens, a type of Hadrosaur from the Hell Creek Formation of Harding County, South Dakota. It is the proximal half of the right side of the mandible. The preservation of the bone resulted in a wonderful red-brown color and the quality of preservation is excellent across most of the specimen. It features the cavities that the battery of teeth would have sat within, though there are no teeth present.

Comes with an acrylic-metal display stand.

The jaw was found fragmented along the proximal-inferior edge, requiring crack repair and gap fill restoration for stability. Crack repairs can be found throughout the battery cavities as well.

Edmontosaurus is one of the largest Hadrosaurs, and one of the most widespread: fossil remainshave been found across western North America, from Colorado to northern Alaska. This large herbivore was about the same size as the contemporary predator Tyrannosaurus, reaching 39 feet in length and an average weight of about 6 tons. Named after Edmonton, the capital of the Canadian province of Alberta where its first fossils were discovered, Edmontosaurus was a gregarious terrestrial herbivore that ground up low-lying plant material with its large battery of ever-restoring teeth. Numerous skin impressions and mummified specimens show us that Edmontosaurus had scaly skin, and its forelimbs were enclosed in a fleshy "mitten" serving a purpose similar to a hoof. Edmontosaurus was a member of the Saurolophine clade of Hadrosaurs, meaning they had little to nonexistent crests on the backs of their skulls.

Because of its age and sedimentary composition, the Hell Creek Formation has become one of the most paleontologically studied areas in the world. 158 genera of animals and 64 genera of plants are known from the formation and new discoveries are made frequently. In addition to Tyrannosaurs, Ceratopsids, and Hadrosaurs, the formation has yielded remains of amphibians, reptiles, lizards, snakes and turtles, fish and sharks, avian and non-avian dinosaurs, and mammals. The Hell Creek Formation gives the most complete understanding of the environment just before the Cretaceous-Paleogene extinction.
Edmontosaurus annectens
Harding County, South Dakota
Hell Creek Formation
14.6 x 8.6"
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