20.15" Fossil Hadrosaur (Edmontosaurus) Right Humerus - South Dakota

Fossil Hadrosaur (Edmontosaurus) Right Humerus - South Dakota #192629

This is a 20.15" long Hadrosaur (Edmontosaurus) right humerus bone, collected from the Hell Creek Formation in South Dakota.

Starting with the proximal end, the articular head of the humerus has undergone some restoration in spots, however the majority of it is natural. The deltopectoral crest was found separated from the rest of the bone, requiring some gap fill restoration in spots where the bone had crumbled away. Crack repair and spots of gap fill restoration continue throughout the diaphysis as you approach the distal epiphysis. The majority of the restoration can be found at the distal end, where both the radial and ulnar condyles have almost entirely been restored.

Hadrosaurs

are frequently referred to as duck-billed dinosaurs and are members of the Ornithischian family Hadrosauridae. They were fairly common herbivores that roamed Asia, Europe, and North America during the Upper Cretaceous Period. Many species of Hadrosaurs had distinctive crests on their heads, some of which had air-filled chambers that may have produced a distinct sound. These crests may have been used for both audio and visual display purposes.

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.

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