20.5" Fossil Hadrosaur (Duck-Billed Dinosaur) Rib - Montana

This is a 20.5" long rib of a Hadrosaur (Edmontosaurus annectens?) more commonly referred to as a "duck-billed dinosaur". The bone was collected from the Hell Creek Formation in Carter County, Montana. There are several (7+) repaired cracks through this rib bone, some of which required some gap fill restoration in spots where the bone crumbled away. The distal end of the rib has undergone significant repair and restoration where the bone was found fragmented. Overall, this rib bone is in fantastic condition.

Hadrosaurs are frequently referred to as duck-billed dinosaurs and are members of the Ornithischian family Hadrosauridae. They were fairly common herbivores which 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.
Edmontosaurus annectens?
Carter County County, Montana
Hell Creek Formation
20.5" long (straightline)
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