8.4" Juvenile Dinosaur (Thescelosaurus) Humerus Bone - Montana

Juvenile Dinosaur (Thescelosaurus) Humerus Bone - Montana #183998

This is an 8.4" long, juvenile Thescelosaurus humerus (upper arm) bone from the Hell Creek Formation in Dawson County, Montana. There is significant gap fill restoration through the diaphysis of the bone, where it was found fragmented within the surrounding rock. Both the proximal and distal epiphysis are weathered, but required no repair or restoration.

This bone measures 8.4" long, with a 2.3" wide proximal end and 1.6" wide distal end. Comes with a riker mount case for display.

Thescelosaurus was a small ornithopod dinosaur that appeared at the very end of the Late Cretaceous period in North America. Many specimens' preservation and completeness indicate that Thescelosaurus may have preferred to live near streams.

This bipedal ornithopod is known from several partial skeletons and skulls, all of which indicate adult lengths between 2.5 and 4.0 meters (8.2 to 13.1 feet) on average. It had sturdy hind limbs, small wide hands, and a head with an elongated pointed snout. Their teeth and jaw morphologies suggest a primarily herbivorous diet.

An artist's reconstruction of Thescelosaurus. Creative Commons License

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.