3.6" Fossil Hadrosaur (Edmontosaurus) Ungual - Montana

This is an ungual (claw bone) from an adult Hadrosaur (Edmontosaurus annectens) that was collected from the Hell Creek Formation on a private lease in Dawson County, Montana. It was found in multiple pieces, requiring some crack repair with gap fill restoration. There is also some restoration along one edge of the bone and restoration across the ventral side. The bone measures 3.6" long by 2.8" wide and comes with an acrylic display stand.

Edmontosaurus had four digits with the second and third ending in unguals. An ungual is a highly modified distal toe bone which ends in a hoof, claw, or nail. Elephants have ungual phalanges, as did the sauropods and horned dinosaurs.

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
Dawson County, Montana
Hell Creek Formation
3.6" long, 3.3" wide
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