Kritosaurus Caudal (Tail) Vertabra - Two Medicine Formation

This is a caudal vertabra of Kritosaurus breviceps a hadrosaurid or duck-billed dinosaur dinosaur. It's 1.3 inches long and comes from the Two Medicine Formation (Judith River Group) of Montana which is older than the Hell Creek Formation. There is a repaired crack in the bone but no restoration.

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.

More about Hadrosaurs