This Specimen has been sold.
2.6" Hadrosaur (Duck-Billed Dinosaur) Jaw Section - Montana
This is a 2.6" tall jaw section of an unidentified Hadrosaur dinosaur from the Two Medicine Formation of Montana. There are four tooth sockets visible. Several Hadrosaurs are known from this formation so it can't be labeled down to a specific genus/species.
Hadrosaursare 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 hardrosaurs had distinct crests on their head, some of which had air filed chambers that may have produced a distinct sound. These crests may have been used for both audio and visual display purposes.