Rare Ankylosaur Scute (Armored Plate) - Montana

This is a good sized scute (armored plate) from a 70 million year old Ankylosaur. It comes from the Two Medicine Formation (Judith River Group) of Montana and is approximately 3 1/4 by 2 1/4 inches in size.

Ankylosaurs were herbivorous dinosaurs that lived during the Cretaceous and evolved complete body armor covered in plates, scutes and spikes. They wielded a massive tail club which could have been used to defensive purposes against predators such as Tyrannosaurids. Adult Ankylosaurs are believed to have reached up to 25 feet in length.