Collected from the famous Hell Creek Formation of Northwestern U.S.A., this is a MASSIVE Triceratops third metatarsal bone (MT III). It was found complete and unbroken but with the top exposed to the elements, and required numerous cracks to be filled and stabilized. It is the primary, central metatarsal and based on the size of this whopper specimen, this bone would have come from a MAXIMUM-SIZE Triceratops dinosaur.
Triceratops is the most famous of the great horned dinosaurs. This plant-eating group has been found in the fossil record in greater abundance than all the other varieties. A full grown Triceratops is estimated to have weighed 11 tons, heavier than a modern African bull elephant. Its skull was 6.5 feet long with a pair of brow horns that exceeded 3 feet in length.