A coprolite is fossilized Poo. Coprolites are classified as trace fossils as opposed to body fossils, as they give evidence for the animal's behaviour (in this case, diet) rather than morphology. They serve a valuable purpose in paleontology because they provide direct evidence of the predation and diet of extinct organisms. Coprolites may range in size from a few millimetres to over 60 centimetres.
This particular specimen has been polished on one face and was sourced from America in the state of Utah. Deposited there by an unknown species of Dinosaur.