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This is the lower jaw beak of Triceratops. The original was found in the Hell Creek Formation of late Cretaceous Age or about 66 million years ago.

Individual Triceratops are estimated to have reached about 7.9 to 9.0 meters (26.0–29.5 feet) in length, 2.9 to 3.0 meters (9.5–9.8 feet) in height, and 6.1–12 tons (13,000–26,000 pounds) in weight.

The most distinctive feature is their large skull, among the largest of all land animals. The largest known skull (specimen MWC 7584, formerly BYU 12183) is estimated to have been 2.5 meters (8.2 feet) in length when complete, and could reach almost a third of the length of the entire animal.

It had a single horn on the snout, above the nostrils, and a pair of horns approximately 1 meter (3.3 feet) long, with one above each eye. To the rear of the skull was a relatively short, bony frill, adorned with epoccipitals in some specimens. Most other ceratopsids had large fenestrae in their frills, while those of Triceratops were noticeably solid.