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Dinosaur Discoveries in North America

Early Dinosaur History in the United States

When was the first Triceratops fossil discovered in the United States?

A fossilized skull of a three-horned, Cretaceous period, herbivorous dinosaur was discovered by John Bell Hatcher (1861–1904) and Othniel Charles Marsh (1831–1899) in 1888 in the Judith River beds of Montana. This dinosaur would subsequently be named Triceratops.

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