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Vertebrate Paleontology Hall, NHB, by Unknown, c. 1930, Smithsonian Archives - History Div, 33835-B or MNH-33835B or 2005-2542.

May 7, 1889

John B. Hatcher, an assistant to the famous paleontologist, O. C. Marsh, professor at Yale University and Vertebrate Paleontologist for the U.S. Geological Survey, visits a fossil site at the bottom of deep canyon on a ranch in Converse (now Niobrara) County in Wyoming to see the remains of a creature that Marsh would name Triceratops. Over the next several years, Hatcher excavated the fossils which became part of the collections of the U.S. National Museum.More

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