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In 1887, a skull roof with two horns belonging to Triceratops was found in Denver, Colorado. Paleontologist Othniel Charles Marsh originally misidentified as a prehistoric bison. In 1888, John Bell Hatcher found a much more complete skull of Triceratops in Wyoming, and then Marsh realized his mistake. Both of these specimens were assigned to the new genus Triceratops.

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12y ago

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