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In page Triceratops:

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The first named fossil specimen now attributed to Triceratops is a pair of brow horns attached to a skull roof that were found by George Lyman Cannon near Denver, Colorado, in the spring of 1887.[1] This specimen was sent to Othniel Charles Marsh, who believed that the formation from which it came dated from the Pliocene and that the bones belonged to a particularly large and unusual bison, which he named Bison alticornis.[1][2] He realized that there were horned dinosaurs by the next year, which saw his publication of the genus Ceratops from fragmentary remains,[3] but he still believed B. alticornis to be a Pliocene mammal. It took a third and much more complete skull to fully change his mind.[citation needed]