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it acquired its present designation: AMNH 5730.Several years after Cope's description, his arch-rival, Othniel Charles Marsh, published a paper on a sizable lower jaw recovered by John Bell Hatcher in 1889 from the Lance Formation rocks in Niobrara County, Wyoming. Marsh named this partial jaw Trachodon longiceps, and it is cataloged as YPM 616.

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