A full-sized skeleton diorama of the Agate waterhole 20 million years ago shows three startled chalicothere skeletons (Moropus elatus, related to the horse and rhino), standing 6 feet tall at the shoulder and having 3-toed, claw-like hooves. Agate Fossil Beds National Monument boasts some of the most well-preserved Miocene fossils in the world. The park is near Harrison, Nebraska, USA. Agate’s grass-covered plains and flat-top buttes represent 20 million years of natural history. This valley of the Niobrara River contains important fossils found on Carnegie Hill and University Hill.
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