Ключевые слова: ancient, antelope county, archaeologist, archaeology, archeology, ash, ashfall, ashfall fossil beds, background, bone, bones, dig, display, eruption, evolution, excavation, fields, fossil, geology, historic, history, lagersatten, museum, nature, nebraska, outdoor, paleontology, park, preserved, rhino, rock, science, skeleton, skull, specimen, state, university, usa, visitors, volcanic ash,