National Park Service, Nebraska.
During the 1890s, scientists rediscovered what the Lakota Sioux already knew—bones preserved in one of the world's most significant Miocene Epoch mammal sites. Yet, this place called "Agate" is a landscape that reflects many influences—from early animals roaming the valleys and hills, to tribal nations calling the High Plains home, to explorers passing through or settling in the American West.
If traveling east or west on U.S. Highway 20 go 22 miles south of Harrison, NE on State Hwy 29 then 3 miles east on River Road (paved) If traveling east or west on U.S. Highway 26 go 34 miles north of Mitchell, NE on State Hwy 29 then 3 miles east on River Road (paved). Also accessible from State Hwy 71, 25 miles on unpaved River Road.