Park phone lines intermittently out of service
If you cannot reach the park by phone, please click the Contact Us link on the left side of this page to email a ranger. Staff will call or email back during business hours.
Fossils and Much, Much More
During the 1890s, scientists rediscovered what the Lakota Sioux already knew - bones preserved in one of the most complete Miocene Epoch mammal sites in the world.
Yet, this place called "Agate" is a landscape that reflects many players – 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.
Did You Know?
A very small camel, the Stenomylus camel, was found near the Agate Fossil Hills. This camel was about two feet tall at maturity. Although the quarry is not accessible, displays about this fragile-looking animal are available in the visitor center. More...