Fossils and Much, Much More

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.

The Agate Fossil Beds with fluffy clouds.

Discover the Agate Fossil Hills

The Agate Fossil Hills has been a destination for paleontologists, explorers and National Park visitors.

The Dinohyus is featured in the visitor center diorama.

Visitor Center Diorama

Reconstructed skeletons of Miocene age mammals aid in understanding the early 1900s excavations.

These beaded moccasins were signed by gift giver Red Cloud.

The James H. Cook Collection

These beaded moccasins and many other items were given to James Cook and his family by members of the Oglala Lakota and others.

Black and white photo of a gathering of American Indians and Cook at the Agate Springs ranch house.

The Agate Springs Ranch

Both paleontologists and American Indians such as Red Cloud of the Oglala Lakota, American Horse and others visited James Cook here.

Last updated: August 28, 2017

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301 River Road
Harrison, NE 69346


(308) 668-2211

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