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 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.
After the Age of Dinosaurs came the Age of Mammals. Agate Fossil Beds features unique animals from the Miocene age.Read More
The James H. Cook Collection
A friendship between James Cook and Red Cloud of the Oglala Lakota Sioux grew during the late 1800's. From this friendship came the Cook Collection.Read More
Two trails totaling almost five miles are available for the hiking crowd. Walk to the early excavation sites or view an unusual trace fossil.Read More
Agate Fossil Beds Facebook
Join us on Facebook for current day-to-day happenings.Read More
The Fossil Freeway
Come travel the "Fossil Freeway" and get acquainted with the deep history of North America's High Plains!Read More
A Sea of Mixed Grass Prairie
Agate Fossil Beds National Monument is composed of almost 3000 acres of mixed grass prairie. Over 300 species of native plants are found here.Read More
Ranching in Sioux County
Agate Fossil Beds National Monument is in the middle of ranch country. Driving to the monument gives one a sense of living with the land.Read More
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...