Natural Features & Ecosystems

Looking across the wetlands of the Niobrara River to the Fossil Hills.

Agate Fossil Beds National Monument is a small park in the northwest corner of Nebraska, with only 2,700 acres of federally managed land included in the 3050 acres within the park boundary. The park takes its name from thin lenses of agate (White River Silicate Group) in the area, which range in color from amber to light gray. Miocene-age rocks are exposed in the park in the bluffs above the Niobrara River wetlands and contain an excellent fossil record. Much of the geologic history is recorded in the natural features found at the park today.

 

Geologic Formations and Water

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  Agate Ash!

  Geologic Formations

  This outcrop is made of Agate ash. It played a large role in how scientists dated the mammal fossils found in this area.

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  Walk over the Niobrara River!

  Rivers and Streams

  The spring fed Niobrara River meanders along a very curved path through Agate all the way to the Missouri River.