Natural Features & Ecosystems

Fossil Lake was approximately 50 miles long and 20 miles wide.  The light colored ridges, visible from Cundick Ridge, are what's left of the Fossil Lake deposits.
View from Cundick Ridge.

NPS photo

Fossil Butte National Monument offers a window into life in southwestern Wyoming 50-million years ago during the Eocene Epoch. Today's high-desert environment of the national monument is a stark contrast to the sub-tropical lake environment of the past.

At Fossil Butte National Monument and 15 other national park units, the Northern Colorado Plateau Network conducts long-term inventory, monitoring, analysis, and reporting on key park resources to assess the condition of park ecosystems and develop a stronger scientific basis for stewardship and management of natural resources. In cooperation with park staff, the network monitors climate, invasive exotic plants, land surface phenology, landbirds, and landscape dynamics at the monument.

Last updated: February 24, 2015

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Mailing Address:

P.O. Box 592
Kemmerer, WY 83101


(307) 877-4455

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