Fossil Butte National Monument

Fossil Butte National Monument is a United States National Monument in Southwest Wyoming.


Fossil Butte National Monument is a unique paleontological site, where ecosystems of the 50-million-year-old Green River Formation of the ancient subtropical lake bed were unusually well preserved. The fossils include fish, alligators, bats, turtles, dog-sized horses, insects, and many other species of plants and animals.

Get in

The visitor center can be reached along U.S. Highway 30 about 15 miles west of Kemmerer.


There is no fee to enter the monument. Donations are welcome.



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