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North America > United States of America > Rocky Mountains (United States of America) > Wyoming > Southwest Wyoming > Fossil Butte National Monument
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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.

Get around


  • Visitor Center. May-September: daily 09 am-5:30 pm; Oct-Nov 29: daily 08 am-4:30 pm; Nov 30-Mar 7: Tu-Sa 08 am-4:30 pm, closed holidays; Mar 8-Apr: daily 08 am-4:30 pm. There are over 300 fossils on display, two video programs and fossil preparation demonstrations.


  • Fossil research quary. If you hike to Fossil research quary in summer Friday or Saturday between 11 am and 4 pm, you'll have a chance to witness fossil excavation.
  • Hike the 2.5 mile Historic Quarry Trail or the 1.5-mile Nature Trail
  • Become a Junior or Senior Ranger
  • Have a snack in the picnic Area





Stay safe

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