America's Aquarium in Stone

Some of the world's best preserved fossils are found in the flat-topped ridges of southwestern Wyoming's cold sagebrush desert. Fossilized fishes, insects, plants, reptiles, birds, and mammals are exceptional for their abundance, variety, and detail of preservation. Most remarkable is the story they tell of ancient life in the warm, wet environment in and around a freshwater lake. Read More

Diplomystus dentatus, a football shaped Eocene herring fish fossil facing left.

Fossil Exhibits

A variety of fossil fishes, insects, plants, reptiles, birds and mammals from Eocene Fossil Lake are displayed in the visitor center museum.

A trail leading down amid sagebrush, aspen to the left, green hills out into the distance.

Hiking Trails

Experience the geology, wildlife, scenery, and wide open spaces of Fossil Butte by hiking the trails, dirt roads or taking the scenic drive.

Sagebrush sloping up to a ridge overlooking a valley covered with snow and blue sky and clouds above

Current Conditions at Fossil Butte

As you plan your visit, be sure to check out the current conditions at Fossil Butte National Monument.

A ranger standing in front of Fossil Butte holding a fossil fish and pointing at it

Ranger-Led Programs

We offer a variety of ranger programs during in the summer months including fossil preparation demonstrations and drop in programs.

student measuring leaf for leafy thermometers and rain gauges activity for Fossil Butte

Curriculum Materials for Teachers

Teachers, have fun with these hands-on curriculum materials about Fossil Butte fossils designed for your classroom.

Fossil bat with right wing outstretched. Left wing is down and cut off by edge of rock.

Fossil Photo Gallery

Fossils are windows into the past. Check out photos of the incredibly well preserved fossils from the Green River Formation.

Fossil Butte with the top in sunshine and the bottom in shade. A cloud-spotted blue sky is above.

Scenic Photo Gallery

Photos of Fossil Butte's sagebrush step show the land's unique beauty throughout the year.

Last updated: March 17, 2023

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Contact Info

Mailing Address:

P.O. Box 592
Kemmerer, WY 83101


307 877-4455

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