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.

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.

hiker looking at landscape of valleys and ridges from Cundick Ridge overlook

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.

Cloudy sky and rain falling on Fossil Butte and the sagebrush lowlands.

Current Conditions at Fossil Butte

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

A Fossil Butte volunteer ranger kneels on a rock surface and points something out to a kid.

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.

Well-preserved fossil bird head from Green River Formation

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 visitor center in snow covered landscape

Scenic Photo Gallery

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

Last updated: July 27, 2022

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Contact Info

Mailing Address:

P.O. Box 592
Kemmerer , WY 83101


307 877-4455

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