• Knightia eocaena mass mortality

    Fossil Butte

    National Monument Wyoming

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 a sub-tropical landscape.

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Did You Know?

Fossil Butte from a distance

Fossil Butte National Monument preserves only 1% of the Fossil Lake deposits, the smallest of three ancient lakes that make up the famous Green River Formation.