• 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?

undescribed bat

The oldest known bat fossils are from the Fossil Lake deposits of the Green River Formation in southwestern Wyoming.