Southwestern Wyoming contains one of the most unique fossil sites in the world—Fossil Butte National Monument. Located about 11 miles west of Kemmerer, it was established as a national monument on October 23, 1972.1 The park encompasses about 13 square miles and contains several buttes, or flat-topped hills.
These landforms expose a rock layer known as the Green River Formation (GRF) and its diverse fossil assemblage, often called a Lagerstätte.2 The GRF is best known for its fish fossils, but it includes many other fossil types as well. Most of these fossils are found in the Fossil Butte Member, a section of the formation that measures about 200 to 260 feet thick.3
Read More: Fossil Butte National Monument: Spectacular Flood Graveyard | The Institute for Creation Research
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