Fossil Butte National Monument is a unit of the National Park Service located 15 miles west of Kemmerer, Wyoming, USA. It centers on an extraordinary assemblage of Eocene Epoch (56 to 34 million years ago) animal and plant fossils associated with the smallest lake — Fossil Lake — of the three great lakes which were present at that time in what are now Wyoming, Utah, and Colorado. The other two were lakes were Lake Gosiute and Lake Uinta. Fossil Butte National Monument was established as a national monument on October 23, 1972.
Fossil Butte National Monument preserves the best paleontological record of Tertiary aquatic communities in North America and possibly the world, within the 50-million-year-old Green River Formation — the ancient lake bed. Fossils preserved — including fish, alligators, bats, turtles, dog-sized horses, insects, and many other species of plants and animals — suggest that the region was a low, subtropical, freshwater basin when the sediments accumulated, over about a 2 million-year period.
Read more about Fossil Butte National Monument: History, Exhibits, Activities, List of Fossil Species Recovered At Fossil Butte National Monument, Gallery
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