See Fossil Butte, Fossil Butte National Monument, Wyoming

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The landform, Fossil Butte, is an erosional remnant (essentially a large hill being slowly eroded into the valleys below) exposing the Fossil Butte Member prominently on its south and west sides, with subtle exposures to the east and north. In addition to the fish fossils, erosion of the butte has revealed reptile fossils such as crocodiles, turtles, snakes, and even lizards. Mammal fossils found in the area include bats, a horse, and other extinct herbivores. Bird fossils have also been discovered, including feathers and a large frigate bird, as well as a wide array of plant and insect fossils, such as palm fronds, cattails, several species of leaves, seeds, seed pods, and even flies and mosquitoes.

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