This wallpaper shows Badlands National Park in South Dakota, which contains the world’s richest Oligocene epoch fossil beds—dating 37-28 million years old. Ancient mammals such as the rhino, horse, and saber-toothed cat once roamed here. The park’s 244,000 acres protect an expanse of mixed-grass prairie where bison, bighorn sheep, prairie dogs, and black-footed ferrets live today.
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