The Painted Desert is a United States desert of badlands in the Four Corners area from the Grand Canyon National Park into the Petrified Forest National Park. Much of the area within the Petrified Forest National Park is protected as the Petrified Forest National Wilderness Area. Much of the Painted Desert region is within the Navajo Nation. The desert is composed of stratified layers of easily erodible siltstone, mudstone, and shale of the Triassic Chinle Formation. These fine grained rock layers contain abundant iron and manganese compounds which provide the pigments for the various colors of the region.
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