Geologic activity over the last 250 million years has removed or covered up many of the Permian deposits around North America. While Permian rocks may be found below the surface in some states, exposures can be found in the Cascade Mountains, Sierra Nevada, Great Basin, around the Grand Canyon, from Texas to Kansas, and Ohio. Permian rocks are also present in the Yukon, Prince Edward Island, and several other Canadian provinces, as well as in exposures in both northeastern and southern-most Mexico.
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