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is a large, dissected plateau region in the eastern United States. It extends from New York southwest to Alabama. It runs parallel to Lake Erie on the northwest, but does not include the land adjacent to the Great Lakes. The plateau is composed of sedimentary rocks, including sandstones, conglomerates, and shales, that were deposited during the late Paleozoic Era. These rocks are generally flat-lying, but have been dissected by streams to form a rugged and mountainous terrain. In addition to these sedimentary

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