Region 20, Appalachian Plateaus and Valley and Ridge

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Abstract
The Appalachian Plateaus and Valley and Ridge Region is part of the Appalachian Sector, which lies in a long, narrow, curving band extending from Newfoundland, Canada, to central Alabama, United States (Heath, Fig. 3, Table 2, this volume). The region is subdivided into three subregions on the basis of hydrogeologic characteristics: the Valley and Ridge, the Appalachian Plateaus, and the Interior Low Plateaus (Fig. 1). Boundaries of the subregions used in this chapter coincide closely with the boundaries of three physiographic provinces of the same name designated by Fenneman (1938), Fenneman and Johnson (1946), and the U.S. Geological Survey (1970), except that herein the northern boundary of the region is the southern limit of significant Pleistocene glaciation.

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