- Allegheny Plateau
The Allegheny Plateau is a large
dissected plateauarea in western and central New York, northern and western Pennsylvania, northern West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateauand the glaciated Allegheny Plateau.
The plateau extends southward into western
West Virginia, eastern Kentuckyand Tennesseewhere it is instead called the Cumberland Plateau.
The plateau terminates in the east at the
Allegheny Mountains, which are the highest ridges just west of the Allegheny Front. The front extends from central Pennsylvania into eastern West Virginia.
The plateau is bordered on the west by glacial till plains in the north, generally north of the
Ohio River, and the Bluegrass regionin the south, generally south of the Ohio River.Elevations vary greatly. In the glaciated Allegheny Plateau, relief may only reach one hundred feet or less. In the unglaciated Allegheny Plateau in southeastern Ohio and westernmost West Virginia, relief is typically in the range of two hundred to four hundred feet. Absolute highest elevations in this area are often in the range of convert|900|to|1500|ft|m. By the Allegheny Front, however, elevations may reach well over convert|4000|ft, with relief of up to convert|2000|ft.
One of the more notable geologic areas within the Allegheny Plateau is the
Hocking Hills regionof southeast Ohio.
Geology and physiography
The Allegheny Plateau is a physiographic section of the larger
Appalachian Plateauprovince, which in turn is part of the larger Appalachian physiographic division.cite web |title=Physiographic divisions of the conterminous U. S. |publisher=U.S. Geological Survey |url=http://water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml |accessdate=2007-12-06 ]
* [http://www.theallegheny.com Photographs of the Allegheny Plateau and the Allegheny River watershed region]
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