Allegheny Plateau, dissected plateau, western part of the Appalachian Mts., extending c.500 mi (800 km) SW from N Pa. to SW Va., rising to c.4,860 ft (1,480 m) at Spruce Knob, the highest peak in West Virginia. The E Allegheny Plateau, known as the Allegheny Mountains or the Alleghenies, has a steep eastward-facing escarpment often called the Allegheny Front (c.1,500-1,600 ft/460-490 m high) and is more rugged than the western portion. The plateau, formed by the folding of sedimentary rocks, has been subsequently reduced by erosion. The mountains, rich in coal and timber, also contain iron ore, petroleum, and natural gas.
Allegheny Plateau
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The Allegheny Plateau is a large dissected plateau area in western and central New York, northern and western Pennsylvania, northern West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau.
The plateau extends southward into western West Virginia, eastern Kentucky and Tennessee where 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 region in 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 900 to 1,500 feet (270 to 460 m). By the Allegheny Front, however, elevations may reach well over 4,000 feet (1,200 m), with relief of up to 2,000 feet (610 m).
One of the more notable geologic areas within the Allegheny Plateau is the Hocking Hills region of southeast Ohio.
Geology and physiography
The Allegheny Plateau is a physiographic section of the larger Appalachian Plateau province, which in turn is part of the larger Appalachian physiographic division.[1]
References
- ^ "Physiographic divisions of the conterminous U. S.". U.S. Geological Survey. http://water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml. Retrieved on 2007-12-06.
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Mentioned in
- New River
- Du Bois (city, Pennsylvania)
- Allegheny Mountains
- Altoona (city, Pennsylvania)
- Appalachian Mountains (mountains, North America)
- Pennsylvanian
- West Virginia (state)
- Glaciated Allegheny Plateau
- Unglaciated Allegheny Plateau
- Pennsylvania (American history)
- Dissected plateau
- New York (state, United States)
- State Resources, Industries, Features, and Attractions
- Dysart Woods
