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| | Allegheny Plateau. The Columbia Gazetteer of North America. 2000 |
 | | Allegheny Plateau (A-luh-GAI-nee), dissected plateau, W part of the Appalachian Mts., extending c.500 mi/805 km SW from N Pa. to SW Va., including W Md., rising to 4,860 ft/1,481 m at Spruce Knob, the highest peak in W.Va. The E Allegheny Plateau, known as the Allegheny Mts. |
 | | or the Alleghenies, has a steep E-facing escarpment often called the Allegheny Front (c.1,500 ft/460 m1,600 ft/490 m high) and is more rugged than the W portion. |
 | | The plateau, consisting of flat-laying sedimentary rock, has been subsequently eroded to produce a rugged boundary. |
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