The Allegheny Plateau ( / ˌ æ l ɪ ˈ ɡ eɪ n i / AL -ig- AY -nee ) is a large dissected plateau area of the Appalachian Mountains in western and central New York , northern and western Pennsylvania , northern and western West Virginia , and eastern Ohio . It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau .
5-560: The Glaciated Allegheny Plateau is that portion of the Allegheny Plateau that lies within the area covered by the last glaciation . As a result, this area of the Allegheny Plateau has lower relief and gentler slopes than the relatively rugged Unglaciated Allegheny Plateau . In general, the glaciated lies to the north and west of the unglaciated, and forms an arc in northeastern to southeastern Ohio lying between
10-595: A few hundred square kilometers owing to the blockage the steep relief of the mountains provides at the edge of the ice sheet – contains only old drift now buried by long periods of soil development. Major cities on the Glaciated Allegheny Plateau are Akron and Youngstown . 41°N 81°W / 41°N 81°W / 41; -81 Allegheny Plateau The plateau extends southward into western West Virginia , eastern Kentucky , and Tennessee , where it
15-743: 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 through Maryland and 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 south of
20-620: 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). The Allegheny Plateau
25-619: The glacial till plains and the Unglaciated Allegheny Plateau. The Glaciated Allegheny Plateau extends into a belt of southern New York State and the central Susquehanna River basin. A small area of the Allegheny Plateau was glaciated during the Wisconsin Stage , the late Illinoian Stage , and Pre-Illinoian B and G glaciations of the Pre-Illinoian Stage . This area – only
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