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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.
A 1775 map of the Allegheny Plateau and Mountain Range. Trans-Allegheny travel had been facilitated when a military trail—Braddock Road—was blazed and opened by the Ohio Company in 1751. (It followed an earlier Indian and pioneer trail known as Nemacolin's Path.)
Other high points along the front include the Dolly Sods Wilderness in West Virginia, a broad, rocky plateau at an elevation of about 4,000 feet (1,200 m); Dan's Rock on Dans Mountain in Maryland at 2,895 feet (882 m); and Blue Knob in northern Bedford County, Pennsylvania, with an elevation greater than 3,120 feet (950 m).
[2] [3] The escarpment is the northeastern extremity of the Allegheny Plateau. It rises steeply from the Hudson Valley below, with an elevation difference of approximately 700 feet (from 400 to 1,100 feet) over a horizontal distance of approximately 2,000 feet.
Elevation: 2,449 ft (746 m) ... Topo map(s) USGS Red Rock, PA: ... The escarpment in which Red Rock Mountain is located is a part of the Allegheny Plateau.
The Unglaciated Allegheny Plateau is located in an arc around southeastern Ohio, West Virginia, into western Pennsylvania and a small portion of southwestern New York State. This area is a dissected plateau , characterized by sandstone , shale , and many coal seams.
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. [1] This area – only 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 ...
The elevation of the plateau is ... The Allegheny Front reaches its highest elevation in ... Pennsylvania has been updating its base geologic map last printed in 1980