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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.)
The Allegheny Front forms part of the Appalachian Structural Front, separating the Appalachian Plateau from the Appalachians' Ridge and Valley Province. [1] The various other escarpments along this structural feature include the Catskill Escarpment to the northeast and the Cumberland Escarpment to the southwest. [1]
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 .
These plateaus, such as the Allegheny Plateau, are considered provinces of the Appalachian Highlands and the mountains assigned to them are instead considered pieces of dissected plateaus. [ 4 ] Additionally, subranges and ridges of subranges (Such as the Yew Mountains ) are inconsistently related to the Appalachian Mountain Range.
The Allegheny National Recreation Area is a national recreation area of the United States, located on the Allegheny Plateau in northwestern Pennsylvania. It is administered by the United States Forest Service as part of the Allegheny National Forest.
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.
The Pennsylvania Wilds, or the Pennsylvania Wilds Conservation Landscape, is a predominantly rural and forested region in northern central Pennsylvania, mostly within the Allegheny Plateau. It covers about a quarter of the state's territory, but is home to only 4% of its population. It is one of Pennsylvania's 11 state-designated tourist regions.