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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 .)
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The Allegheny Front extends for about 180 miles (290 km) southwesterly from south-central Pennsylvania through western Maryland, then divides the eastern panhandle of West Virginia from the rest of that state. The name "Allegheny Front" is applied to the escarpment throughout much of its extent, although it is little used in Maryland.
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 plateau has a slight slant towards the northwest, making it higher on the eastern side. [2] A large portion of the plateau is a coalfield, which was formed approximately 320 million years ago during the Pennsylvanian Age. [3] The plateau was subjected to glaciation during the Pleistocene ice age. As a result, the topography of this section ...
The escarpment in which Red Rock Mountain is located is a part of the Allegheny Plateau. This summit features a firetower, known as "Grandview" all located within the Ricketts Glen State Park . The views from the top of the mountain are impressive and varied.
The Allegheny Front seen in the right of this photograph Blue Knob in Pennsylvania and its wintry valley below This list of ridges and summits of the Allegheny Mountains identifies geographic elevations for about 500 miles (800 km) from north central Pennsylvania , through eastern West Virginia and western Maryland , to western Virginia in the ...