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The Appalachian Plateau province is divided into seven physiographic sections: Mohawk, Catskill, Southern New York, Allegheny Mountains, Kanawha, Cumberland Plateau, and the Cumberland Mountains. Each section is classified under the Appalachian Plateau province because of its similarities in geologic makeup, topography, and wildlife.
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.
The Allegheny Group, often termed the Allegheny Formation, [2] is a Pennsylvanian-age geological unit in the Appalachian Plateau.It is a major coal-bearing unit in the eastern United States, extending through western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio.
Location of Kittanning Gap after GNIS finding of 'Kittanning Gap, Pennsylvania' seen in USGS National Map viewer screenshot. The gap is located effectively in a western suburb of Altoona. • The maps on this page also are showing the nearby PRR Horseshoe Curve which crosses watercourses cutting three other gaps.
South of Mount Porte Crayon and Seneca Creek, the Appalachian structural front is less clearly unified. Pottsville-capped Spruce Mountain, south and east of Seneca Creek, continues the Allegheny Front's geology southward; [5] this ridge reaches an elevation of 4,863 feet (1,482 m) at Spruce Knob, West Virginia's highest
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 Ohio River roughly bisects the Unglaciated Allegheny Plateau in generally a north-northeast to south-southwest direction. Other significant rivers in the plateau include the Muskingum River and Tuscarawas River in Ohio, the Youghiogheny River and Allegheny River in Pennsylvania, and the Monongahela River and Kanawha River in West Virginia.
Paleogeographic reconstruction showing the Appalachian Basin area during the Middle Devonian period. [9] The "Pennsylvania Salient" in the Appalachians appears to have been formed by a large, dense block of mafic volcanic rocks that became a barrier and forced the mountains to push up around it. 2012 image from NASA's Aqua satellite.