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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 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.
Spruce Mountain, visible behind Judy Rocks, in eastern West Virginia; the summit of Spruce Mountain, Spruce Knob, is the highest point in the Alleghenies at 4,863 feet (1,482 meters). Allegheny Mountains in the Monongahela National Forest of West Virginia seen from the slopes of Back Allegheny Mountain looking east.
Similarly steep escarpments sharing much of the same geologic structure are also present nearby along the eastern slopes of Allegheny Mountain and Back Allegheny Mountain (along with the southern end of Shavers Mountain), but these mountains lack the Pottsville caps characteristic of the Allegheny Front. [5] Allegheny Mountain's long, nearly ...
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 Allegheny Ridge is prominently shown in the map center-left, the gaps of the Allegheny Front are located in the border area between Cambria County (uplands) and Huntingdon County (lowlands). USGS - Appalachians Mountain chain showing the lines of the barrier ridges in central, western, and northwestern Pennsylvania.
Blue Knob (elevation 3,146 feet (959 m)) is a summit in the eastern United States with a broad dome that is the northernmost 3,000-footer in the Allegheny Mountains.It is the highest point in Bedford County, Pennsylvania.
The Tygart Valley River rises in the Allegheny Mountains in Pocahontas County and flows generally north-northwestwardly through Randolph, Barbour, Taylor and Marion counties, past the towns of Huttonsville, Mill Creek, Beverly, Elkins, Junior, Belington, Philippi, Arden, and Grafton, to Fairmont, where it joins the West Fork River to form the Monongahela River. [6]