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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.
The Allegheny National Forest is a National Forest in Northwestern Pennsylvania, about 100 miles northeast of Pittsburgh. The forest covers 513,175 acres (801.8 sq mi; 2,076.7 km 2 ) of land. Within the forest is Kinzua Dam , which impounds the Allegheny River to form Allegheny Reservoir .
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 Highlands forests are a temperate broadleaf and mixed forests ecoregion located in a large part of the Allegheny Plateau physiographic province, including both unglaciated and glaciated portions, in Pennsylvania and New York within North America, [2] as defined by the World Wildlife Fund.
The bridge across the river carries Pennsylvania Route 120 Pennsylvania Wilds (in green) on the map of Pennsylvania. 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 ...
The areas are a remnant of the original forest that once covered 6 million acres (24,000 km 2) on the Allegheny Plateau of New York and Pennsylvania. The old growth forest consists of 300- to 400-year-old American beech, Eastern hemlock and some sugar maple. Other tree species are yellow birch, sweet birch, black cherry, red maple, American ...
Between 1890 and 1920, loggers cleared most of the Allegheny Plateau. Save for a few pockets of old growth forest, the current forests, which contain most of the presettlement species in different relative abundances and distribution, originated at that time. The heavy cutting favored hardwoods and created massive amounts of coniferous slash ...
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 ...