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The Ridge-and-Valley Appalachians, also called the Ridge and Valley Province or the Valley and Ridge Appalachians, are a physiographic province of the larger Appalachian Highlands division. The physiographic province is divided into three sections: the Hudson Valley, the Central, and the Tennessee. [1]
The region is a large broad ridge with a steep ascent from east to west and rolling hills away from the ridge. The Allegheny Front reaches its highest elevation in Pennsylvania at Blue Knob, 3,136 feet (956 m), an unusual bulge along this symmetrical ridgeline. Streams that cut into the ridge are often shallow and steep.
The Great Valley, especially Shenandoah Valley, played an important role during the American Civil War, including its Blue Ridge gaps and nearby Piedmont area and its northward extension to Gettysburg, Pennsylvania, where the bloodiest and most influential Civil War battle was fought in the Battle of Gettysburg from July 1 to July 3, 1863.
The northwestern border of the county is approximately at the Allegheny Front, a geological boundary between the Ridge and Valley Province and the Allegheny Plateau (characterized by relatively flat-lying sedimentary rocks of late Paleozoic age). (PA Geological Survey Map 13)
A shaded map of the Cumberland Plateau and Ridge-and-Valley Appalachians on the Virginia–West Virginia border. Central: The central section runs from the Hudson Valley in New York to the New River through the Lehigh Valley and central Pennsylvania and western Maryland to western Virginia and West Virginia.
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]
Folded rock layers of the Valley and Ridge in Georgia, as well as their flat-lying equivalents in the Appalachian Plateau, include limestone, sandstone, shale and other sedimentary rocks. Many of these rocks serve as important economic resources in the state, including construction-grade limestone, barite , ochre and small amounts of coal . [ 5 ]
The Valley and Ridge province is a physiographic province of the larger Appalachian division, located in the eastern United States. It is bordered on the east by the Blue Ridge and Piedmont provinces and on the west by the Appalachian Plateau. There are three sections of the province, the Hudson section, the Central section, and the Tennessee ...