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The eastern head of the Ridge and Valley region is marked by the Great Appalachian Valley, which lies just west of the Blue Ridge. The western side of the Ridge and Valley region is marked by steep escarpments such as the Allegheny Front, the Cumberland Mountains, and Walden Ridge. The Valley and Ridge is located on the west side of the Blue ...
Valley and Ridge province of the Appalachian Highlands physiographic division; to the north is the Hudson section, then the central section, and to the south the Tennessee section. 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 ...
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While the Appalachian Highlands and Appalachian Uplands are generally continuous across the U.S./Canadian border, the St. Lawrence Valley area is handled differently in the physiographic classification schemas. The part of the St. Lawrence Valley in the United States is one of the second-level classifications, part of the Appalachian Highlands.
The state's Ridge and Valley province is home to one of Pennsylvania's most profitable coal fields in history, containing high-grade anthracite coal. The sediments deposited during the Mississippian Period came from highlands located to the southeast. Waves of mountain-building occasionally brought coarser-grained sediments onto the plain.
The US uses the term Appalachian Highlands, and Canada uses the term Appalachian Uplands, to define contiguous regions that have similar geology, topography, history, and native plant and animal communities. (The Appalachian Mountains are not synonymous with the Appalachian Plateau, which is one of the provinces of the Appalachian Highlands).
Mount Nittany is part of the Ridge and Valley province of the Appalachian Mountains. [5] The neighboring Bald Eagle , Tussey and Shriner mountains are part of the same sedimentary formation, consisting of, from youngest to oldest, Tuscarora Formation quartzite , Juniata Formation shale , and Bald Eagle Formation sandstone .
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]