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The Valley and Ridge Province was formed during the Alleghanian orogeny, a mountain-building event that occurred between 325 and 260 million years ago. [2] The rocks in the region were subjected to immense pressure and heat, causing them to deform and fold.
[2] Pleistocene glaciers have also repeatedly visited the state over the last 100,000 years. These glaciers have left some evidence and carved out much of the landscape of the northern tier of the state. [2] A rock with high economic value from Pennsylvania is anthracite coal. Before mining began, there was an estimated 22.8 billion tons of ...
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)
Blue Mountain, Blue Mountain Ridge, or the Blue Mountains of Pennsylvania is a ridge of the Appalachian Mountains in eastern Pennsylvania.Forming the southern and eastern edge of the Ridge-and-Valley Appalachians physiographic province in Pennsylvania, Blue Mountain extends 150 miles (240 km) from the Delaware Water Gap on the New Jersey border in the east to Big Gap in Franklin County in ...
The Poconos, or the Pocono Mountains region, is a mountainous region of about 2,400 square miles (6,200 km 2) located in Northeastern Pennsylvania, approximately 30 miles north of Allentown, which is a nationally popular recreational winter destination for skiing, snowboarding, and other winter sports and (in off-season months) for hiking ...
The ridge line runs north from Rocky Gap State Park in Maryland, across the Mason–Dixon line into Pennsylvania and then to the west Martin Hill, passing very near Tussey Mountain in Snake Spring Valley. The ridge then turns west, wrapping around north of Bedford, Pennsylvania to its intersection with Dunning Mountain, dividing Dunning Cove ...
Penns Valley is an eroded anticlinal valley of the Pennsylvania ridge and valley geologic region of the Appalachian Mountain range. The valley is located in southern Centre County, Pennsylvania . Along with the Nittany Valley to the north and east, it is part of the larger Nittany Anticlinorium. [ 1 ]
Bald Eagle Mountain is in the western part of the Ridge and Valley province of the Appalachian Mountains. Brush Mountain and the neighboring Nittany Mountain and Tussey Mountain ridges are part of the same Paleozoic anticline, the limbs of which consist of the older Ordovician Bald Eagle Formation (), Juniata Formation (interbedded sandstone and shale), and younger Silurian Tuscarora Formation ...