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The Geology of Pennsylvania consists of six distinct physiographic provinces, three of which are subdivided into different sections. Each province has its own economic advantages and geologic hazards and plays an important role in shaping everyday life in the state.
Oblique air photo facing north of central Bedford County, Pennsylvania, in December 2006, showing Wills, Evitts, and Tussey Mountains from center to right. Roadcut along Rt. 30 (Everett bypass) through Warrior Ridge, showing the lower Devonian sequence from the Corriganville Limestone at left to the Ridgeley Sandstone to the Needmore Shale at ...
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 ...
Paleogeographic reconstruction showing the Appalachian Basin area during the Middle Devonian period. [9] The "Pennsylvania Salient" in the Appalachians appears to have been formed by a large, dense block of mafic volcanic rocks that became a barrier and forced the mountains to push up around it. 2012 image from NASA's Aqua satellite.
The Endless Mountains are a geographical, geological, and cultural region in Northeastern Pennsylvania. [1] The Endless Mountains region includes Bradford, Sullivan, Susquehanna,and Wyoming counties. The highest peak in the region is the North Knob of Elk Mountain at 2,693 feet (821 meters). The dissected plateau is a subrange of the ...
The gaps of the Allegheny, [1] [2] meaning gaps in the Allegheny Ridge (now given the technical name Allegheny Front) in west-central Pennsylvania, is a series of escarpment eroding water gaps (notches or small valleys) along the saddle between two higher barrier ridge-lines in the eastern face atop the Allegheny Ridge or Allegheny Front ...
The mountain is a core geographic feature throughout much of the Pennsylvania side of the Lehigh Valley. The mountain is called the Reading Prong by geologists. [4] Unlike Blue Mountain to its north, South Mountain does not follow a straight geographic line. The mountain ranges in elevation between 500 and 1,300 feet (150 and 400 m) above sea ...
The Allegheny Group, often termed the Allegheny Formation, [2] is a Pennsylvanian-age geological unit in the Appalachian Plateau.It is a major coal-bearing unit in the eastern United States, extending through western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio.