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Alleghanian orogeny
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The Alleghanian orogeny or Appalachian orogeny is one of the geological mountain-forming events that formed the Appalachian Mountains and Allegheny Mountains. The term and spelling Alleghany orogeny w
Major fault at the dividing line between the Allegheny Plateau and the true Appalachian Mountains (Williamsport, Pennsylvania).
Major fault at the dividing line between the Allegheny Plateau and the true Appalachian Mountains (Williamsport, Pennsylvania).
Geology of the Appalachians
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The geology of the Appalachians dates back more than 1.2 billion years to the Mesoproterozoic era when two continental cratons collided to form the supercontinent Rodinia. The rocks exposed in today's
Alleghanian orogeny
…to the metamorphism of the rock (i.e. the transformation of igneous and sedimentary rock into metamorphic rock). The sedimentary rock in the eastern Appalachian Basin region was squeezed into great folds that ran perpendicular to the direction of forces. The greatest amount of deformation associated with the Alleghanian…
Looking Glass Rock from the Art Loeb Trail.
Looking Glass Rock from the Art Loeb Trail.
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 f
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.