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Alleghenian orogeny |
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Alleghenian orogenyformerly Appalachian RevolutionMountain-building event that affected the Appalachian Geosyncline in the late Permian period (c. 286–248 million years ago). The Alleghenian orogeny is most pronounced in the central and southern Appalachian Mountains and produced the different effects in various subregions: compressional folding and faulting of the Valley and Ridge Province, westward thrusting of the Blue Ridge, and folding and minor metamorphism and igneous intrusion in the Piedmont Province. It may have resulted from the collision (see plate tectonics) of the central and southern Appalachian continental margin with that of North Africa in the Permian period. Alleghenian orogeny [¦al·ə¦gān·ē·ən ȯ′räj·ə·nē] (geology) Pennsylvanian and Early Permian orogenic episode which deformed the rocks of the Appalachian Valley and the Ridge and Plateau provinces. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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, 1998; Waldron and van Staal, 2001 and references
therein), whereas the Alleghenian orogeny was due to continent collision
during final closure of the Rheic Ocean. |
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