formerly 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.
* * *▪ geologymountain-building event, occurring almost entirely within the Permian Period (299 million to 251 million years ago), that created the Appalachian Mountains.The Alleghenian orogeny resulted from the collision of the central and southern Appalachian (Appalachian Mountains) continental margin of North America with that of North Africa in late Paleozoic time. It is most pronounced in the central and southern Appalachians and produced the compressional folding (fold) and faulting (fault) of the Ridge and Valley Province (Ridge and Valley); the westward thrusting of the Blue Ridge over Ridge and Valley rocks; and folding, minor metamorphism, and igneous (igneous rock) intrusion in the Piedmont Province (Piedmont) of the eastern United States. Evidence of the Alleghenian orogeny is less prominent in the northern Appalachians, but late Paleozoic folding and igneous intrusions are present along both the east coast of New England in the United States and parts of the eastern Maritime Provinces of Canada.
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Alleghenian orogeny — The Alleghenian orogeny or Appalachian orogeny is one of the geological mountain forming events (orogeny) that formed the Appalachian Mountains and Allegheny Mountains. The term and spelling Alleghany Orogeny (sic) originally proposed by H.P.… … Wikipedia
orogeny — orogenic /awr euh jen ik, or euh /, orogenetic, adj. /aw roj euh nee, oh roj /, n. Geol. the process of mountain making or upheaval. Also called orogenesis /awr euh jen euh sis, or euh /. [1885 90; ORO 1 + GENY] * * * I Mountain building event,… … Universalium
Orogeny — Geologic provinces of the world (USGS) Shield … Wikipedia
Taconic Orogeny — Mountain building event that affected the Appalachian Geosyncline along the eastern coast of the U.S. Evidence for the orogeny is most pronounced in the northern Appalachian Mountains, but its effects can be noted as far away as Tennessee and… … Universalium
Variscan orogeny — The Variscan (or Hercynian) orogeny is a geologic mountain building event caused by Late Paleozoic continental collision between Laurasia and Gondwana to form the supercontinent of Pangea.NamingThe name, Variscan , comes from the Medieval Latin… … Wikipedia
Appalachian orogenic belt — Mountain range that extends more than 1,860 mi (3,000 km) along the eastern margin of North America, from Alabama to Newfoundland. It was formed by the progressive eastward addition of material to the continental margin of North America. The… … Universalium
Carboniferous Period — Interval of geologic time 354–290 million years ago, marked by great changes in world geography. All the landmasses drew closer together as a result of tectonic plate movements. The supercontinent Gondwana occupied much of the Southern Hemisphere … Universalium
Permian Basin — ▪ area, Texas, United States also called West Texas Basin large sedimentary basin in western Texas and southeastern New Mexico, U.S., noted for its rich petroleum, natural gas, and potassium deposits. Due to its economic importance, it is one… … Universalium
Allegheny Mountains — Geobox|Range name=Allegheny Mountains image caption=Spruce Knob country=United States state=Pennsylvania| state1=Maryland| state2=West Virginia| state3=Virginia parent=Ridge and valley Appalachians border=Cumberland Mountains| border1=… … Wikipedia
Cane Creek Mountains — Geobox|Range name=Cane Creek Mountains native name= other name=Bass Mountains image caption=Bass Mountain (Left) and Cane Creek Mountain (Right), 2 of the highest peaks in the range. country=United States state type= region=Alamance County… … Wikipedia