An allochthon , or an allochthonous block, is a large block of rock which has been moved from its original site of formation, usually by low angle thrust faulting . The term is derived from Greek: allo , meaning other, and chthon , meaning earth. For other possible mechanisms see obduction .
3-687: An allochthon which is isolated from the rock that pushed it into position is called a klippe . If an allochthon has a "hole" in it so that one can view the autochthon beneath the allochthon, the hole is called a " window " (or fenster). In generalized terms, the term is applied to any geologic units that originated at a distance from their present location. In the United States there are three notable allochthons, all of which were displaced nearly 50 km (31 miles) along thrust faults. The Golconda and Robert Mountains allochthons are both found in Nevada ,
6-593: A product of the Antler orogeny in the late Devonian period. Another is the Taconic allochthons found in New York , Massachusetts and Vermont formed from the collision of the Taconic magmatic arc with the super-continent Laurentia in the late Cambrian period. This article about structural geology is a stub . You can help Misplaced Pages by expanding it . Klippe A klippe ( German for cliff or crag)
9-645: Is a geological feature of thrust fault terrains. The klippe is the remnant portion of a nappe after erosion has removed connecting portions of the nappe. This process results in an outlier of exotic, often nearly horizontally translated strata overlying autochthonous strata. Klippes may also be found in the Pre-Alps of Switzerland and some of the isolated mountains in Assynt , Sutherland, in NW Scotland. This article about structural geology
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