
In structural geology, 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. 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 autoc.....
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http://en.wikipedia.org/wiki/Allochthon

allochthon A mass of rock hat has been transported a great distance from its original place of deposition, usually by tectonic forces; such as, over thrusting or gravity sliding.
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http://www.wordinfo.info/words/index/info/view_unit/467/

a geological formation not formed in the region where found and moved to its present location by tectonic forces. Cf. autochthon (def. 3).
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https://www.infoplease.com/dictionary/allochthon
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