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[uh-lok-thuh n, -thon]
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noun Geology.
  1. a geological formation not formed in the region where found and moved to its present location by tectonic forces.Compare autochthon(def 3).
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Origin of allochthon

First recorded in 1940–45; back formation from allochthonous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018