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allochthon

[uh-lok-thuh n, -thon]

noun Geology.

a geological formation not formed in the region where found and moved to its present location by tectonic forces.Compare autochthon(def 3).

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. 2019