[uh-lok-thuhn, -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 ).

1940–45; back formation from allochthonous Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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In any event, the distance traveled by the allochthon is a matter of opinion in the absence of any convincing evidence.
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