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allochthon

[uh-lok-thuh n, -thon] /əˈlɒk θən, -θɒn/
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).
Origin of allochthon
1940-1945
1940-45; back formation from allochthonous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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