allochthonous

[ uh-lok-thuh-nuh s ]
/ əˈlɒk θə nəs /

adjective Geology. (of rocks, minerals, etc.)

not formed in the region where found.Compare autochthonous(def 4).

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Origin of allochthonous

1910–15; allo- + -chthonous, modeled after autochthonous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for allochthonous

allochthonous
/ (əˈlɒkθənəs) /

adjective

(of rocks, deposits, etc) found in a place other than where they or their constituents were formedCompare autochthonous (def. 1)

Word Origin for allochthonous

C20: from Greek allokhthon, from allo- + khthōn (genitive khthonos) earth
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012