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).

Origin of allochthonous

1910–15; allo- + -chthonous, modeled after autochthonous

British Dictionary definitions for allochthonous

allochthonous
/ (əˈlɒkθənəs) /

adjective

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

Word Origin for allochthonous

C20: from Greek allokhthon, from allo- + khthōn (genitive khthonos) earth