allochthonous
adjective
al·loch·tho·nous
variants:
or less commonly allocthonous \ -thənəs \
Definition of allochthonous
1a
: of or relating to the rocks of an allochthon
b
of coal
: formed elsewhere than in situ and hence not autochthonous
c
of limestone
: composed largely of organic debris moved far from the place where the base organisms lived
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