allochthonous

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allochthonous

[ə′läk·thə·nəs]
(ecology)
Pertaining to organisms or organic sediments in a given ecosystem that originated in another system.
(petrology)
Of rocks whose primary constituents have not been formed in situ.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.