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allochthonous Syllabification: al·loch·tho·nous
Pronunciation: /əˈläkTHənəs/

Definition of allochthonous in English:


Denoting sediment or rock that originated at a distance from its present position. Often contrasted with autochthonous.
Example sentences
  • The fossils of the westernmost exposures of the Hoko River Formation are allochthonous, preserved in reworked concretions within conglomerates that were deposited as part of a submarine fan system during late Eocene time.
  • However, this does not prove that the Moine rocks necessarily constitute an allochthonous terrane in the North American sense.
  • Although some skeletal remains are evidently allochthonous, other remains are probably parautochthonous.


Early 20th century: from allo- 'other' + Greek khthōn 'earth' + -ous.

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