Definition of allochthonous in English:
allochthonous
adjective əˈlɒkθənəsəˈläkTHənəs
Geology Denoting a deposit or formation that originated at a distance from its present position.
Often contrasted with autochthonous
Example sentencesExamples
- The allochthonous units that overlie the eastern part of this terrane were probably emplaced when the Magnitogorsk volcanic arc collided with this margin in late Devonian times.
- Although some skeletal remains are evidently allochthonous, other remains are probably parautochthonous.
- 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.
- These rocks are also of biogeographic interest because unlike truly allochthonous terranes they are parautochthonous with respect to the craton.
Origin
Early 20th century: from allo- 'other' + Greek khthōn 'earth' + -ous.