Definition of allochthonous in English:

allochthonous

adjective

Geology
  • Denoting a deposit or formation that originated at a distance from its present position.

    Often contrasted with autochthonous
    • ‘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.’
    • ‘Although some skeletal remains are evidently allochthonous, other remains are probably parautochthonous.’
    • ‘These rocks are also of biogeographic interest because unlike truly allochthonous terranes they are parautochthonous with respect to the craton.’
    • ‘However, this does not prove that the Moine rocks necessarily constitute an allochthonous terrane in the North American sense.’
    • ‘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.’

Origin

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

Pronunciation

allochthonous

/əˈlɒkθənəs/