allochthonn.
/əˈlɒkθ(ə)n/, /əˈlɒkθɒn/, U.S. /əˈlɑkθ(ə)n/, /əˈlɑkˌθɑn/, /æˈlɑkθ(ə)n/, /æˈlɑkˌθɑn/ Geology.
An allochthonous rock or mineral formation; esp. a part of a faulted formation that has been displaced by tectonic forces. Contrasted with autochthon n. 4.In quot. 1895 in predicative use with the sense of allochthonous adj. (after German allochthon, adjective: see allochthonous adj.).
ΘΚΠ
the world > the earth > structure of the earth > structural features > [noun] > formation > by origin in place
authigenesis1888
allochthon1895
autochthon1895
1895 Nature 15 Aug. 374/1 Whether coal is allochthon, i.e. formed from vegetable material deposited elsewhere than on its place of origin; or is autochthon, or formed by the decay of plants in situ.
1931 Bull. Amer. Assoc. Petroleum Geologists 15 1001 The substratum, underlying the overriding masses, regardless of whether the latter consists of one nappe or several, is called the autochthone. The overthrust complex is named the allochthone.
1942 M. P. Billings Struct. Geol. x. 181 Rocks..have traveled many miles from their original place of deposition and are said to be allochthonous..these rocks are sometimes called the allochthon.
1979 Nature 27 Sept. 267/1 Thin slices of Precambrian basement are incorporated within and between the various allochthons.
2007 G. Barreiro et al. in U. Linnemann et al. Evol. Rheic Ocean 318/1 Late Cambrian to Early Ordovician magmatism is widespread in the upper and basal allochthons and also in the autochthon.
This entry has been updated (OED Third Edition, September 2012; most recently modified version published online December 2021).
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n.1895- interestedness
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