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n. pl. al·loch·thons or al·loch·tho·nes (-thə-nēz′)
1. One that originated or was formed in a place other than where it is found, especially a rock formation that has been displaced.
2. A member of a human population that relocated or was displaced from a particular area.
3. Ecology A plant or animal that is not indigenous.

[German : allo-, allo- (from Greek, from allos, other; see al- in Indo-European roots) + Greek khthōn, earth; see dhghem- in Indo-European roots.]
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References in periodicals archive ?
Perhaps the most important practical results of the Caledonian orogeny are massive mature and multi-folded black alum shale deposits in Jamtland, Sweden and the possible allochton from the same or similar source at Sillamae, Estonia.
Considering all these contradictions a simple solution, emplacement of orogenic allochtons presents itself.
This tectonic allochton covers as part of Miocene foredeep, as older, Variscan consolidated tectonic level, which represents a submerged continuation of the Epivariscan platform of the Bohemian Massif.