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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.
Toward the end of the last century, the recognition of lithological folding and faulting, both synchronous with and subsequent to thrusting, has provided further insight into the mechanisms of emplacement of vast allochtons [22] which need not be just clay and sand, but can as well be valuable ores for the production of such strategic materials like uranium, molybdenum and rhenium.