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  1. Originated by Gumbel and applied to rocks, the dominant constituents of which have not been formed in place. CF: autochthonous Holmes, 1
  2. Coal formation according to the drift theory. Nelson
  3. Formed or produced elsewhere than in its present place; of foreign origin, or introduced. The term is widely applied; e.g., to coal or peat that originated from plant material transported from its place of growth, or to an allochthon on a low-angle thrust fault. The term is similar in meaning to allogenic, which refers to constituents rather than whole formations. Ant. autochthonous. See also: allochthon
    Source: Dictionary of Mining, Mineral, and Related Terms

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