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From Wikipedia, the free encyclopedia. An autochthon in structural geology is a large block or mass of rock which is in the place of its original formation relative to its basement or foundation rock. It can be described as rooted to its basement rock as opposed to an allochthonous block or nappe which has been relocated from its site of formation.
auÂ·tochÂ·thoÂ·nous. adj. 1. Originating or formed in the place where found; indigenous: autochthonous rocks; an autochthonous people; autochthonous folk tales.See Synonyms at native. 2. Ecology Native to or produced within a system: an autochthonous species; algae that provide an autochthonous source of nutrients in a lake.. native to or formed in the place where found. 3. Pathol. located in a part of the body in which it originated, as a cancer or infection. 4. Psychol. of or pertaining to ideas that originate independently of normal modes of thought or influences, as an obsession or schizophrenic construct.