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Adjective: autochthonous  o'tók-thu-nus
  1. Of rocks, deposits, etc.; found where they and their constituents were formed
  2. Originating where it is found
    "autochthonous rocks and people and folktales";
    - autochthonal, autochthonic, endemic, indigenous, desi [Asia]

See also: native

Antonym: allochthonous

Encyclopedia: Autochthonous