autochthonous -- (of rocks, deposits, etc.; found where they and their constituents were formed)
autochthonal, autochthonic, autochthonous, endemic, indigenous -- (originating where it is found; "the autochthonal fauna of Australia includes the kangaroo"; "autochthonous rocks and people and folktales"; "endemic folkways"; "the Ainu are indigenous to the northernmost islands of Japan")