1. (

• autochthonous

) of rocks, deposits, etc.; found where they and their constituents were formed ;

2. (

• 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" ;