autochthonous
/ɔːˈtɒkθənəs/adjective
1- (of an inhabitant of a place) indigenous rather than descended from migrants or colonists（居民）土著的。
1.1
- Geology (of a deposit or formation) formed in its present position【地质】（沉积物或其形成）原地（生成）的。常与 ALLOCHTHONOUS 相对。