"autochthonous" in the adjective sense
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"
Source: WordNet® (An amazing lexical database of English)
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