autochthonous (adj)

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

autochthonal, autochthonic, autochthonous, endemic, indigenous (adj)

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"

autochthonous (Adjective)

Native to the place where found; indigenous.

autochthonous (Adjective)

Originating where found.

autochthonous (Adjective)

Buried in place, especially of a fossil preserved in its life position without disturbance or disarticulation.