autochthon
/ɔːˈtɒkθ(ə)n//ɑˈtɑkˌθɑn/
noun
- 1
The earliest inhabitant of an area; an aborigine.
- 2
A large mass of rock in the place of its original formation, rooted to its basement (foundation rock) as opposed to an allochthon or nappe which has shifted from the place of formation; an autochthonous rock formation.
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