Physical Geography. Designating a deposit or feature formed in situ by the weathering of rock; (also) designating a soil largely composed of such…

Of a rock formation, sedimentary deposit, etc.: consisting of or formed from transported material which was originally accumulated elsewhere; not…

Of a mineral: formed in situ, at the same time as or later than the rock or deposit of which it forms part. Also: designating crystal growth…

= authigenic, adj.

Geology. Of a rock formation, sedimentary deposit, etc.: that has formed in its present position or from indigenous material. Also: of or relating…

Intermediate in character between autochthonous and allochthonous; formed from material that has been transported or displaced a relatively short…