\Ne`o*co"mi*an\, n. [From Neocomium, the Latin name of
Neuchatel, in Switzerland, where these rocks occur.] (Geol.)
A term applied to the lowest deposits of the Cretaceous or
chalk formation of Europe, being the lower greensand.

\Ne`o*co"mi*an\, a. (Geol.)
Of or pertaining to the lower greensand.