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.