a. 含有角石的

Corniferous \Cor*nif"er*ous\ (k?r-n?f"?r-?s), a. [L. cornu horn
+ -ferous.] (Geol.)
Of or pertaining to the lowest period of the Devonian age.
(See the Diagram, under {Geology}.) The Corniferous period
has been so called from the numerous seams of hornstone which
characterize the later part of the period, as developed in
the State of New York.