catskill period

from The Collaborative International Dictionary of English v.0.48

Catskill period \Cats"kill pe`ri*od\ (Geol.)
   The closing subdivision of the Devonian age in America. The
   rocks of this period are well developed in the Catskill
   mountains, and extend south and west under the Carboniferous
   formation. See the Diagram under {Geology}.
   [1913 Webster]