cumbrian system

from The Collaborative International Dictionary of English v.0.48

Cumbrian \Cum"bri*an\ (k?m"br?-an), a.
   Pertaining to Cumberland, England, or to a system of rocks
   found there.
   [1913 Webster]

   {Cumbrian system} (Geol.), the slate or graywacke system of
      rocks, now included in the Cambrian or Silurian system; --
      so called because most prominent at Cumberland.
      [1913 Webster]