The Collaborative International Dictionary
Cumbrian system
Cumbrian \Cum"bri*an\ (k?m"br?-an), a. Pertaining to Cumberland, England, or to a system of rocks found there.
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.