Webster’s Revised Unabridged Dictionary · 1913
Cumbrian
Cum′bri·an (k?m′br?-a]/>n), 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.