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.

Source: Webster's Revised Unabridged Dictionary (1913)