Cumbrian /(k?m"br?-an)/

Cum·bri·an

Cumbrian

a.
  1. Pertaining to Cumberland, England, or to a system of rocks found there.

Phrases & Compounds
Cumbrian system
the slate or graywacke system of rocks, now included in the Cambrian or Silurian system; -- so called because most prominent at Cumberland.