'Longmynd rocks' definitions:

Definition of 'Longmynd rocks'

From: GCIDE
  • Longmynd rocks \Long"mynd rocks"\n. pl. (Geol.) The sparingly fossiliferous conglomerates, grits, schists, and slates of Great Britain, which lie at the base of the Cambrian system; -- so called, because typically developed in the Longmynd Hills, Shropshire. [1913 Webster]