'Harlech group' definitions:

Definition of 'Harlech group'

From: GCIDE

Harlech group \Har"lech group`\ (h[aum]r"l[e^]k gr[=oo]p`). [So called from Harlech in Wales.] (Geol.) A minor subdivision at the base of the Cambrian system in Wales. [1913 Webster]