Long″mynd rocks″ (?). (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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.