The sparingly fossiliferous conglomerates, grits, schists, and states of Great Britain, which lie at the base of the Cambrian system; -- so called, because typically developed in the Longmynd Hills, Shropshire.
LONGMYND ROCKS
Meaning of LONGMYND ROCKS in English
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012