( a. )
Of or pertaining to the lowest division of the Carboniferous formations underlying the proper coal measures. It was a marine formation characterized in general by beds of limestone.
( a. )
Of or pertaining to the lowest division of the Carboniferous formations underlying the proper coal measures. It was a marine formation characterized in general by beds of limestone.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012