aSubcarboniferous(Geol) 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.
Century Dictionary and Cyclopedia
subcarboniferousIn geology, a name given by some geologists to the mountain-limestone division of the Carboniferous series, or that part of the series which lies beneath the millstone-grit. See carboniferous.