Carboniferous :: Carboniferous (a.) Producing or containing carbon or coal.

Subcarboniferous :: Subcaliber (a.) Smaller than the caliber of a firearm.

Subcarboniferous :: Subcarboniferous (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.

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