The Great Valley Carbonate subunit consists of limestone and dolomite rock that covers about 70 percent of the Great Valley.
(The Great Valley Carbonate subunit; consists; of limestone and dolomite rock) (limestone and dolomite rock; covers; about 70 percent of the Great Valley)
The Great Valley Carbonate subunit limestone and dolomite rock
consists covers
of limestone and dolomite rock
about 70 percent of the Great Valley