This quarry was "on Clark Island, in the town of St. George, about 12 miles south-southwest of Rockland." The owner was the Rodgers Granite Corporation, 271 West 125th Street in New York. The granite from the quarry was reportedly a bluish-medium gray with a fine to medium texture.
The Clark Island Quarry opened about 1870. In 1905 the quarry measured 500 by 300 feet and had a maximum depth of 50 feet and an average depth of 25 feet. Transport of the granite was by horse power on a track 900 to 1,200 feet to the wharf.
Granite from the Clark Island Quarry was used in the following examples: the post offices in Hartford, Connecticut, and Buffalo, New York; and the Standard Oil Building in New York.