104 
THE GRANITES OE MAINE. 
The Goss quarry is on Crotch Island, adjacent to and north of the 
Ryan-Parker quarry, on Thurlow Head. (See fig. 15 and PL II, B.) 
Operator, John L. Goss; office, Stonington, Me. 
The granite is a biotite granite, identical with that of the Ryan- 
Parker quarry (specimen 20, «), described on page 102. The linn 
reports that a test of this stone made by the New York Dock Depart- 
ment showed a breaking weight of 18,000 pounds to the square inch. 
The quarry, opened in about 1872, measures about 350 feet square; 
has a maximum depth of 120 feet and a minimum depth of 10 feet. 
Pumping is necessary in rainy weather. Little or no stripping has 
been required. 
Rock structure: The sheets vary from 1 to 30 feet in thickness. 
Fig. i<. Structure al Goss quarry, Crotch Island. 
increasing rapidly in thickness downward. They are horizontal in 
the center of the quarry, but south of it dip up to 20° SE. and north 
of it as steeply to the northwest. The joint courses and rift are 
shown in fig. IT. Of A there are only two or three in the quarry. 
Their faces are coated with epidote. There is no sap, but pyrite 
occurs in small particles rarely. 
The plant consists of 8 derricks and 8 hoisting engines, 2 cable 
engines for drawing cars, 1 compressor (Ingersoll & Sargent, com- 
pound), with a capacity of 350 cubic feet of air per minute. 5 steam 
drills. 16 pneumatic hand tools, and 2 pumps. 
Transportation is effected by means of three tracks — one 100, one 
400, and one 500 feet long — from the quarry to the dock, the card 
being propelled by cable engines. 
The product is used chiefly for bridges and buildings. The small 
beds are worked into paving blocks. New York is the chief market. 
Specimen buildings of granite from this quarry are the post-office in 
Lowell, Mass.; the court-house at Dedham, Mass.; the Cadet armory 
at Boston; the public library at Laconia, X. 11., and the Ninth Regil 
