QUARRIES IN HANCOCK COUNTY. 101 
yrown soda-lime feldspar (oligoclase-andesine, , smoky quartz, and 
lark-green hornblende, together with accessory magnetite, apatite, 
md secondary chlorite. The feldspar is largely altered to a white 
nica. A similar granite occurs also 1| miles west-northwest of it, at 
he Carroll quarry, in the town of Tremont, at the south foot of Dog 
Mountain. (See p. 116.) 
The quarry measures 100. by 50 feet and 10 feet in depth at the 
leepest point. The sheets are up to 6 feet thick and dip 5°-10° W. 
Fhere is much discoloration. 
The Sedgwick quarries consist of 6 small openings in the town of 
Sedgwick, about three-fourths mile northwest of Sedgwick village, 
operated by the W. G. Sargent Company, of Sargentville. 
The granite (specimen 42, a) is a biotite granite of coarse to 
nedium even-grained texture, like that of one of the Bucks Harbor 
quarries (specimen 46, a, p. 88), consisting of light cream-colored 
feldspars, smolry quartz, and black mica, all in marked contrast, 
rhe feldspars measure up to three-fourths inch in length and the 
biotite plates one-tenth inch. 
The rift is vertical, with a strike of N. 22° W. The plant consists 
Df 2 hand derricks. The product, consisting entirely of paving 
blocks, is carted 1^ miles to the wharf at Sedgwick. 
The Stonington quarries. — The granite industry which centers in 
Stonington is distributed over an area of about 4 miles square. (See 
map, fig. 15.) Some of the quarries are on Deer Isle, others are 
south of it, on Crotch Island, so named from the inlet which divides 
it, and the rest are on neighboring islets. Of the latter, however, 
only those on Moose, Green, and Spruce islands were in operation in 
1905. 
The southern half of Crotch Island, which measures about 1,500 
feet from north to south, shows sheet structure very clearly. (See 
PI. II, B.) The sheets slope off to the northwest 'and the southeast 
at angles of 10°, 15°, 20°, and 25° from its central part (140 feet 
above sea level), where they are horizontal. The east-west vertical 
joints are conspicuous from a distance. The Goss quarry lias cut 
into the center of the arch and also on either side of it, while the 
Ryan-Parker quarry (PL III, .1), on the south, is on the southeast 
slope of the sheets and of the hill. In the northern half of Crotch 
Island, at the lower quarry of the Sherwood Company, the coarse 
granites are in contact with a fine-textured one, which is also ex- 
ploited. The contact line is vertical, but the sheets traverse both 
granites indifferentty. The Stonington quarries, as will be seen from 
the descriptions, embrace several varieties of granite. 
The Ryan-Parker quarry is on Crotch Island, in its southeastern 
part, at Thurlow Head. (See PL II, #, and fig. 15.) Operators, 
