106 THE GRANITES OF MAINE. 
The plant consists of 1 derrick and 1 hoisting engine, 
Transportation is had by track to wharf, LOO feet distant. 
This quarry was idle in 1905 and is worked only on special orders. 
The product is used for monuments, bases, etc., and finds its way 
usually to New London, Conn. The minor sheets and remnants are 
worked up into paving blocks. 
The granite of the same firm's upper quarry, opened in 1890 
(specimen 26,&),is abiotite graniteof general pinkish buff-gray coloi 
and coarse even-grained texture, consisting of pinkish-buff potash 
feldspar, smoky quartz, cream-colored soda-lime feldspar and black 
mica. The potash feldspar measures up to an inch or more in length, 
and the biotite scales one-tenth inch. This stone appears to be 
identical with that of the Latty quarry on Green Isle (specimen 28, a)\ 
The upper quarry is 200 by 100 feet, and averages about 15 feet in 
depth. The quarry drainage supplies the boiler. 
Rock structure: The sheets are from 1 to 5 feet thick, and dip 5° 
to 10° E. and \Y. Vertical joints strike X. 50°-60° W. and parallel 
to the rift. For a space of 50 feet across the middle of the quarry 
these recur at intervals of from 2 to 8 feet. Another set, less numer- 
ous, strikes X. 25° W. and dip 60 E. There is an irregular tapering 
dike of pegmatite, with pink and white feldspar, biotite. and muscol 
vite. The sheets in upper pari of quarry have "shakes' 1 for 2 to 3 
inches from their surface. 
The plant consists of 1 derrick and 2 steam drills. 
Transportation is effected by cable and engine along a track 900- 
feet long to a dock' on easl side of the island. 
The product consists of random stone and goes to New London, 
Conn. 
The Latty Brothers quarry is in the southeast part of Green Island, 
which lies 1 mile southeast of Stonington. (See map, fig. 15.) 
Operators, Latty Brothers, Stonington. Me. 
The granite (specimen 28, a) is a biotite granite of pinkish-buff 
color and coarse, even-grained texture, consisting of a pinkish-buff 
potash feldspar, smoky quartz, cream-colored soda-lime feldspar, and 
black mica. The potash feldspar measures up to an inch, and the 
biotite up to 0.15 inch in diameter. The stone appears to be identical 
with that of the upper quarry of S. Clinton Sherwood Company, on 
Crotch Island. 
Rock structure: The sheets are from feet to 6 feet S inches thick 
and dip gently southeast. There are vertical joints striking X. 
45° AY., spaced 6 to 12 feet, also forming a heading. The rift is 
vertical, with course N. 00° W. 
The quarry was opened in the spring of 1905. The plant consists 
of 3 derricks, 2 engines, and 1 steam drill. 
Transportation is effected along a track 100 feet long to wharf. 
