1G4 
THE GRANITES OF MAINE. 
consist of shattered surface rock and include a bed a foot thick of 
sand, due to interstitial weathering. The courses of joints and dikes 
are shown in fig. 3G. A recurs at intervals of 2 to 10 feet, I> at inter- 
vals of 10 feet, C still less frequently. There are also irregular joints, 
which break the rock up into irregular blocks. 
A dike of pinkish aplite, described on page 61, from 4 to 8 feet 
thick, runs the entire length of the quarry on the west. A 1-inch 
dike of white aplite dips 15° S. Similar ones recur at frequent inter- 
vals. Some strike northward and curve. A dike of olivine basalt, 
referred to on page 61, occurs also on the west side or front of the 
quarry, and is crossed by brandies from the large pinkish aplite dike. 
The rift is horizontal and the grain vertical, trending north-north] 
east to south-southwest. Thus, altogether, the structure and injec- 
tions are complex and render the quarrying of large blocks difficult 
Notwithstanding this, blocks 
by i) feet by 20 inches have 
been obtained, and one 12 by 12 
by 6 feet was in sight in 1905. 
The plant consists of a der- 
rick, engine, and pump. 
Transportation involves cart- 
age of 4 miles to the company's 
cutting mill at Redbeach and a 
further cartage of one-fourth 
mile to wharf on St. Croij 
River. 
The product is used entirely 
for monuments, of which the 
soldiers' monument at Calais is 
Fig 
Structure at the Beaver Lake dioritc 
quarry, Calais. 
;• specimen. 
The Shut fuel,- M o u a 1 a in 
quarry i> in the town of Calais. 3 miles west -southwest of Redbeach 
village, on Shattuck Mountain. Operator, Maine Red Granite Com- 
pany : office at Redbeach. Me. 
The granite (specimen 104, b ) i> a biotite granite of dark reddish- 
greenish gray color and medium to coarse even-grained texture, with 
feldspars up to one-half inch and sparsely disseminated biotite under 
one-tenth inch. It consists, in descending order of abundance, of a 
reddish potash feldspar (orthoclase), smoky quartz, greenish soda- 
lime feldspar (oligoclase), and black mica (biotite), together w r itl 
accessory magnetite, apatite, and secondary chlorite. The oligoclase if j 
here and there partially altered to a white mica. The smallness anc \ 
sparseness of the micas are favorable to the durability of its polish. 
The quarry, opened in 1890. consists of three openings on the soutl 
side of an east to west ridge. The principal one of these measure 
