QUARRIES IN KNOX COUNTY. 127 
The rock (specimen 16, a) is a norite of very dark gray shade and 
fine to medium texture, consisting, in descending order of abun- 
dance, of an unaltered colorless to smoky feldspar containing both 
soda and lime (andesine to labradorite), hypersthene partly altered 
to brown hornblende, black mica (biotite) in scales up to 0.2 inch, 
and magnetite, together with accessory pyrite. 
The quarry, opened in 1888, is about 50 feet square and from 10- 
15 feet deep and is provided with one derrick. 
The stone has to be carried 10 miles to the cutting works at South 
Thomaston, although the quarry itself is within one-fourth mile of 
seaboard. 
The product is used entirely for monuments. Specimen struc- 
tures : The soldiers' monuments at Warren and Union, in Maine. 
The Flat Ledge quarry, in the town of St. George, north of Clark 
Island, consists of several small openings (" motions ") operated by 
Edwin Edwards. Address, Clark Island. 
The granite (specimen 13, a) is a biotite-muscovite granite of dark- 
gray color and fine, even-grained texture, with flow structure, con- 
sisting, in descending order of abundance, of a white potash feldspar 
(microcline and orthoclase), clear or barely smoky quartz, w T hite soda- 
lime feldspar (oligoclase), black mica (biotite), and white mica 
(muscovite). But for its fine texture and less abundant muscovite 
this granite would belong in group 10, page 74. 
The paving blocks are carted 1J miles to wharf. 
The Weskeag quarry is in the town of South Thomaston, 1 mile 
west of Pleasant Beach, which is 7 miles south of Rockland. Oper- 
ator, C. E. Hudson, South Thomaston. 
The granite (specimen 1-12, a) is a biotite-muscovite granite of 
slightly bluish medium-gray color and of medium to coarse, even- 
grained texture, with feldspars up to one-half inch and mica 0.15 
inch. It consists, in descending order of abundance, of light-bluish 
potash feldspar (orthoclase and microcline), smoky quartz, bluish or 
white soda-lime feldspar (oligoclase), black mica (biotite), and white 
mica (muscovite), together with accessory garnet, magnetite, and 
apatite. The oligoclase is partly altered to kaolin and a white mica. 
iThin sections show a marked rift, described on page 27 and shown 
in fig. 1 (p. 28). The stone takes a fine polish, but the abundance 
and size of the mica plates are not favorable to the durability of the 
polish under outdoor exposure. 
The quarry, reopened in 1905, and still in process of development, 
covers about an acre of ground and has an average depth of 20 feet. 
The sheets are horizontal and tapering, lenticular. Joints strike 
N. 80° E. and dip 80° south. Rift is vertical and strikes N. 80° E. 
Brain is horizontal. (Quarry data collected by Mr. E. S. Bastin, of 
:he United States Geological Survey.) 
