QUARRIES IN SOMERSET COUNTY. 149 
SOMERSET COUNTY. 
The granite quarries in Somerset County are in the towns of Hart 
land and Norridgewock. 
The Hartland quarry is in the town of Hartland, near Hartland 
village, on the Sebasticook and Moosehead Railroad. The quarry 
was not operated in 1905, but was formerly operated by Joseph H. 
Baker. Property reported as owned by the Linn estate. 
The rock (specimen 111, a, collected by Dr. George Otis Smith), 
is a quartz diorite with conspicuous black particles on a more bluish 
than yellowish white ground, and of medium to coarse, even-grained 
texture with flow structure. It consists, in descending order of 
abundance, of a translucent milk-white soda-lime feldspar (oligo- 
clase), very slightly smoky quartz, black mica (biotite), black horn- 
blende, and accessory titanite and magnetite. Some of the feldspars 
are cloudy from incipient alteration. 
The Dodlin quarry is in the town of Norridgew T ock, on the north- 
east side of Dodlin Hill, which lies 2J miles south of Norridgewock 
village, and has a north-northeast-south-southwest axis and a height 
of 350 feet above the general level and of 650 feet above sea level. 
Operator, Dodlin Granite Company; office, Oakland, Me. 
The rock (specimens 116, a, and 116, b) is a quartz monzonite of 
two shades. Specimen 116, a, is a general medium gray with con- 
spicuous black particles on a white ground, and specimen 116, b, 
is a general light gray with much finer black particles on a ground 
of mixed white and gray. Both rocks have a like texture, medium 
inclining to fine, with porphyritic crystals of white feldspar up to 
one-half inch. In the darker rock (116, a) the biotite scales measure 
up to one-tenth inch, while in the lighter they rarely attain one- 
twentieth inch. Both varieties consist, in descending order of abun- 
dance, of a slightly bluish milk-white soda feldspar (oligoclase) and, 
in equal or slightly less amount, of a whitish potash feldspar (micro- 
cline), quartz, almost clear in the darker rock (116, a) and light 
smoky in the lighter one (116, b), and black mica (biotite) (consider- 
able in 116, a, but much less in 116, b), with accessory magnetite, 
titanite, zircon, pyrite, and secondary epidote and white micas. Some 
of the feldspars are radially intergrown with quartz. a In the darker 
variety, owing to the clearness of the quartz and the abundance and 
coarseness of the biotite, the contrast is simply between the black 
mica and the white feldspar, but in the lighter variety, owing to the 
smokiness of the quartz and the smallness of the biotite scales, the 
contrast, although not very marked, is between the gray quartz, white 
feldspar, and black mica. 
" " Structure vermiculee " of Michel Eevy : Bull. Carte geol. de France, No. 36, vol. 5, 
1893-4, pp. 27-28, fig. 5. 
