ig in the city hall at Philadel-I 
in Washington Monument at 
imenl at Morri^town, N. J.1 
center monument at (ircemvood 
160 THE GRANITES OF MAINE. 
lathe for stones 12 by 4 feet, 1 gang of steam saws, and 1 single 
steam saw for use with steel shot. 
Transportation is effected by cartage on a track 300 foot from 
quarry to mill and 300 feet thence to wharf on Pleasant River Bay. 
The product is used for monuments and interior decorations and 
finds market in the cemeteries of Brooklyn, Boston, ChicagJ 
Louisville, Denver, and other cities. As will be noticed from the 
spacing of the joints and sheets, the dimensions of the blocks are 
limited. The usual sizes shipped measure 2 feel 6 inches by 2 feet 
inches by 1 foot and also 3 to 6 feet by 1 foot by 1 foot. The largest 
block shipped measured 6 feet by 1 feet 6 inches by I feet 6 inches. 
During the writer's visit in August, L905, the men were endeavoring 
to quarry a block which measured 17 feet by 9 feet, the third dimen- 
sion of which was still uncertain. 
Specimen work- : Base of wainscoting in the city hall at PhiladeU 
phia; tablet with Welsh incription 
Washington, I>. (.: Danforth mom 
Zeller monument at Lewisburg, Pa.: <•( 
Cemetery, Brooklyn, X. Y.: and mantlepiece in public library at 
Machias, Me. Contract in l!>n;>. memorial to Architect French in 
New York. 
The Thornberg black granite </"<in>/ i- in the town of Addison, 3 
miles south of Addison village. Operator, A. M. Thornberg, Addi- 
son, Me. 
The rock (specimens 94, a and 94, aa) is a hyperstheno-^abbro oi 
almost black -hade and of medium ophitic texture. There are km 
varieties — a dark one. which i-- externally identical with that exam 
ined from the Plea-ant River quarry, and a lighter one. in wind 
the white mottling due to the feldspar is a little more abundant 
Under the micro-cope this -tone i- generally identical with that of th< 
Plea-ant River quarry, except that in the thin section of this ol 
the feldspar is labradorite and there is no olivine. This, however 
may not he characteristic of the rock a- a whole. A little \\i'r^>>{)Y} 
pyrite and apatite and a good-sized particle of secondary epidoto wer< 
also found in the Thornberg gabbro. The stone takes a very fin< 
polish and the hammered or cut surfaces are almost white. 
The Black I>><im<>n<I ( ;,■<<,, '<!<■ quarry is in the town of Addison, oi 
Yoho Bay. Owned by Black Diamond Granite Company of Xev 
York; address, Basin, Me., or care 11. Donald, tax collector, Addison 
Me. 
The rock (specimen 91, a) i- a hypersthene gabbro of very dark 
gray shade, with slight brownish tinge and of line to medium ophiti 
texture, consisting, in descending order of abundance, of a whitisl 
soda-lime feldspar (andesine) in not greatly elongated crystals! 
