Bulletin - United States Geological Survey Volume 589 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt: ...from 0.2 to 0.5 inch wide. Its grain diameters are 0.18-1.8, mostly 0.37-1.1 millimeters, and it is thus of about grade 5 (coarse). The pinkish tint is probably due to manganese oxide and the green toactinolite. Some of the bands contain a brownish mica, phlogopite. Some of the marble (specimens D, XXXIII, 42, ci e, g, j) contains more actinolite and more manganese oxide, and consequently shows a deepening of the colors. It also has black streaks of biotite. Parts of this marble (specimen k) are of grade 6 (extra coarse) with grain diameters up to 0.2 or even 0.3 inch. The colors of these marbles are very attractive, but the exposures are insufficient for determining either the quantity of the stone or the solidity and thickness of its beds. TOWNSHEND. Marble occurs at a road corner about a mile east-southeast of Townshend village and about 500 feet above it, on the Horace Gale (formerly Sharon Gray) farm. Here are the remains of a kiln used about 50 years ago.1 There are outcrops and small openings on both sides of the east-west road and about south of the house (locality 41, fig. 5). The outcrops indicate a width of about 85 feet of marble, with finely foliated biotite gneiss on both sides striking N. 25 E. and dipping more or less steeply. Some of the marble (specimens D, XXXIII, 41, a, b) is in alternating white or faintly rose-tinted and light-greenish beds a few inches thick. This is a calcite marble, the rose color, as in other localities, being probably due to manganese oxide and the green to actinolite. The calcite grains (in one section much twinned and slightly flexed) have diameters of 0.11-1.48 and even 2.38 millimeters, but mostly 0.37-1.48 millimeters (in a hand specimen up to 0.2 inch), and the marble is thus of grades 5 to 6 (coarse to extr...