Bulletin - United States Geological Survey Volume 285-287 (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. 1906 Excerpt: ...The clay fuses at Seger cone No. 8 and has a total shrinkage of 15 per cent, or about one-seventh. At this heat it burns to a white-creamish color. The rational analysis of Tennessee ball clay No. 1 is as follows: Analysis of Tennessee ball clay No. 1. Clay substance 86.20 Feldspar 2.70 Flint 11.10 Tennessee ball clay No. 3.--This clay has a brown color when dry, mixes well with water, and will pass through a 120-mesh sieve without residue. By passing it through a 175niesh sieve it leaves 10 per cent residue, which consists mainly of fine sand. Tho shrinkage at cone 1 is 12.5 per cent, or one-eighth; at cone 8 the shrinkage is 18 per cent, or about one-sixth. The color of the clay at cone 0.010 is white; at cone 1 the color is still white, and at cone 8 it fuses to a gray body. The rational analysis of Tenneasee ball clay No. 3 is as follows: Analysis of Tennessee ball clay No. 3. Clay substance 91.35 Feldspar 2.70 Fl int 5.95 The location of the Peryear pit and of the three Mandle pits described above throws much light on the age of the fine deposits of ball and sagger clays in this section of the State. The lowest member of the Tertiary which has been recognized in Henry County is the Porters Creek clay or "soapstone." It occurs in the deep ravine at Couyersville, 3 miles east of Peryear. According to barometric measurement, the Porters Creek clay at Conyersville is 50 feet lower than the clay pit at Peryear. Wells 100 feet deep at Peryear get waterbeforc reaching the Porters Creek clay. The dip to the west is therefore at least 30 feet per mile. The Mandle pits, located 3 miles west and north of Whitlock, are at least 5 miles west of the Porters Creek outcrop, and are therefore in the lower Tertiary. The age of the ball clay near India is not s...