388 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
rial, which is often trimmed with an ax or saw, and used as building 
stone. It is said to be a durable material, hardening on exposure. 
The clay shown at several of the pits w T as too dark in color, and too 
free from sand or grit, to resemble closely the typical stoneware 
clays. It seems probable that Morrow's pits at least are in the ball 
clays of the Lignitic (Tertiary). 
JACKSON, MADISON COUNTY, TENN. 
The plant of the Jackson Pottery Company is located near the 
intersection of the Mobile and Ohio and Nashville, Chattanooga and 
St. Louis railroads. Only stoneware is manufactured. The clay is. 
ground in one mill, worked by two horses, the amount ground per 
day being H to 2 tons. One down-draft kiln is used, fired with Ken- 
tucky coal, and holding 5,000 gallons of ware. The clay used is a 
mixture, in equal parts, of clay from pits near Jackson and of that 
from Morrow's pits near Pinson. The slip used is from Albany, 
N. Y., and from East St. Louis, the latter being a "flint" and "spar" 
mixture. 
The clay pits near Jackson, from which the Jackson Pottery Com- 
pany procures its material, are located about 1 mile from Jackson 
along the road to Claybrook post-office. The section shown in these 
pits is as follows: 
Red sands (Lafayette formation) ? 
White sands to 10 feet. 
Yellow, red, gray, and whitish sands in irregular streaks. 4 to 5 feet. 
Clay - 5 feet. 
White sand 1 foot. 
Clay 8 inches. 
White sand for at least 1 foot; no deeper exploration. 
The 5-foot bed of clay is separated into layers 4 to 6 inches thick 
by thin partings of sand, which is cleaned off before loading. The 
contact here between the upper white sand and the red Lafayette 
appears to be conformable and very regular. These clays are poorer 
than those from Pinson, and can not be used without mixing with 
the latter. 
HOLLOW ROCK, CARROLL COUNTY, TENN. 
Clays from the vicinity of Hollow Rock are shipped to Nashville, 
Tenn. These pits, however, could not be reached during the field 
work. 
HICO, CARROLL COUNTY, TENN. 
Clay is now being dug from pits located about 3 miles southeast of 
McKenzie, and shipped from Hico station to potteries at Akron, 
Ohio; East Liverpool, Ohio, and Louisville, Ky. 
