JEFFERSON COUNTY. 119 
Feet. 
5. Dark lignitic clay with two bands of lignite 5-9 
6. White sand 4-8 
7. Laminated dark shaly clay 11 
8. Dark-bluish sandy marl 22 
Of the clays exposed in this section No. 3 is probably the most 
promising. They are well worth testing in any case. The nearness 
of these beds to water transportation on Arkansas River gives them 
additional importance. 
These beds may continue across the country and at other places 
may be found under a thinner covering than that overlying them at 
this place. 
CLAY INDUSTRY. 
Pine Bluff. — Six yards were formerly engaged in the manufacture 
of soft-mud bricks at Pine Bluff. The bricks were all made by hand 
and dried in open yards. In many instances the bricks were insuffi- 
ciently dried and burned, and as a result a very common and inferior 
product was made. These yards have all sold out, quit business, or 
consolidated, and at present there are but two plants doing business 
in the city. 
Pine Bluff Brick Company. — This plant was incorporated in 1892. 
Common soft-mud bricks are made. The bricks are molded by steam 
in a Hercules Senior machine, and dried artifically thirty-six hours in 
a Standard drier. Six to seven days are necessary for burning after 
they are thoroughly dried. They are burned in up-draft kilns, which 
have a capacity of 375,000 to 400,000 bricks. Wood is used for 
burning, about three-fourths of a cord per thousand bricks being used. 
The capacity of the plant is 40,000 bricks a day. The bricks are 
made from a sandy surface clay. Size of green bricks 2\ by 4| by 
9 inches; shrinkage, none. 
Conley brick plant. — A small brick plant is operated by J. H. Con- 
ley at Redfield, in the northwestern part of the county. The plant 
was established in 1898. The bricks are made from the common 
yellow surface clay. They are dried in the sun and burned in an 
up-draft kiln of 50,000 capacity. The bricks are sufficiently dried 
in two days to place in the kiln, and are burned in about seven days. 
Hard wood is used as fuel, about one-half cord being used for burn- 
ing a thousand bricks. When thoroughly burned the shrinkage in 
a kiln 10 feet high is about 6 inches. The daily capacity of the 
machine is 5,000 bricks. 
0' Neal dc Rogers plant. — A plant has recently been established at 
Pine Bluff by Messrs. O'Neal & Rogers, but no particulars concern- 
ing it were obtained. 
