156 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
pany about one mile north of Molino station. The Dolores Brick Com¬ 
pany has been located here about twenty years, but the Pensacola Brick 
Company is just completing the erection of its plant and is now in readi¬ 
ness to market its product. The McMillan Brick Company formerly 
operated a plant about three miles north, of Molino. 
The clay exposed in this locality is eighty or more feet in thickness. 
Sixty feet of clay are exposed in one of the Dolores pits and borings 
twenty feet deep in the floor of workings did not penetrate the bottom. 
The clay also extends for a considerable distance northward and west¬ 
ward. 
In each exposure at this locality the clay is cross-bedded and is 
interstratified with numerous sand layers. The sand layers are thin while 
the clay strata are thick and relatively pure. The run of bank is used at 
both plants and the sandy material is thoroughly mixed with the pure 
clay. The raw clay is brownish-gray in color, has good plasticity and 
working qualities and dries easily. It is a light, red-burning clay. 
Both plants using this clay make face brick and common brick. 
Their principal markets are in west Florida and southern Alabama, 
Mississippi and Louisiana. Pensacola, Mobile and New Orleans are the 
heaviest users of the Dolores product. 
This clay may be equally well used for hollow block ware, fireproof¬ 
ing, and drain tile. It is not suitable, however, for paving brick, sewer- 
pipe, or other vitrified products. It has the following physical properties : 
Physical Properties of Dolores Brick Company Clay (Lab. No. 0 - 1 ). 
Plasticity, judged by feel. Excellent. 
Water of plasticity. 22.90% 
Pore water. 1.05% 
Shrinkage water. 21.85% 
Volume air shrinkage. 21.05% 
Linear air shrinkage. 7.3 % 
Modulus of rupture, average. 237.4 pounds per square inch. 
Slaking test. 1 hour. 
Steel hard at cone 15. 
Fire tests: 
Temperature. 
950 c 
1050 
1150 
1190 
1230 
1310 
1370 
1430 
C. 
Linear Shr. 
Per Cent. 
0.3 
0.3 
0.3 
0.3 
0.7 
0.7 
0.7 
1.7 
Absorption. 
Per Cent. 
17.31 
17.13 
16.18 
13.51 
13.36 
12.89 
12.47 
9.03 
Porosity. 
Per Cent. 
34.15 
33.68 
33.33 
31.98 
31.00 
30.68 
29.80 
26.84 
Color. 
Light red. 
Light red. 
Brick red. 
Brick red. 
Brick red. 
Brick red. 
Brick red. 
Brick red. 
