A PRELIMINARY REPORT on clays oe elorida 
153 
This clay is underlain by sand and sandy clay. The overburden ranges 
from one to six feet. This clay is free from sand, but contains small 
amounts of very fine mica flakes. Its physical properties are: 
Physical Properties of Muscogee Cut Clay (Lab. No. 0-4). 
Plasticity, judged by feel. Excellent. 
Water of plasticity. 27.90% 
Pore water. 0.68% 
Shrinkage wmter. 27.22% 
Linear air shrinkage. 6.4% 
Volume air shrinkage. 18.2% 
Modulus of rupture, average. 214.3 pounds per square inch. 
Slaking test. 1 hour. 
Steel hard at cone 1. 
Overfires at cone 15. 
Fire tests: 
Temperature. 
Linear Shr. 
Per Cent. 
Absorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
950°C. 
0.9 
19.75 
36.43 
Pink. 
1050 
0.1 
18.32 
35.81 
Pink. 
1150 
5.1 
9.25 
16.58 
Buff. 
1190 
5.1 
9.42 
14.23 
Buff. 
1230 
5.6 
6.50 
12.39 
Cream. 
1310 
5.6 
5.30 
11.04 
Cream. 
1370 
6.1 
0.49 
2.17 
Gray. 
1430 
4.6 
1.05 
5.41 
Gray. 
On the property of I. L. Schaffer on the Pensacola and Alabama 
Railroad, about eleven miles northwest of Pensacola, is another exposure 
of a similar clay. This is gray and brown mottled, occurring in a very 
irregular deposit overlain unconformably by a cross-bedded sand. The 
clay underlies an extensive area in this locality, but is quite variable in 
thickness. In places it is as much as fifteen feet thick. It has the fol¬ 
lowing physical properties: 
Physical Properties of Schaffer Clay (Lab. No. 0-40). 
Excellent. 
Plasticity, judged by feel.... 
Water of plasticity. 
Pore water. 
Shrinkage water. 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Steel hard at cone 05. 
26.15% 
0.18% 
25.97% 
8.3% 
23.95% 
262.8 pounds per square inch. 
30 minutes. 
