A PRELIMINARY REPORT ON CLAYS OE FLORIDA 
179 
Ries 1 reports a white calcareous clay outcropping on the property of 
W. B. Stoutamire, eighteen miles southwest of Tallahassee, Sec. 1, T. 
1 S., R. 4 W., and a brick-clay on the property of J. D. Stoutamire in Sec. 
15, T. 1 S., R.. 4 W. This last clay, according to the same investigator, 
has good plasticity, 40 per cent of water of plasticity, 17 per cent air- 
shrinkage, 5 per cent fire-shrinkage at cone 05, and a tensile strength 
ranging from 175 to 210 pounds per square inch. Incipient fusion begins 
at cone 05 and the clay burns to a hard, dense product at cone 2. Its 
color is a very light buff. 
Ries 2 reports a calcareous clay also on the property of W. W. Will¬ 
iams, about one-half mile southeast of Jackson Bluff, on the Ocklocknee 
River, in Sec. 21, T. 1 S., R. 4 W. The clay outcrops in the bed and 
along the sides of a small creek. The material is overlain by about five 
feet of sandy alluvium, and two and one-half feet thickness of clay is 
exposed. This clay has 45 per cent water of plasticity, 16 per cent air- 
shrinkage, tensile strength ranging from 300 to 388 pounds per square 
inch with an average of 338, 5 per cent fire-shrinkage at cone 01 and 12 
per cent at cone 5. Vitrification seemed to occur at about cone 6 and 
viscosity at cone 8. 
None of these clays can be used alone in the manufacture of clay 
products. The air-shrinkage of the J. D. Stoutamire clay and the Will¬ 
iams clay is too high, but if sand or other clays are added to reduce 
shrinkage a light-colored face brick may be made. 
A bluish-black, very plastic clay is exposed in Double Creek in the 
southwest corner of Sec. 8, T. 1 S., R. 3 W., on the property of Hugh 
Black. The clay is three feet in thickness, is overlain by soil and sand 
ranging from six to twenty feet, and overlies a marl. This clay likewise 
has a high air-shrinkage. 
None of the clays of this Jackson Bluff region may be considered as 
of commercial importance at the present time as no transportation is 
nearer than about eighteen miles. 
The chemical analyses of the Stoutamire and Williams clays are 
given below: 
^ies, H., Clays of United States East of Mississippi River, U. S. Geological 
Survey Prof. Paper No. 11, p. 83, 1903. 
2 Loc. Cit. 
