A PRELIMINARY REPORT ON CLAYS OF FLORIDA 179

 Ries' 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 airshrinkage, 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.
 Ries2 reports a calcareous clay also on the property of W. W. Williams, 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 airshrinkage, 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 Williams 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:
 1Ries, H., Clays of United States East of Mississippi River, U. S. Geological Survey Prof. Paper No. 11, p. 83, 1903.
 2Loc. Cit.