A PRELIMINARY REPORT ON CLAYS OF FLORIDA 213

 This is a flood-plain deposit having a thickness of more than ten feet and a two-foot overburden of sand. The Louisville and Nashville Railroad, at Argyle, is the nearest shipping point.
 The clay is red-burning and is suitable for a good grade of structural materials. Its physical properties are:
 Physical Properties of Edwards Clay, Argyle (Lab. No. 0-o8).
 Plasticity, judged by feel............ Excellent.
 W ater of plasticity................. 26.40%
 Pore water ....................... 1.01%
 Shrinkage water .................. 25.39%
 Linear air shrinkage............... 8.00%
 Volume air shrinkage.............. 27.80%
 Modulus of rupture, average........ 349.7 pounds per square inch.
 Steel hard at cone 1.
 Fire tests:
 Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950'C. 0.3 20.29 34.35 Brick red.
 1050 1.0 20.77 36.85 Brick red.
 1150 1.8 11.11 24.75 Brick red.
 1190 7.0 9.00 21.40 Brick red.
 1230 7.0 8.67 21.65 Brick red.
 1310 7.0 8.21 21.86 Brick red.
 1370 7.0 6.29 18.60 Brick red.
 1430 9.0 0.65 8.45 Brick red.

 A sandy surface-clay occurs on the property of Perry L. Biddle, one mile south of DeFuniak Springs. It burns to a friable and porous red-colored product and therefore is suitable only for a common brick of inferior quality.
 A white, sandy, micaceous clay, containing some coarse quartz, occurs on the property of G. P. Billups in Sec. 26, T. 2 N., R. 19 W., five miles south of DeFuniak Springs on the Freeport road. The sand, mica and gravel content of this clay renders it useless for manufacturing purposes in its present form. It is probable that the clay would be of some value when washed. The nearest shipping point is DeFuniak Springs.
 A black plastic clay occurs on the property of R. W. Thompson, one mile north of DeFuniak Springs. This stratum is ten feet in thickness and is overlain by twenty feet of sand. Sand also underlies the clay strata. This is a white-burning clay. Its exceedingly heavy overburden probably prevents it from having any commercial value at the present time.