A PRELIMINARY REPORT ON CLAYS OF FLORIDA 181

 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 950*C. 2.4 18.10 32.50 Red.
 1050 2.4 18.00 32.20 Red.
 1150 4.9 14.75 31.90 Red.
 1190 5.4 14.80 30.50 Red.
 1230 5.9 13.10 28.20 Red.
 1310 6.4 12.80 23.20 Red.
 While many of these residual clays are adapted to the manufacture of burned products, it is to be noted that a great many others are not. The light-yellow or buff raw clays quite free from sand, found in many places in this region, are, as a rule, unfitted for burned products.
 A white, plastic clay, free from sand, is encountered at a depth of thirty-nine feet on the property of J. H. Link, at Bronson. A white, plastic clay also underlies portions of the region about Chiefland at a depth of twenty or more feet. Samples adequate for testing were not available.
 A yellowish-white calcareous clay is found underlying portions of Inglis, but its lime content is too high for use in burned products.

 LIBERTY COUNTY
 Liberty County lies in middle Florida between the Ocklocknee and




















 FIG. 27.-Clay exposed on the Apalachicola River at Estiffanulga Bluff, Liberty County.