A PRELIMINARY REPORT ON CLAYS OF FLORIDA 207

 Fire tests:
Temperature. Linear Shr. Absorption. Porosity. Color.
 Per Cent. Per Cent. Per Cent.
 9500C. 0.8 14.79 33.20 Reddish brown.
 1050 0.8 14.80 33.60 Reddish brown.
 1150 0.8 14.37 33.10 Reddish brown.
 1190 0.8 14.53 32.00 Reddish brown.
 1230 0.8 14.95 21.50 Reddish brown.
 SUWANNEE COUNTY
 Suwannee County is located in north Florida and is underlain by the Ocala, Chattahoochee and Alum Bluff formations. A sand-clay mantle covers most of the county and may be used for road material.
 Residual clays from both the Ocala and the Chattahoochee limestones occur locally, but none of these are desirable for use in burned products.
 Sandy clays occur commonly in the central and eastern parts of the county. Some of these may be used for a poor grade of common brick. A red-mottled clay, occurring one mile north of Live Oak on the property of W. H. Lyle, was tested by the Bureau of Standards in 1914,1 and has the following physical properties:

 Physical Properties of W. H. Lyle Clay (Bureau of Standards, Sample No. 6).
 Plasticity.......................... Good.
 Water of plasticity................. 40.5%
 Linear air shrinkage............... .11.79%
 Fire tests:
Temperature. Linear Shr. Porosity. Color.
 Per Cent. Per Cent.
 9500C. 2.39 33.27 Light red.
 1010 31.45 Light red.
 1040 29.00 Light red.
 1070 24.70 Light red.
 100 5.68 24.37 Dark red.
 1130 24.65 Dark red.
 1160 23.85 Dark red.
 1190 24.70 Dark red.
 1220 5.89 24.67 Dark red.
 1250 24.53 Dark red.
 1280 23.96 Dark red.
 1310 5.62 24.65 Dark red.
 TAYLOR COUNTY
 Taylor County lies in north Florida and borders on the Gulf of Mexico. It is underlain chiefly by the Chattahoochee formation. Some

 lSellards, E. H., Report on Tests for Paving Brick, Florida Geol. Survey Press Bulletin No. 7, 1915.