A PRELIMINARY REPORT ON CLAYS OF FLORIDA 201 A similar clay occurring on the property of J. J. Goss, near Riverdale, has the following physical properties: Physical Properties of J. J. Goss Clay, Riverdale (Lab. No. o-77). Plasticity, judged by feel........... Excellent. W ater of plasticity................. 21.15% Pore water ........................ 0.40% Shrinkage water .................. 20.75% Linear air shrinkage............... 6.5 % Volume fire shrinkage.............. 16.1 % Modulus of rupture, average........ 211.9 pounds per square inch. Slaking test ....................... -10 m inutes. Fire tests: Temperature. Linear Shr. Absorption. Porosity. Color. Per Cent. Per Cent. Per Cent. 950*C. 1.0 28.98 38.90 Brick red. 1050 1.5 27.72 35.50 Brick red. 1150 2.5 20.48 29.20 Brick red. 1190 2.5 19.30 27.60 Brick red. 1230 2.5 19.04 25.60 Brick red. ST. LUCIE COUNTY St. Lucie County is located just northeast of Lake Okeechobee and borders the Atlantic Ocean. It is underlain by mars and sands of Pleistocene age. No clays of importance are known. SANTA ROSA COUNTY Santa Rosa County is situated in west Florida just east of the Escambia River and extends from the Alabama boundary to the Gulf of Mexico. The surface formations are sands, marls and clays, ranging from Pleistocene to Recent in age. The Citronelle formation underlies portions of the western part of the county. The clays of Santa Rosa County have, in the past, been practically unworked. This lack of development is largely due to the absence of transportation facilities in those sections of the county where the clays of greatest promise occur. The Louisville and Nashville Railroad traverses the southern part of the county from east to west, and the Florida and Alabama Railroad extends from Milton northeastward into Alabama, but the clays most suitable for commercial uses lie in the northwestern part of the county. The Board of Trustees of the Allentown Consolidated School District, nine miles north of Milton, have followed a novel procedure to