180 
FLORIDA GEOLOGICAL SURVEY—I5TH ANNUAL REPORT 
Chemical Analysis of W. B. Stoutamire Clay, H. Ries, Analyst 1 . 
Silica (Si 02 ) . 35.95 
Alumina (AI 2 O 3 ) . 13.23 
Ferric Oxide (Fe 203 ) . 1.27 
Lime (CaO) ... .•. 15.00 
Magnesia (MgO) . 5.40 
Water (H 2 0) . 10.55 
Carbon Dioxide (CO 2 ) . 18.50 
Total 
99.80 
Chemical Analysis of IV. IV. Williams Clay, H. Ries, Analyst 2 . 
Silica (Si 02 ) . 30.83 
Alumnia (AI 2 O 3 ) 15.40 
Ferric Oxide (Fe 203 ) . 1.40 
Lime (CaO) . 13.78 
Magnesia (MgO) . 7.50 
Water (H 2 0) . 7.16 
Carbon Dioxide (CO 2 ) . 20.14 
Total 
96.21 
LEVY COUNTY 
Levy County borders the Gulf of Mexico in the northern part of the 
peninsula and is chiefly underlain by the Ocala formation, on which are 
a few outliers of the Alum Bluff and Alachua formations. Numerous 
lacustrine deposits, usually formed in sinks, are locally present. 
Residual clays from the Ocala limestone are common in the north¬ 
ern and eastern parts of the county. Some of these residual deposits are 
quite extensive in area and of fairly uniform thickness. 
One such deposit is found at Williston where the clay is somewhat 
sandy, is red-burning, and has excellent working qualities. It may be 
used for common structural materials, but a vitrified product cannot be 
produced as its porosity remains high at the higher temperatures. A 
sample taken in the street in front of the Williston School building has 
the following physical properties: 
Physical Properties of Williston School Clay (Lab. No. 0 - 9 ). 
Plasticity, judged by feel... Excellent. 
Water of plasticity. 31.20% 
Pore water . 1.69% 
Shrinkage water . 29.51% 
Linear air shrinkage. 12.60% 
Volume air shrinkage. 35.75% 
Modulus of rupture, average. 232.1 pounds per square inch. 
Slaking test. 2 minutes. 
iU. S. Geoh Survey Prof. Paper No. 11 , p. 82, 1903. 
2 U. S. Geol. Survey Prof. Paper No. 11 , p. 82, 1903. 
