180 FtLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT


 Chemical Analysis of W. B. Stoutamire Clay, H. Ries, Analyst1.
 Silica (Si02) ............................................... 35.95
 A lum ina (Al203) ............................................. 13.23
 Ferric Oxide (Fe20s) ......................................... 1.27
 Lim e (CaO ) ................................................... 15.00
 M agnesia (M gO ) ............................................. 5.40
 W ater (H 20 ) ................................................ 10.55
 Carbon Dioxide (C02) .............. ......................... 18.50

 T otal ..................................................... 99.80
 Chemical Analysis of W. W. Williams Clay, H. Ries, Analyst2.
 Silica (SiO 2) ................................................. 30.83
 A lum nia (A1203) ............................................ 15.40
 Ferric Oxide (Fe203) ......................................... 1.40
 Lime (CaO) ................................................13.78
 Magnesia (MgO)............................................7.50
 W ater (1120) ................................................. 7.16
 Carbon Dioxide (C02) ........................................ 20.14

 T otal .................................................... 96.21


 LFVY 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 northern 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 simple taken in the street in front of the Williston School building has the following physical properties:

 Physical Properties of Williston School Clay (Lab. No. o-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.

 1U. S. Geol. Survey Prof. Paper No. 11, p. 82, 1903.
 2U. S. Geol. Survey Prof. Paper No. 11, p. 82, 1903.