190 FLORIDA GEOLOGICAL SURVEY--THIRD ANNUAL REPORT.
miles south of Rockledge, is used for this purpose. The well has a reported depth of 480 feet. A gauge on the well indicated a pressure of I2/4 pounds, March 1O, 191o, or a head- of 28.8 feet above this point. The gauge was estimated to be ten feet above the level of the water in the river, thus giving the well a total head of 38.8 feet above the river level. The water contains a trace of salt as is common to the wells in this vicinity.
The well of Mr. H. S. Williams is of particular interest in that it is the only well in this vicinity of which a log has been obtained. It was drilled about 189o and is 304 feet deep. It is three inches in diameter and is cased 130 feet. The following is a log of this well as reported by Mr. Williams:
Feet.
Sand and soil' ....................................o -I
Coquina rock ......................................... 0 30
Sand............ ......... .. ................. 30 -100
Sand rock .............................................Ioo -I40
Blue clay....................................140 170
Hard flint rock. At this depth water rose to the surface,
small stream..170 -173
Rock in layer from 3 to 18 inches thick...............173 -269
H ard rock ............................................. 269 -273
Soft rock ...........273 -278 2-3
Hard rock, good flow of water ........................ 278 2-3-304 2-3
The first flow in the well as will be seen by consulting the log, was obtained from a depth of 170-173 feet. At this depth 3 feet of hard flint rock was encountered and on penetrating, this stratum the first water-bearing formation was reached.
SHARPES.
Several flowing wells occur in and near Sharpes. The water
here contains salt to such an extent that it cannot be used for irrigation. The well of J. W. Spafford furnished the following record. The well is four inches in diameter and 200 feet deep. It is reported cased only about 40 feet, and to have a head of IO feet above the surface. The first flow was encountered at 70 feet an,, it is reported by the driller, Capt. W. H1. Sharpes, that :neither the head nor the volume increased with the depth. As indicated from the well records and from all obtainable information, only a small amount of casing was used in the wells in this vicinity and a knowledge as to whether or not fresh water was encountered below the stratum of salt water is therefore lacking.