140 
FLORIDA GEOLOGICAL SURVEY—THIRD ANNUAL REPORT. 
Light colored fossiliferous limestone (Vicksburg). Upon 
reaching this formation the flow is increased to 200 
gallons per minute. At 625 to 635 feet the harder stratum 
was drilled through which flowed 500 gallons per minute, 
temperature 74 degrees F. At 680 feet the water pres¬ 
sure measured, as shown by the gauge, 12 pounds.510 
Limestone prevailing brownish in color, and as a rule harder 
than above. Occasional thin layers of marl and shell. 
Slight increase of flow at 780, water pressure at 900 feet 
15 pounds; flow about 900 gallons per minute; temper¬ 
ature 74 degrees F.. 1 .680 
Limestone similar in character to above but as a rule not 
so hard. Flow at 980 feet, 1,500 to 2,000 gallons per 
minute .900 
Feet. 
-680 
-900 
-980 
The Vicksburg - Limestone was reached in this well at a depth 
of about 510 feet. The first 170 feet of the Vicksburg is prevail¬ 
ingly light colored or white and fossiliferous. Below 680 feet 
the limestone is as a rule brownish in color, compact and harder 
in texture and not so fossiliferous. The amount of flow, the pres¬ 
sure and the temperature increased as the deeper la^^ers of the 
Vicksburg Limestone were penetrated. 
The formations lying above the Vicksburg Limestone can 
scarcely be differentiated. The Jacksonville formation, Miocene, is 
reached at the depth of 33 feet. At about 320 feet some clays re¬ 
sembling fullers earth were obtained. At from 415 to 420 feet 
light colored clayey limestones were encountered. With these ex^ 
ceptions the interval from 37 feet to 510 feet consists largely of an 
olive green sandy marl. 
An analysis of the water of the public supply at Jacksonville 
was made in 1898. Analyst, Albert Leeds, Stevens Institute of 
Technology. The analysis is as follows: 
Constituents. 
Grains per Parts per 
U. S. Gallon, million. 
Silica and insoluble matter . 0.729 
Alumina . 0.047 
Carbonate of lime .. 3.866 
Sulphate of lime .'.. 4.053 
Sulphate of magnesia . 2.927 
Sulphate of soda . 5.843 
Chlorides of soda ..4.811 
Free ammonia ....... 
Albuminoid ammonia .... 
12.497 
8.057 
66.274 
69.480 
50.177 
100.166 
82.474 
0.143 
0.0044 
