WATER SUPPLY OP PASTERN AND SOUTHERN FLORIDA. 177 
the same well supplied a flow of two million gallons per day. 
The material penetrated in the drilling at Jacksonville, for a 
depth of about 500 feet, consists largely of clays, sandy clays, 
and sands with some fossiliferdus limestone and some shell de¬ 
posits. From about 500 to 524 feet the record shows considerable 
dense hard rock. After penetrating this stratum the limestones 
of the Vicksburg group are reached. 
The water supply for the city of Jacksonville is obtained from 
artesian wells. At present ten artesian wells are in use. Details 
as to the depth and construction of these wells will be found in 
the table of well records Nos. 1 to 10. The log of well No. 6 
was given in the Second Annual Report, p. 109. The samples 
from which this log was made were obtained by Superintendent 
Ellis by first drilling an eight-inch well, and afterwards reaming 
it out to a ten-inch well. 
The following is the record of the new city well at Jackson¬ 
ville. Sample of drillings from this well, together with notes on 
the materials penetrated, were kindly kept by Mr. S. L. Hughes 
of the Hughes Specialty Well Drilling Company, of Charleston, 
South Carolina: 
Filled ground and sand . 0 
Sand with some clay.... 15 
Sandy limestone, yellowish or light buff in color. 33 
Light colored clay marl . 37 
Blue sticky clay with black phosphatic pebbles. 70 
Marls, usually green or olive green in color containing 
variable amount of sand, and clay. Black phosphatic 
pebbles together with some shell fragments occur 
throughout the marl. Occasional thin layers of 
light colored limestone are reported within this 
interval. First flow of water at 270 feet 5 gallons 
per minute . 100 
Buff clay resembling fuller’s earth mixed as seen in the 
sample, with green sandy marl.. 320 
Greenish and sandy clayey marl.. 340 
Indurated sands or sandstones . 390 
Greenish sandy marls ...». 396 
Light colored limestone . 415 
Greenish calcareous sandy clay. 420 
Dark colored hard sand rock . 434 
- 15 
- 33 
- 37 
- 70 
-100 
-320 
-340 
-390 
-396 
-415 
-420 
-434 
-435 
