THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. 
130 
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 on page 117. 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 Jacksonville. 
Samples 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. 
Feet. 
Filled ground and sand. o - 15 
Sand with some clay . 15 - 33 
Sandy limestone, yellowish or light buff in color. 33 - 37 
Light colored clayey marl . 37 - 70 
Blue sticky clay with black phosphatic pebbles. 70 -100 
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 ft. 5 gallons per minute.100 -320 
Buff clay resembling fullers earth mixed as seen in the sam¬ 
ple with green sandy marl.320 -340 
Greenish and sandy clayey marl .340 -390 
Indurated sands or sandstones .....390 -396 
Greenish sandy marls .396 -415 
Light colored limestone ....415 -420 
Greenish calcareous sandy clay ...420 -434 
Dark colored hard sand rock . 434 "435 
Olive green calcareous sandy clay.. 435 " 4 o 5 
Light sandy marl .... 455 "455 V* 
Green sandy marl .455*/^-462 
Dark sandy clay ...462 -490 
Very hard dark or gray sand rock.490 -493 
Silicified and very hard shell rock with siliceous phosphatic 
pebbles. After passing through this rock the flow is 
increased to 112 gallons per minute, temperature 71 
degrees F... 493 "49^ 
Light colored nlarl ...49§ - 50 ° 
Hard rock .......*.500 -506 
Light gray sandy calcareous rock with black phosphatic 
pebbles 
506 -510 
