THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA.

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 I17. The log of well No. 6 was
given in the Second Annual Report, p. lO9. 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 ................................... 0 15
Sand with som e 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 -00
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 ............ IOO -320
Buff clay resembling fullers earth mixed as seen in the sample 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 ....................... I .......... 415 -420
Greenish calcareous sandy clay ........................... 420 -434
Dark colored hard sand rock ............................. 434 -43.5
Olive green calcareous sandy clay .......................... 435 -4'
Light sandy marl .................................. 455 -4551/
Green sandy marl ................................ ........ 455 V -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* -498
Light colored marl .................................498 -500
H-ard rock ................................... ......500 -506
Light gray sandy calcarecus rock with black phosphatic
pebbles .............................. ............ 506 -510

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