THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA.

range from 143 to 200 feet. All of the wells of which record has been obtained are four inches in diameter. The length of casing used in the wells averages 6o feet.
Four wells drilled for J. H. Bahrenberg & Brother by N. H. Monck in December, 19o9, gave the following pressures. Well No. I is 143 feet deep and is cased 65 feet. The pressure of this well as shown by the pressure gauge December 4, I909, was 5y pounds. Well No. 2 is 16o feet deep and is cased 74 feet. The pressure December 4, 1909, was 5' pounds. Well No. 3 is 219 feet
deep and is cased 54 feet. The pressure of this well on the same day was five and one-quarter pounds. Well No. 4 is I6O eet
deep and is cased 58 feet. This well was not finished at the time the pressure of wells Nos. I, 2 and 3 was taken. As will be
seen from the above records the pressure in the case of these three wells diminished with depth. In this respect the wells are exceptional. The amount of flow of these three wells was not obtained. The following is the record of well No. 4 (made from the samiples kindly kept by the driller.
Feet.
Sand ........................................................ o 5
Olive green calcareous clay with black phosphatic pebbles and
fragments of shell and flattened water-worn gravels ......... 5- 40
N o sam ple ................................................... 40- 45
S'nmalr or somewhat more calcareous green clay or clayey marl.
This sample contains occasional fragments of chert.........45-80
This sample contains the black phosphatic water-worn pebbles in
greater number than the above sample. Clear quartz grains are numerous. Flattened water-worn siliceous pebbles up to
size I x %2 inches occur .................................. 8o-9o
In this sample clear quartz grains predominate. These are mixed
with gray sand grains. Calcareous gray sand nodules occur, water-worn chert gravels are present, also numerous large
water-worn chert fragments .............................. 90-113
N o sam ple ....................................................113-115
Loose clear-grained sand in mass appearing light gray and contains a small amount of calcareous matter in the form of
fragm ents of shell ........................................115-16o
PALATKA.
Palatka, the county seat of Putnam County, is located on the St. Johns River 55 miles south of Jacksonville. The elevation of the Atlantic Coast Line depot, as recorded by the U. S. Coast and Ceo

163