THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA. 
161 
Southern and Florida Railway, an elevation is reached of 150 feet. 
On the Rochelle branch of the Atlantic Coast Line Railroad an 
elevation of 105 feet occurs at Interlachen, in the central part of 
the county. That part of the county bordering the St. Johns River 
includes palmetto flatwoods and some open tiatwoods. Much of 
the southern and western part of the county is occupied by the lake 
region, many small beautiful lakes occurring in this section. 
WATER-BEARING FORMATIONS. 
The data regarding the formations reached by the wells in Put¬ 
nam County is very meager owing to the fact that few well samples 
have been preserved. 
After passing through the superficial sands in this county, cal¬ 
careous clay and sands are reached, in which are imbedded black 
phosphatic pebbles and water-worn gravels. From such imperfect 
information as has been obtained it seems probable that some o ? the 
wells terminate in this formation and do not reach the Vicksburg 
Limestone. The log of a well at Orange Mills, which terminated 
in loose clear-grained sand at a depth of 160 feet, is given on a 
subsequent page. A second well within a half-mile of this well 
apparently reached the Vicksburg Limestone at or about the depth 
of 160 feet. Samples from the well of B. F. Dotney, at San Mateo, 
drilled in 1909 by H. Mervin, show the presence of black phosphatic 
pebbles as deep at least as 175 or 180 feet. At a depth of 315 feet 
light-colored calcareous sands were penetrated. It is probable, as 
these wells seem to indicate, that the Vicksburg Limestone here as 
at some other localities has a very irregular top surface. 
AREA OF ARTESIAN FLOW IN PUTNAM COUNT'/ 
The flowing area of Putnam County includes a relatively nar¬ 
row strip bordering the St. Johns River and its tributaries. 
Upon leaving the river the elevation rises and flowing wells are 
not obtained. The flowing area in this county is indicated by 
shading on the map. (Fig. 13, p. 155). 
LOCAL DETAILS 
BOSTWICK. 
Flowing wells are obtained at Bostwick. A three-inch well 
drilled in 1904 for J. W. Glisson by H. Mervin reached a total depth 
of 248 feet. This well is reported cased 60 feet and the water is 
reported to rise 18 feet above the surface. 
