WATER SUPPLY OP EASTERN AND SOUTHERN FLORIDA. 215 
the palmetto flatwoods type. The surface elevation in this county 
varies from about 20 feet above the sea in the northern part of 
the county to elevations of from 100 to 150 feet at points in the 
interior. 
WATER-BEARING FORMATIONS. 
The deep wells in Orange County terminate in the Vicksburg 
Limestone. At Sanford, in the northern part of the county, this 
formation lies comparatively near the surface, being reached at 
a depth of from 113 to 125 feet. Owing to the lack of a com¬ 
plete set of well samples the depth at which the formation is to 
be expected in other parts of the county has not been accurately 
determined. The formations lying above the Vicksburg have 
not been fully differentiated. It is probable that the Miocene 
occurs over the county, as the surface exposure of this formation 
has been recognized at Rock Springs, in the northwestern part 
of the county.* 
AREA OF ARTESIAN FLOW OF ORANGE COUNTY. 
The flowing area of Orange County is confined to a narrow 
strip bordering the St. Johns River. At Sanford this strip has 
a width of from three to five miles. Passing inland these low 
lands quickly give place to the more elevated, rolling lands of 
the lake region. With the exception of a few wells immediately 
bordering some of the lakes, flowing wells in this upland section 
have not been obtained. The flowing area in this county is out¬ 
lined on the accompanying map. 
LOCAL DETAILS. 
CHU-LUOTA. 
A two-inch flowing well three miles east of Chuluota is owned 
by Mr. G. M. Jacobs. The well is 114 feet deep, is cased 75 feet, 
*Smith, E. A., On the Geology of Florida. Amer. Journ. Sei. (3) XXI, 
292-309, 1881. 
