168 FLORIDA GEOLOGICAL SURVEY—THIRD ANNUAL REPORT. 
WATER-BEARING FORMATIONS. 
The deep wells in Orange County terminate in the Vicksburg 
Limestone. At Sanford in the northern part of the county this for¬ 
mation lies comparatively near the surface, being reached at a depth 
of from 113 to 125 feet. Owing to the lack of a complete 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 dif¬ 
ferentiated. 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 outlined on the ac¬ 
companying map (p. 167). 
LOCAL DETAILS 
CHULUOTA. 
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, 
and has a head of. eight feet abcve the surface. The waur T used 
for stock. 
GENEVA. 
There are several non-flowing wells in Geneva, the elevation be¬ 
ing too great for a flowing well to be obtained. Mr. H. H. Patti- 
shall has a two-inch well 133 feet deep, and cased 85 feet. This 
well was drilled by the Geo. H. Fernald Company in 1909. The 
water is said to rise to within 29 feet of the surface. 
Mr. J. T. McLain owns a well one and one-half miles north of 
Geneva. This is a two-inch well and is 135 feet deep. The water 
is reported to rise to within 31 feet of the surface. The water from 
*Smith, E. A., On the Geology of Florida- Amer. Journ. Sci. (3) XXI, 
292-309, 1881. 
