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 formation 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 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 outlined on the accompanying map (p. 167).
LOCAL DETAILS
CHIJLUOTA.
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 eipht feet ab(ve the surface. Thie w'vcr used for stock.
GENEVA.
There are several non-flowing wells in Geneva, the elevation being 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.