182 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
well, as determined by measurement, is sixteen feet above Lake George. The well on April 25, I9IO, as indicated by the pressure gauge, had a pressure of four and one quarter pounds, equivalent to a head of 9.8 feet above the surface or 25.8 feet above the level of the water in Lake George. The first flowing water was reported at the depth of 8o feet, at which depth hard rock was encountered.
BREVARD COUNTY.
LOCATION AND SURFACE FEATURES.
Brevard County lies mostly between the St. Johns River and thpAtlantic Ocean. It has a total length of 66 miles and including Merritt's Island, is about 25 miles wide. It joins Volusia County on the north and St. Lucie County on the south. Aside from the linhe of sand dunes running parallel with the coast this county is prevailingly of the palmetto flatwoods type of country, although extensive prairie and muck lands occur in the interior of the county. Lake Washington in the central part of this county has an el iation of 15.74 feet while Lake Wilmington, the head waters f LWe St. Johns River in St. Lucie County, has an elevation of 23.37 k,-et above mean sea level at Indian River Inlet.*
WATER-BEARING FORMATIONS.
The deep wells in Brevard County enter the Vicksburg Limestone. At Melbourne this limestone, as indicated by well samples kept from the well of Mr. Oliver Gibbs, was reached at the depth of 221 feet. At Cocoa in the well of Mr. H. Bradford, the Vicksbirg" Limestone was recognized at a depth not exceeding 190 feet.
AREA OF ARTESIAN FLOW IN BREVARD COUNTY.
Although the interior of this county is but thinly settled and but few wells have been put down, it is probable that-the greater part of this county lies within the area of artesian flow. On the high sand dune ridge which lies out three or four miles from the coast a 1iow is not to be expected. This is probably also true of points within the interior of the county, particularly in the southwestern pani.
*Survey made in 1903, under the direction of Captain F. R. Shunk, U. b. Army.