150 FLORIDA GEOLOGICAL SURVEY-THIRD ANNUAL REPORT.
Feet.
Gray sand and shell, water, shark's tooth, also minute black
phosphatic pebbles .......................................112-133
Blue clayey marl .......................................133-135
NO sample ............................................135-153
Blue marl with inclusions of black phosphatic pebbles........153-174 Blue clayey limestone; water-bearing.II..............14-175
Dark green marl with some black phosphatic pebbles.........175-200
Very bard bluish colored rock, and water-worn small pebbles;
water commenced to flow upon penetrating this stratum .... 200-219
Limestone, Vicksburg as indicated by the presence of Nummulites ...........................................219-318
ROY.
Roy is located on the Florida East Coast Railway about 6 miles inland from the St. Johns River. One deep well is reported from this place. This is a four inch well drilled by Mr. S. I. Killingsworth for Mr. L. J. Campbell. The well has a total depth of 2Q8 feet and is cased I5o feet. The flow is reported to rise four feet above the surface.
ST. AUGUSTINE.
St. Augustine, the county seat of St. Johns County, is located on Matanzas Bay. An abundance of flowing water is obtained at this place. Probably not less than ioo wells occur in and near St. Augustine. Of this large number it is possible to mention only a few.
The first considerable flow in and near St. Augustine is obtained at a depth of from 17Q ,to 18o feet after drilling througyi a five to ten foot stratum of dense hard rock. The material penetrated before reaching this hard rock stratum consists largely o. sand near the surface, followed by blue clays with some shell and occasional thin layers of rock. A shell stratum often described as "coquina" occurs at a depth of about 6o feet.
The material below 'the depth of about i8o feet consists of alternating hard and soft strata largely limestones with probably occasional flints. The flow of water increases as the limestone is penetrated. The chief large increase of flow occurs at a depth ot about 520 feet and most of the wells at St. Augustine terminate at this depth.
Water for the city of St. Augustine is obtained from two artesian wells located about one mile north of the city. Well No. I was drilled in I897 by Mr. Hugh Partridge and had originally a (lepth of 371 feet. About 1903 this well was deepened to a to-