. Annual report. Florida Geological Survey; Geology -- Florida. WATER SUPPLIES AND WELL RECORDS. 109 substructure is an important element in formulating the geologic history of the land area and hence has the same broad and general application as other geologic studies, having both an economic and educational value. As an instance of a well from which an approximately com- plete record has been obtained may be mentioned the City well at Jacksonville in Duval County drilled in 1910, the record in this case being supplied through the courtesy of the drillers, the Hughes Specialty Well Drilling C
. Annual report. Florida Geological Survey; Geology -- Florida. WATER SUPPLIES AND WELL RECORDS. 109 substructure is an important element in formulating the geologic history of the land area and hence has the same broad and general application as other geologic studies, having both an economic and educational value. As an instance of a well from which an approximately com- plete record has been obtained may be mentioned the City well at Jacksonville in Duval County drilled in 1910, the record in this case being supplied through the courtesy of the drillers, the Hughes Specialty Well Drilling Company. This well reached a total depth of 980 feet, and samples of the drillings were kept at occasional intervals, a total of 46 samples having been preserved. Fig. 26.—Well drilling machinery used in Florida. and submitted to the State Survey. The detailed log of the well based on an examination of the samples supplemented by the notes made by the driller has been published in the Fifth Annual Report of the Survey, and need not be repeated here. The prin- cipal water supply in this well is obtained from the Vicksburg limestone, a formation well known to the drillers as it is the chief water bearing formation of the peninsular section of the State. The first flow of water amounting to only about 5 gallons per minute was obtained in this well at a depth of 270 feet. At the depth of 493 feet the flow was increased to 112 gallons per minute,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Florida Geological Survey. Tallahassee, Fla. :
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