152 FLORIDA GEOLOGICAL SURVEY THIRD ANNUAL REPORT.
Feet.
Linestone........ .................................... 410- 4 0
Dense light brow n iimnestone. Temperature of water 7,_) a
520 feet. Head 42 feet above sea at 520 feet. Flow of 486o
gallons per minute at 520 feet ........................... 495-520
White "chalk," green clay, *dark porous limestone.............520- 557
Lim estone .................................................. 557- 675
H ard rock ................................................. 675- 685
Lim estone .................................................. 685- 770
Limestone, gray to light yellow ............................. 770- 96o
Thin stratum of hard limestone, followed by limestone similar
to above. Temperature of water 80 at iIO feet. Flow
of 6075 gallons per minute at iiio feet ................... 96o-Ii O
Hard rock, said to be standstone, with some flint...........1110 -1140
M aterial not recorded ......................................1140-1170
'Sandstone," followed by limestone. Temperature of water 8-0
at 1225 feet ............................................1170-1225
Limestone as above.................................... 1225-1278
"Sandstone." Sample not seen ............................... 1278_1293
Fossiliferous limestone ......................................1T293-1340
Fossiliferous limestone, easily penetrated. Temperature of
water 860 at 1340 feet ................................. 1340-1390
Denser lim estone ........................................... 1390-1440
The following is a log of the well of Mr. W. J. Sherman. This well was drilled by the owner in 1886 and is 210 feet deep. It is two inches in diameter and is cased I io feet. The head is reported to be 32 feet above sea and the flow about 8o gallons per minute.
Feet.
S and ............................................. ........ o 5
C lay .................................................... 5I 6
W hite quicksand ......................................... 6 ii
C lay .................................................... If II'2
Coairse pebbles and some shells ..........................I'- 43
Coarse gray to greenish sands, water-bearing; slight flow... 43 45 W hite plastic clay and fine sand ........................... 45 90
Greenish clay, very compact ...............................90 -42
H ard rock ................... ........................... 142 -143
Greenish clay with a mixture of black sand...............143 -172
Hard rock; water rises 32 to 37 feet above sea. ......172 -i8o White chalk rock (probably Vicksburg)..................8o -210
SWITZERLAND.
Switzerland is located in the area of artesian flow on the St. Johns River in the northwestern part of St. Johns County. WVells at ,this locality reach a depth of from 350 to 5oo feet, and the watei is reported to rise 29 to 30 feet above the surface.