88 
ARTESIAN WELLS ON THE ATLANTIC COAST. 
[BULL. 138. 
Feet. 
217-232 clay. 
232-308 coarse sand. 
308-380 fine dark sand and water. 1 
The well at the electric-light works obtains water from the same 
beds. Its record has been reported as follows: 2 
Feet. 
0-6 beach sand. 
6-8 marsh clay. 
8-50 fine white sand, with one or two thin streaks of clay. 
50-60 coarse gravels, with cobbles, some as large as hens' eggs. 
60-250 whitish sand with a few clay streaks. 
250-256 dark-blue or drab clay. 
256-300 whitish sand, coarser than the other. 
300-350 bine clay. 
350-390 very fine quicksand, dark blue gray in color, with white shells. 
390-464 green or gray marl. 
The water horizons appear to be the same as the horizon at 328 feet 
at Ocean City and Atlantic City. 
Seven Islands, in Great Bay, Burlington County. — The well was bored 
on the eastern side of the most northerly of the islands by Joseph 
Wharton. It is 408 feet deep — 188 feet of 6-inch pipe, 147 feet of 
4J-inch pipe, and 69 feet of 3-inch pipe. The record is as follows : 
Feet. 
0-279 sand with salt water. 
279-284 tough clay. 
284-285 white pebbly sand. 
285-335 clay with seams of sand. 
335-380 dark-blue clay. 
380-395 sand and gravel. 
395-408 compact dark-brown clay. 
Sand and fresh, pure water. 
The water flows at the rate of 70 gallons a minute and rises to a 
height of 15 feet above the surrounding tide meadows. Analysis 
showed the water to contain only 6.88 grains of solid matter to the 
gallon. Its temperature was 60°. The analysis, by Austin and Wilbur, 
is as follows : 
Analysis of water from uwll at Seven Islands, N. J. 
Silica 
Sesquioxide of iron and alumina 
Lime 
Magnesia 
Soda 
Potash 
Sulphuric acid (SO 3 ) as sulphates 
Chlorine as chlorides 
Mineral matter 
1 New Jersey report for 1888, p. 77. 
2 New Jersey report for 1890, pp. 268, 269 
Grains per 
gallon. 
1.557 
.140 
.379 
.221 
.968 
.157 
.408 
.408 
4.238 
