120 
ARTESIAN WELLS ON THE ATLANTIC COAST. 
List of deep wells in Delaware— Continued. 
[bull. 138. 
Locality. 
Depth. 
Diam- 
eter. 
Capacity per 
minute. 
Height to 
which water 
rises. 
Remarks. 
Feet. 
90 
160 
150 
34 
400 
1,077 
200 
Inches. 
(?) 
4 
4 
4 
8 
6 
Gallons. 
(?) 
60 
60 
50 
15-18 
10 
75 
Feet. 
(?) 
+ 2 
+ 3 
Do 
Do 
In granite. 
In granite, 96-1,077 feet. 
In granite, 36-200 feet. 
Brewery). 
Wilmington (H. & F. 
Brewery). 
Wilmington (Hart & 
-25 
Bros.). 
DESCRIPTIVE NOTES ON WELLS IN DELAWARE. 
For the notes on the wells at Dover, Milford, Kitts Hummock, Mahon 
River, Lewes, and Clayton I am indebted to Mr. Lewis Woolman, of 
Philadelphia, 1 who has carefully studied the records and has correlated 
the waters with water horizons in New Jersey. The very important 
data for the wells at Middletown and Farnhurst were furnished by Mr. 
J. H. K. Shannahan, of Easton, the borer, and the information regard- 
ing' tbe wells in Wilmington was given by their owners. The general 
structural relations of all these wells are shown in section 1, PI. VI. 
Middletown, Newcastle County. — The well recently sunk at this place 
has proved to be a great success. Its depth is 535 feet and it furnishes 
240 gallons a minute. A somewhat larger amount was obtained on a 
special trial with a more powerful pump. The following partial record 
was furnished by the driller: 
Feet. 
0-76 sand with streaks of gravel and ironstone; water. 
76-96.... ..hard green clay with black, rounded sand grains in some beds. 
425-475 tough red clay. 
475-497 fine white sand yielding 40 gallons of water per minute. 
497-516 red clay. 
516-535 line sand filled with large supply of water. 
535-537 whi te clay. 
537-552 sand with large supply of water. 
552 pretty hard rock. 
The boring was begun on the middle marl bed, but as no record was 
saved of the beds from Do" to 425 feet, the well furnishes no new 
light on the thickness of the various members of the marl series. It is 
probable that the rock at 552 is " granite" or bed rock, as suggested in 
section 1, PI. VI, and if this is the case the waters are in basal sands 
of the Potomac formation . These sands are reported to have a thickness 
of 36 feet and to include a 2-foot bed of white clay near their middle, 
which divides the water into two horizons. 
I Report of geologist of New Jersey for 1891, p. 227; for 1893, pp. 401-404, 
