102 
ARTESIAN WELLS ON THE ATLANTIC COAST. 
[BULL. 138. 
Locality. 
Depth to 
horizon. 
Remarks. 
Moorestown . 
Collingswood 
Maple Shade. 
Keyport 
Holmdel 
Mount Holly. 
Sea Girt 
Jamesburg . . 
Columbus 
Hightstown 
Rancocas . . . 
Flowing well. 
Water not reported. 
Considerable. 
"Water not reported. 
Do. 
No water. 
Satisfactory supply. 
No water. 
12 gallons per minute ; ferru- 
ginous water. 
Not known. 
These records indicate the general presence of this important water 
horizon over a wide area east and south of Camden, and that it appears 
to die out to the northeastward. In the Mount Holly, Jamesburg, and 
Columbus areas there are no signs of the coarse sands and gravel and 
no water was found in the wells, excepting a small amount of ferru- 
ginous water at Columbus. In Delaware and Maryland the Matawan 
formation is represented by the lower portion of the Severn formation, 
which is separated from the Karitan and Potomac beds by a general 
unconformity. It is suggested that this unconformity extends into 
New Jersey to beyond the latitude of Philadelphia and is marked 
by the presence of coarse deposits in the basal beds of the Mata- 
wan. According to Dr. W. B. Clark, no unconformity appears to 
exist in the area which he studied in Monmouth County, so in that 
region there probably are beds of passage from Matawan to Karitan 
formations. 
The known distribution and probable extension of the water-bearing 
beds at the base of the Matawan formation are represented on the 
map, PI. I, and in some measure also in the sections 2, 3, and 4 
of PI. III. The rate of dip to the east averages about 35 feet per 
mile east of Philadelphia, but there are some local variations of small 
amount. 
Beds in the Matawan formation (higher than basal beds). — A number 
of wells derive a moderately large amount of water from certain coarse 
beds some distance above the base of the Matawan formation. It is 
possible that the coarse beds are not at the same horizon throughout, 
and at present the evidence as to this is not complete. This horizon 
is about 160 to 200 feet below the top of the formation, varying slightly 
in different sections, and in the Asbury Park region, where the forma- 
tion thickens, there are several other horizons down to depths over 
1,100 feet. 
