DARTON. ] 
NEW JERSEY. 
99 
3. In the Raritan beds. 
4. At the base of the Raritan formation. 
Basal Raritan. — The water horizon at the base of the Raritan forma- 
tion is in the coarse sands, gravels, etc., which lie on the east- sloping 
floor of crystalline rocks. These coarse materials appear to be a gen- 
eral feature over wide areas, and they are always water bearing. In 
some areas clays, either pure or including sand and gravel in an imper- 
vious matrix, lie directly on the crystalline rocks, but this feature is 
probably local. It is to be expected that to the eastward, out under 
central- southern New Jersey, the Raritan basal sediments gradually 
become finer grained and finally become too impervious to carry water 
supplies, but they are known to be coarse and to contain water over a 
wide belt parallel to the Delaware River and a line from Trenton to 
New Brunswick and Woodbridge. The area of this belt is indicated 
by a distinctive pattern in PI. I, on which wells to the basal Raritan 
beds have the letters BR in red after the figures indicating the depth 
in feet. 
The horizon is reached by the following wells at the depths indicated : 
Locality. 
Camden, Esterbrook well 
Camden, Cooper Hospital 
Camden, pumping station 
Pavonia 
Stockton, deeper wells 
Gloucester, deeper wells 
Woodstown 
Riverton (horizon doubtful) . . 
Maple Shade 
Riverside 
Trenton 
Hightstown 
Bordentown 
Burlington (horizon doubtful) 
Sayreville 
Perth Amboy 
South Amboy 
Monmouth Park 
Depth. 
Feet. 
87 
129 
90-98 
174 
125 
270 
776 
50 
375 
120 
160 
428 
195 
253 
80 
61 
105 
900 
Remarks. 
Pair supply. 
25,000 gallons per day. 
Not known. 
Large supply. 
500 gallons per minute. 
Fair supply. 
Satisfactory. 
10 gallons per minute. 
Plenty of water. 
No water. 
Not known. 
Satisfactory. 
Plenty of water. 
Not known; quality excellent. 
No water. 
Not known. 
No water. 
The many wells in the southern portion of the city of Philadelphia 
obtain a large supply of water from this horizon at depths averaging 
130 feet. The well at Moorestown, which ended at 457 feet in red clay 
and cobbles, with no water, was probably not far above the basal beds, 
and if it had been continued into them would no doubt have obtained 
a supply of water. The same is the case with the deep wells at Mount 
Holly, Jamesburg, and Columbus, and wells to more moderate depths 
at various points. The greater number of the welis obtained water 
from higher horizons, and there is, perhaps, no need for deepening them, 
but the Mount Holly and Jamesburg wells would have to be deepened 
to the basal beds of the Raritan formation to obtain water. The 
