DARTON-] 
NEW JERSEY. 
39 
SOUTHERN NEW JERSEY. 
GENERAL GEOLOGIC RELATIONS. 
The portion of the State of New Jersey that lies south and east of a 
line extending from Trenton to near New Brunswick is underlain by a 
succession of great sheets of sands, clays, marls, and gravels lying on 
a basement of rocks which are mainly granite and gneiss. These rocks 
outcrop in Pennsylvania, at Trenton, and on Staten Island, but their 
surface slopes gradually to the southeast beneath the overlying sedi- 
ments, and it is deeply buried along the ocean shore. The sheets of 
overlying sediments also dip to the southeast, but at a less rate, and 
consequently some of them thicken in that direction. In the sections 
on Plate III an idea is given of the structure of the region, although 
they do not show how deep the crystalline rocks finally sink. 
The formations of southern New Jersey have been studied by the 
State geological surveys, and during the past few years Dr. W. B. 
Clark, 1 of the United States Geological Survey, has added greatly to 
our knowledge of them. In the following table is a list of these forma- 
tions, with the names by which Dr. Clark has designated them, their 
thickness, and some other information, mainly from Dr. Clark's reports, 
but in part from the evidence of well records : 
Formations of southern New Jersey. 
Formations. 
Miocene : 
Chesapeake, sands and clays 
Cretaceous : ] 
Shark Kiver 2 . VOpper marl. . . 
Manasquan.J 
Kancocas, or Middle Marl . . 
Redbank, or red sand 
Navesink, or Lower Marl 
Matawan, or clay marls 
Raritan, sands and clays 
Crystalline rocks. 
Monmouth 
Junction and 
New Bruns- 
wick to 
Asbury Park 
and Long 
Branch. 
Feet. 
100 
12 
a 65 
20 
nlOO 
w45 
n275 
bn 420 
Philadelphia 
and Burling- 
ton to Beach 
Haven. 
Feet. 
800 f 
60 
e30 
e90 
e43 
c220 
d537 
Bridgeport 
and Salem to 
Atlantic 
City. 
Feet. 
1,000 + 
/m90 
fkl ml5 
iklmS2 
hkl m50 
q h 1 220 
a Fossil beds in Middle and Lower marls are 100 feet apart in wells at Ocean Grove and Asbury Park. 
6Jamesburg well. 
cMount Holly well. 
d Columbus well. 
el55 feet in Marlton well from lower beds of Middle Marl to base of Lower Marl ( ?). 
/Glassboro and Quinton wells. 
g Wenonah well ; 160 feet in Woodstown well. 
h Sewell well, 240 feet ( ?). 
T'Quinton well. 
k 100 feet in Greenwich well. 
7336 feet in Woodstown well. 
<m 235 feet in Glassboro well. 
n 860 feet in Monmouth Park well. 
•Report of the State Geologist for 1892, pp. 167-245, and Report of State Geologist 
for 1893, pp. 329-355. 
2 Eocene? 
