Pensauken Formation — Local, Details. 143 



80 feet deep. This hypothesis does not seem to be strongly sup^ 

 ported by known facts. 



The composition of the gravels northeast of Englishtown 

 suggests (Knapp) that they were deposited after the Beacon 

 Hill (and after the Bridgeton if the latter ever was here) was 

 largely removed, when the Cretaceous beds contributed more to 

 the surface gravels than they did when the gravels northwest of 

 Englishtown were deposited. This would suggest that the gravels 

 northeast of Englishtown are somewhat younger than those to 

 the northwest. 



Knapp suggests that a plain sloping from 180 feet at Freehold 

 to 140 feet at Englishtown and I20> feet at Jamesburg, was 

 covered with Pensauken gravel, slightly to the southeast, and 

 heavily to the northwest. In later erosion, the higher southeast 

 region suffered most, and the gravels and most super-Cretaceous 

 beds were removed, while to the northwest the surface beds were 

 not so fully worn away. Later deposits northeast of English- 

 town contained more Cretaceous material than the beds farther 

 northwest, because the older gravels to the northwest were never 

 removed so completely. This w r ould make the gravels between 

 Freehold and Englishtown somewhat younger than those of 

 Gravel Hill. Analogous relations are found in the vicinity of 

 Xew Sharon and elsewhere. 



Northeast of Englishtown. — The possible Pensauken gravels 

 here range from no feet (Clayton's Hill) near Englishtown, 

 to nearly 200 feet near Wickatunk. To the west, the gravel 

 caps small hills, and is 6 to 8 feet thick. It is, on the whole, 

 poorly assorted, but with loam enough to make it fairly com- 

 pact. Its base is irregular. In the larger patches, it runs down 

 the spurs of the hills to levels below those of its base in the 

 hilltops. In some of it, good sized cobbles occur, as at Gordons 

 Corners, but they are not plentiful. The matrix of the gravel 

 contains some greensand (now brown). In a pit at about 170 

 feet, 3 miles west-northwest of Marlboro, the composition of 

 the gravel is as follows : 5 per cent, chert, 10 per cent, ironstone, 

 and 80 per cent, quartz, about 3 per cent, being of cobble size. 

 The sand with th? gravel is about half gjlauconite. Other 



