Cape May Formation — Locae Details. 167 



the Assanpink to nearly 90 feet northeast of Newtown; (3) 

 along the upper Assanpink, rising from 60 feet near Lawrence 

 Station to 100 feet above New Sharon, 10 miles or so up stream; 



(4) along Bear Brook, rising from 60 feet near Princeton 

 Junction to 100 feet a mile and a half west of Hightstown; 



(5) along the Millstone above Princeton Junction, rising to 

 more than 100 feet above Red Tavern; and (6) along Cranbury 

 Brook, rising to no feet near its source. In all these six valleys 

 the materials of the formation were derived from the older for- 

 mations of the respective drainage basins. In composition, there- 

 fore, the Cape May formation of these valleys is essentially un- 

 like that at Trenton, in that it contains no glacial or other northern 

 material. In general the formation in the minor valleys is not 

 disposed in the form of distinct terraces, though it takes on a 

 terrace-like form here and there. Rather does it border the 

 streams, grading from the flood plains below to a fairly definite 

 level on the slope above, a level which rises up stream. The 

 upper limit of the formation at any point in the valley is not 

 sharp in all cases. Especially where exposures are poor, gravel 

 and sand brought down and deposited by the streams cannot be 

 sharply separated in all places from slope wash derived from the 

 Pensauken formation. 



The close association of the formation with the streams, its 

 rise up the valleys, and the fact that the materials were clearly 

 derived from the basins in which they occur, seem to leave no 

 doubt as to its fluvial origin. 



Chambersburg (Trenton) . — Sand and gravel pits in the vicinity 

 of that part of Trenton known as Chambersburg show a mingling 

 of glacial gravels and sand, with sand and gravel brought in from 

 the east and derived from Cretaceous and younger formations. 

 Glacial gravel and sand, and gravel and sand from the Miocene 

 about the headwaters of Doctors Creek, are readily recognized. 

 In some places the glacial gravels and those from the east are 

 intimately mingled. In other places they are so related as to 

 indicate that the amount coming in from the one source was 

 sometimes far greater than that coming in from the other. 



