124 Quaternary Formations of Southern New Jersey. 



Bear Brook has cut through the Pensauken, and exposes the 

 Cretaceous formations in its channel, thus separating the Pen- 

 sauken area northeast of this valley from that between it and 

 Assanpink Creek. Above the headwaters of Bear Brook, how- 

 ever, the Pensauken cover is uninterrupted, and is continuous 

 between Hightstown, Aliens Station, and Windsor. South by 

 east of Hightstown, small areas of Pensauken have been isolated 

 by the valleys of the Millstone River and its tributaries. 



Southeast of Hightstown the Pensauken is limited rather 

 abruptly by the rise of the Cretaceous surface up to levels above 

 that reached by the Pensauken. The prompt rise of the Cre- 

 taceous surface here probably corresponds to the scarp farther 

 southwest, through Swedesboro, Woodbury, Haddonfield, 

 Moorestown, Jacksonville and Allentown. 



Between Assanpink Creek and Millstone River good exposures 

 of the Pensauken are less common than in areas where the rem- 

 nants are more isolated. About Dutch Neck, for example, ex- 

 posures are few. The surface shows a few cobbles and an 

 occasional bowlder, one over 4 feet in diameter. Such data as 

 are available indicate a thickness of less than 20 feet for the 

 formation in this region. Its general relations in this region are 

 shown in Fig. 51 (p. 136). 



Near Edinburgh the surface of the Pensauken is affected by 

 undulations like those already noted at a few points to the west, 

 and more conspicuously at a few points to the northeast, as about 

 Fresh Ponds, Dunhams Corners, etc. On the slope to the Assan- 

 pink, ij4 miles northeast of Edinburgh, the surface gives the 

 effect of having low ridges 4 to 8 feet high, much tangled, with 

 undrained depressions between. The open question is whether 

 the ridges are constructional, or whether the substratum, by 

 unequal sinking, moving, etc., has given rise to the undulating 

 surface. One of these curious areas occurs three-fourths of a 

 mile east of north of Edinburgh on the road to Dutch Neck, and 

 similar topography occurs a mile or more west northwest of 

 Locust Corner. 



A section of the Pensauken north of Locust Corner in the 

 south bank of the Millstone shows : 



