Cape May Formation — Local Details. 169 



the vicinity of New Sharon, there is some wind-blown, sand, 

 perhaps comparable to that along some of the creeks farther 

 south (as Crosswicks and Doctors). Where eolian sand mantles 

 both the Cape May and the Pensauken formations, it obscures 

 the distinction between them, where exposures are absent. 



The sand-loam over the uplands here is conspicuous in some 

 places, especially between Assanpink Creek and Miry Run. 

 Where it is well developed, there is, in numerous places, an un- 

 dulatory topography, including' some undrained depressions. 

 This is most common about the heads of the minor tributaries. 

 The loam here is of the same general type as that at many other 

 places in the vicinity. It ' is perhaps most obvious and best 

 differentiated from its base where the underlying formation is 

 red shale, as at Wilburtha and Washington^ Crossing on the 

 Delaware, or along the valley of Shabacunk Creek, between 

 Trenton and Lawrenceville. The same type of loam recurs on 

 the east side of the Millstone in the vicinity of East Millstone, 

 Griggstown, Kingston, and in the vicinity of Penns Neck. The 

 loam is, on the whole, quite unlike that along the lower Delaware< 

 and its tributaries. That along Assanpink Creek and the Dela- 

 ware above, is finer and more uniform than the silts and sands 

 of eolian origin farther south, and contains much less material 

 which looks as if derived from the glacial valley train. On the 

 other hand, the loam above the level of the Trenton gravel is 

 not unlike the loam which covers the Trenton, gravels and sands. 



Bear Swamp. — In Bear Swamp, material of fluvio-glacial 

 origin is less conspicuous than in other near-by areas at the 

 same level. It is present, however, and material of similar 

 origin has been recognized in a sand pit three-fourths of a mile 

 southwest of Princeton Junction. These facts, taken in con- 

 nection with other phenomena of the region, indicate that glacial 

 waters flowed on all sides of the Penns Neck tract, which rises 

 above the Cape May level. The materials in the Bear Swamp 

 valley are finer than those in the valley of Stony Brook to the 

 north, suggesting that the main drainage was through what is 

 now Stony Brook valley. With Stony Brook valley filled to 

 60 feet with glacial gravel from the north, Millstone River would 



