Pensauken Formation — Local Details. 151 



of no to 70 feet. Ironstone, the major constituent, is partly 

 from the Beacon Hill formation, and partly from the Cretaceous. 

 The gravel is poorly cemented and poorly stratified. Knapp 

 thinks this an accumulation of general fan type, at the bases of 

 the hills to the south. The material is coarser at the south, and 

 finer at the north, away from the hills. Along the west side of 

 the creek are many patches of gravel ranging in altitude from 

 120 feet up stream, to 60 feet farther down. These gravels and 

 sands are derived chiefly from Cretaceous beds up stream. They 

 have a thickness of 20 feet in places, and are disposed in rude 

 terraces. They represent former valley aggradation from an 

 altitude of 120 feet down to yo± feet. 



Similar deposits occur east of Waycake Creek, in positions 

 corresponding to those on the west. Little or no gravel is 

 exposed, and the material does not constitute terraces, as on the 

 west side of the stream. There are other similar gravels about 

 New Monmouth, at levels of 60 feet and less. 



There is a considerable bed of gravel at Hopping at an altitude 

 of 60 feet, with its base at 40 feet. The gravel thickens north- 

 ward and has a maximum depth of about 20 feet. It is well strati- 

 fied and assorted. It is not clear that the material about Hopping 

 is separable from the Cape May formation, but it does not form a 

 terrace and nearly bare Cretaceous lies between it and the coast. 

 Its topographic position seems to make it older than the Cape 

 May, and younger than Pensauken. 



There is much doubt as to the correlation of all these patches 

 of gravel and sand (Walnford of Knapp) as well as of isolated 

 patches which Knapp has classed as probably Cape May between 

 Keyport and Red Bank, and in the area to the north of this line. 



Between Hazlet and Keansburg, but nearer the latter place, 

 are several gravel-capped hills at an elevation of about 85 to 

 100 feet. Exposures of 7 feet of gravel are seen, with base 

 sloping northward. These patches are probably to be regarded 

 as Pensauken. On some of the hills the material is very coarse, 

 including bowlders a foot in diameter. Miocene (Kirkwood) 

 quartzite is recognized among them:. Some of the ironstone, too, 

 is in large pieces, and little rounded. 



