CLAYS OF CRETACEOUS FORMATION. 203 



CAMDEN AND SOUTHWARD. 



At Fish House, north of Camden, white clay belonging to 

 the Raritan formation has been found under the black Pensauken 

 clay (p. 133). Beds of similar clay are exposed intercalated in 

 sands along the ravines south of Fish House (135, 136), but the 

 clay layers are apparently not thick. So, too*, thin beds of sandy 

 clay were noted along the banks of a small stream north of Dudley 

 station at East Camden, but the Raritan formation in this vicinity 

 is chiefly sand. Raritan clay is also reported to occur on the 

 United States government land at Red Bank, below Gloucester; 

 on property of B. A. Lodge, near Billingsport, and of James 

 Kirby, near Raccoon creek, a mile south of Bridgeport. 1 At none 

 of these localities is the clay dug at present. From Bridgeport 

 southwestward the country is low and flat. The Raritan forma- 

 tion is nearly everywhere covered by the later Cape May sand 

 and gravel, and, although there is no reason to 1 doubt the existence 

 of clay beds at various horizons beneath this later cover, yet their 

 exact location, as well as their nature are unknown. 



From this brief summary it is evident that the Raritan forma- 

 tion, outside of the Woodbridge-South River area of Middlesex 

 county, is not a great clay producer. Although clay is dug in a 

 few localities, as at Dogtown (near Trenton), at Kinkora, and on 

 Pensauken creek, the formation, as a whole, is not so important 

 as some of the higher members. This is in part due to the fact 

 that from Trenton southwestward the channel of the Delaware 

 river covers a considerable portion of the formation, and in part 

 to the fact that across the central part of the State, as well as 

 farther southwest, the later Pleistocene sands and gravels are 

 quite thick and so conceal the clay. But it is also true that in this 

 part of the State the formation, so far as we know it, contains 

 more sand and gravel and less clay than farther northeast, and 

 that the clay beds are more local and discontinuous. 



1 Cook & Smock, loc. cit. pp. 251, 252. 



