Pensauken Formation — Local Details. hi 



There is a considerable area of Pensauken north of Three 

 Tuns, and a mile east of Kinkora. The material here is very- 

 similar to that at Bustleton. Bowlders 2 to 4 feet in diameter 

 are to be seen about the border of the area, and it is inferred 

 that they came from the base of the formation, appearing now 

 where the Pensauken has been removed. 



At Mansfield (Fig. 50) and northwest there is a large patch 

 of Pensauken whose base has an elevation ranging from no 

 feet at the east to 90 feet at the west. The height of the eastern 

 part here indicates that deposits reached up to the top of the 

 scarp, and perhaps overlapped it. The crystalline rock material 

 is confined to the lowermost 1 or 2 feet of the formation. 



Southeast of Mansfield Square is a hilltop (108 feet) cap of 

 the non-arkose phase of the formation. Its topographic position 

 leads to its correlation with the Pensauken. Other small patches 

 of gravel between Mansfield and Three Tuns have character- 

 istics similar to those of the larger areas. Such an area occurs 

 at Sharps Station, and another a mile to the northeast. 



A large area of Pensauken occurs east of Fieldsborough, but 

 exposures were poor when the region was seen. Enough was 

 seen to show that the patch contains much coarse material. The 

 remnant has a surface altitude of about ck> feet, and it is 10 to 

 20 feet thick. 



The area east of Bordentown occupies the divide between 

 Blacks Creek and Crosswicks Creek. The east part of the 

 formation here lies at the base of the old scarp, as at some of the 

 localities farther south. Arkose material rises to no feet at 

 least, and perhaps higher. Northern material is more common 

 in the lower than in the upper part of the section, but is not 

 restricted to the bottom. There is some cementation. In the 

 area as a whole there is, as at other points to the south, a dis- 

 tinct transition from mostly arkose at the west, to mostly non- 

 arkose at the east, at slightly higher levels. 



A mile west of Crosswicks, on the Bordentown road, a well 

 section seen was as follows : 



2) 4 feet gravel and loam. 



1) 20 feet coarse sand, with gravel and cobbles at base. 



