120 Quaternary Formations of Southern New Jersey. 



2) 2 feet of slightly gravelly loam. 

 O zV-2. feet of indistinctly stratified gravel and sand. Some layers 

 have much loam as a matrix for coarse sand, others are 

 chiefly of loam or marly loam; glauconitic. 



The stony material is made up of quartz, chert, and ironstone. 

 Other sections near vary but little from the above. Other 

 patches of gravel regarded as Pensauken occur at Cream Ridge 

 (150+ feet) and east of Imlaystown, at about the same elevation. 



Near New Sharon there are two patches of Pensauken. That 

 east of the railway is mostly non-arkose, that west of the railway 

 arkose. Their bases are at about 90 feet, and their surfaces run 

 up to about 130 feet. 



Trenton and vicinity. — A mile or less east of that part of 

 Trenton known as Chambersburg, and also 4 and 5 miles north- 

 east of Trenton, there are small areas of Pensauken rising up 

 through the Cape May formation. The tops of these areas, one 

 of which is in the Fair Grounds, are above 60 feet, the upper 

 level of the Cape May, represented here by late glacial gravels 

 and sand. Pensauken underlies considerable parts of the Cape 

 May formation about Trenton, running down to levels as low 

 as 20 feet, and probably down to 10 feet (Fig. 33, p. 54). 



North, northeast, and northwest of Trenton, there are 

 numerous areas of Pensauken resting on the Newark series. 

 They cover much of the area below an elevation of 120 feet, in 

 the area roughly outlined by Trenton, Asylum Station, Lawrence- 

 ville, and Princesville. The northwestern border of the Pen- 

 sauken here is well denned, just as its western border is at Phila- 

 delphia, where the edge of the formation is on gneiss and schist. 



The base of the formation in these areas is 80 to 90 feet above 

 sea level at the south (in the north part of Trenton), and rises 

 to 120 to 130 feet to the north and northeast. Its remnants in 

 this vicinity, considered in connection with those to the south- 

 east, show the existence of a pre-Pensauken valley in the general 

 position of Assanpink Creek, at or near the southeast border of 

 the outcrop of the Newark series. This valley was as low as the 

 present 20-foot level at Trenton (possibly lower), and probably 

 below 30 feet at Bakers Basin, 6 miles northeast of Trenton. 



