Pensauken Formation — Local Details. 93 



and gravel, came to be ridges, while the more easily eroded 

 materials on either hand was carried away. Up-stream, the 

 old valley deposits become less and less distinctive, and merge 

 into the valley deposits of more recent times. Here, as else- 

 where, the site of deposition in the valleys moved up-stream, as 

 the stream advanced in age. In the Pensauken epoch the streams 

 tributary to the Delaware were shorter than now. 



Two to three miles north o<f Alloway, near Riddleton, a sec- 

 tion at an elevation of about 80 feet shows 1 



3) 1-3 feet of clay loam. 



2) 4 " of stratified sand and clay. 



1) 2 "of gravelly clay. 



Miocene clay (at the base). 



Similar sections are repeated many times in the vicinity. The 

 pebbles are mostly quartz, chert, and sandstone, and their sur- 

 faces in many cases are coated with iron oxide, giving them a 

 rusty appearance. 



Another section seen about 3 miles northeast of Alloway 

 showed 



3) 3 feet of gravel, sand and loam", with cobbles, and even bowlders 



1 foot in diameter. 



2) 1 foot of conglomerate, cemented by iron oxide, 



1) 2 feet of sand. 



Miocene clay. 



Similar sections occur at various points in the region between 

 Alloway and Yorktown, at elevations of 60 to 90 feet, mostly 

 on the low divides. 



East of Welchville, in a hilltop at an elevation of 64 feet, the 

 section of material regarded as Pensauken is as follows : 



3) 2 feet of sandy loam. 



2) 2 feet of sandy gravel. 



1) 10 feet of sand, white, yellow, brown, with thin layers of black 

 grains. 



1 In all sections following, the lowest member is at the bottom, and is 

 numbered i). The second member from the bottom is numbered 2), and 

 so on. 



