38 Quaternary Formations of Southern New Jersey. 



Bridgeton was thicker (50 to 70 feet about Richwood, Whig 

 Lane, and Daretown). 



The character of the Bridgeton is well shown in numerous 

 exposures between Berlin and Glassboro. There is a large pit 

 at West Berlin (altitude 180 feet) which shows 7 or 8 feet of 

 coarse arkose sand with a little gravel, very compact, and avail- 

 able for road material. At the base of the section, crystalline 

 material and shale appear in a layer 6 inches to a foot in thick- 

 ness. Tumps of clay rounded into the form of pebbles appear 

 in the same layer. A mile north of West Berlin there is another 

 pit, at an elevation of 180 feet, which shows 10 feet of material 

 like that at West Berlin. The exposure in Houghton's Hill has 

 been referred to already. 



WEST OE COHANSEY CREEK. 



The Bridgeton formation is well developed on the divide west 

 of Cohansey Creek, from Aldine to the scarp a mile or so south 

 of Roadstown. It also covers the divides between the tribu- 

 taries to Cohansey Creek, extending nearly to tne main stream 

 southeast of Cohansey, east of Shiloh, and northwest of Bridge- 

 ton. It extends westward on the divide between the headwaters 

 of the tributaries of Stow Creek. Its base has an elevation of 

 about 100 feet at the north, and 90 feet at the south, and its 

 presence s nearly universal where the surface rises to the proper 

 level. Its surface has a maximum elevation of 149 feet a frac- 

 tion of a mile southeast of Cohansey. 



Fig. 26 is a section from Aldine south through Friesburg, 

 Cohansey, Harmony, and Shiloh, and shows the relations of the 

 Bridgeton west of Cohansey Creek. The section is along the 

 divide between the Cohansey and the Delaware drainage. The 

 surface of the formation declines a little to the southward, and 

 its base declines from 120 at Aldine to 80 or so at Shiloh, a 

 slope of about 3 feet to the mile. Its thickness here is greater 

 than in most other places, being as much as 30 feet in many 

 places. 



Fig. 26 represents the Bridgeton as terminating to the south, 

 just south of Bowentown, at an elevation of about 80 feet, along 



