Bridgeton Formation — Local Details. 35 



of gravel occur at lower levels, ranging down even to 105 feet. 

 Some of them appear to be Bridgeton in situ, while others may 

 represent displaced remnants of the formation let down a little 

 from their original position. The most northwesterly remnant 

 is 1^2 miles south by southeast of Woodbury, capping a 

 144-foot hill (Reservoir Hill). There is a considerable plain at 

 about 100 feet surrounding" this hill, and on the plain there is 

 much gravel younger than the Bridgeton. The distinction of the 

 two formations, topographically, is brought out in Fig. 20. 

 Reservoir Hill corresponds with Adams Hill (Fig. 19) and Big 

 Mannington Hill farther southwest. The base o<f the Bridgeton 

 is lower about Creesville than elsewhere in the vicinity. 



At Point Pleasant (Camden County), the formation is found 

 up to levels of 191 feet, its base being 1 about 15 feet lower. At 

 Davidstown, Mechanicsville, and Irish Hill, it is at levels of 

 about 140 feet, the altitude of its base ranging from 120 to 

 135 feet. 



The distinctness of the Bridgeton and Pensauken is well shown 

 about Irish Hill (Fig. 22). About Bell Mawr, the arkose phase 

 of the Pensauken is restricted mainly to the 80-foot level. About 

 Irish Hill, at the ioo± level, there is Pensauken of the phase 

 which occurs at a distance from the Delaware. Irish Hill, which 

 has a Bridgeton cap, rises distinctly above these surroundings. 

 The Bridgeton here is essentially the same in constitution as that 

 about Point Pleasant, at elevations of 18CF-190 feet. It has all 

 the characteristic Bridgeton marks, namely, arkose sand, shale, 

 and bits of crystalline rock. 



AREAS ABOUT BERLIN AND EARTHER NORTH. 



Haddonileld. — About Berlin the Bridgeton caps the higher 

 hills, but to the west there is an area of about four square miles 

 where it forms a continuous cover. This area extends from 

 Albion on the south, to a point a mile east of Gibbsborough on 

 the north. The surface altitude ranges from 170 to 20O< feet, 

 and the base lies at elevations ranging from 1 150 to 200 feet. 

 West of this area is the escarpment overlooking the broad low- 



