Bridgeton Formation^ — Local Details. 37 



Between Berlin and Atco. — The Bridgeton is present over a 

 considerable area between Berlin and Atco, and is well exposed 

 a mile northwest of the latter place. The material here is very 

 like that at Pitman Grove, except that the sand is less arkose. 

 Most of it appears to have been derived from the Cohansey 

 formation. 



ON THE DIVIDES BETWEEN BERLIN AND GLASSBORO. 



The main divide between the Delaware and the ocean, in pre- 

 Bridgeton time, appears to have extended from Daretown, via 

 Whig- Lane, Cross Keys and Mount Pleasant, to Berlin. North- 

 west of this main divide, the slope was steep and irregular ; to the 

 southeast it was gentler and less irregular. South of Berlin, the 

 Bridgeton formation seems to have overspread this divide, where 

 it was lower than to the north. Its failure to overspread it from 

 Berlin to Freehold and beyond was probably because the divide 

 was too high. 



Lower land northwest of the main divide at the time of 

 Bridgeton deposition is indicated by the decline in the base of 

 the Bridgeton formation northwest of the escarpment, and by 

 the numerous irregularities in its base in the vicinity of Green 

 Tree, Pitman Grove, Barnsboro, Jefferson, and Aldine. These 

 irregularities point to northwesterly drainage in pre-Bridgeton 

 time. The lower land northwest of the divide appears to have 

 been some 40 to 50 feet below the main divide. 



IN THE AREA OE SOUTHEASTERLY DRAINAGE. 



Southeast of the divide which limited streams flowing to the 

 Delaware, the drainage appears to have gone directly to the 

 ocean. The relations of the Bridgeton from Berlin to Glassboro 

 are shown in Fig. 25, which is somewhat diagrammatic.' It rep- 

 resents the Bridgeton as pinching out to the northeast, with the 

 rise of the base on which it rests. The upper limit of the Bridge- 

 ton material about Berlin seems to have been about 200 feet. 

 To the south and southwest, where the divide was lower, the 



