Bridgeton Formation' — Local Details. 47 



Harbor River. Others lie between South River and Stephens 

 Creek, and between the last and Tuckahoe River. 



On the divide east of Richland, between Deep Run and South 

 River, the Bridgeton is somewhat wide-spread at an elevation 

 ranging from about 100 feet at Richland, to about 60 at Emmel- 

 ville. In the same distance, the base of the formation declines 

 from 80-85 feet to 55-60. 



Exposures near Emmelville show 4 to 6 feet of gravel similar 

 to that at Williamstown, except that it is more commonly- 

 cemented by iron oxide. The material is, indeed, quarried as 

 much as dug. No shale or crystalline rock bits were seen here, 

 and the correlation of the material with the Bridgeton is not 

 made with great confidence. 



The divide between Richland and Mays Landing shows a few 

 exposures deep enough to be significant. The railway cuts show 

 but a thin remnant of the Bridgeton. What appears to be the 

 basal part of the formation is partly cemented to conglomerate 

 which is locally in place and locally broken and displaced. The 

 Cohansey appears to be but little below the surface. 



Between Buck Hill and Cross Keys, shale and bits of crystal- 

 line rock are not seen in many places, though exposures are not 

 rare in the vicinity of Russia, Richland, Newtonville, and Wil- 

 liamstown. These same materials are found on both sides of 

 the line of the section, as at Downer, Folsom, and Millville. 



If the section along the line of Fig. 29 be considered, the 

 altitude of the surface of the formation ranges from 177 feet 

 at Cross Keys, to 56 feet at Buck Hill. This represents a slope 

 of about 4 feet a mile for the upper surface along this line. The 

 base of the formation is more regular than the surface, but the 

 general slope is in the same direction and about the same in 

 amount. At Cross Keys, the base has an elevation of about 150 

 feet, and at Buck Hill of about 40 feet. The irregularities of 

 base are such as would be expected from deposition on a surface 

 of slight relief, developed by stream erosion. 



