Pensauken Formation — -Local Details. 141 



appropriate for the Bridgeton formation, and appear to be 

 stream deposits, left in the general degradation of the region 

 from a higher level. They decline to the west and northwest, 

 in harmony with the present drainage, whereas the Bridgeton 

 of the region is not definitely related to the present drainage, and 

 its base declines to the southeast. Some of these gravels seem to 

 be correlated clearly with the Pensauken to the northwest, while 

 others may be somewhat young"er. Indeed, it does not seem 

 practicable to determine their age with certainty. On the whole, 

 it seems reasonable to regard them as contemporaneous, at least 

 in a general way, with the Pensauken at Jamesburg, and to have 

 resulted from the effects of the deposition about Jamesburg-:-, on 

 the drainage of the area here under consideration. 



On the south side of Wemrock Brook, between Englishtown 

 and Freehold, several patches of gravel occur at elevations wangl- 

 ing from 160 feet at the east to 120- feet at the west, on hilltops 

 and divides. The gravel caps are not known to be thick, but the 

 depth of material is rarely exposed. All these gravel remnants 

 lie on a surface some 50 feet below the divide between the 

 Matchaponix and Manasquan systems, on what may be regarded 

 as remnants of a surface which once sloped gently northwestward. 



The original Beacon Hill level for this region should have been 

 350 to 400 feet, so that the Freehold region has been degraded 

 some 200 feet since that time. The gravels along Wemrock 

 Brook were probably derived from the Beacon Hill formation, 

 and left along old stream courses. They are too low for the 

 Bridgeton, and since they agree in level with the Pensauken not 

 far away, they are referred to that formation. 



On the divide between Wemrock Brook and the south branch 

 of Tepeheptus Brook, there are other patches of gravel similarly 

 situated. One patch occupies a part of the Monmouth Battle- 

 ground, where 12 to 15 feet of glauconitic sand and loam over- 

 lie 1 to 3 feet of gravel, concealing it in most places. Farther 

 west there are isolated hills at slightly lower levels, capped with 

 gravel. The altitude of these patches ranges from 180 feet near 

 Freehold, to 120 feet in the vicinity of Taylors Mill, a mile east 

 of Englishtown. 



