188 



extends, to within four n:iiles of Camden. Sweeping again 

 slightly to the south, the line reaches Timber creek, one mile and 

 a half from the river. Thence its direction is nearly west- 

 southwest as far as Raccoon creek, the line crossing in the 

 interval Woodbury creek near Woodbury, and Mantua creek 

 near Sandtown. Passing Raccoon creek about one mile below 

 Swedesboro, it deflects more to the south, and pursues a nearly 

 straight course to its point of termination near Salem, crossing 

 Oldman's creek at Sculltown, and Salem creek about two miles 

 west of Sharptown. 



The undulations of this northwestern boundary of the green- 

 sand appear to arise less from any variations in the amount of 

 the southeast dip, which is nowhere more than barely perceptible, 

 than from the inequalities in the denudation of the stratum along 

 its margin, and more especially from the irregular overlapping of 

 the diluvial covering, which, particularly in the eastern side of 

 Middlesex, conceals the true limit of the formation in all the 

 higher tracts of ground between the streams, and gives to the 

 visible boundary the curving outline alluded to. The denuding 

 flood, which has evidently swept along the valley of the Dela- 

 ware, seems, in curving to the south, to have cut away a large 

 portion of the greensand, which originally extended southwest 

 of Oldman's creek, giving to it a wedge-like form at its termi- 

 nation near Salem. The true strike or direction of the stratum 

 would carry its northwest margin to the Delaware somewhere 

 opposite Newcastle, as shown by the position of this side of the 

 formation, where it reappears in the State of Delaware, in the 

 vicinity of Bowersville. The oblique course of the denudation 

 across the belt is further manifested in the nearly north and south 

 direction of its margin on the western side of the river. In con- 

 sequence of this, the southwest point of the formation in New 

 Jersey lies opposite the general southeast margin in Delaware; 

 and the northwest termination of the tract in the latter State, is 

 in the prolongation of the general northwest edge already traced 

 across New Jersey as far as Oldman's creek. 



From the point where the northwest boundary of the green- 

 sand commences, the formation is exposed for a considerable 

 height along the base of the Nevesink Highlands, the whole 

 distance from Compton's creek to the mouth of the Nevesink 



