174 



GEOLOGY 



Mountain of New Jersey and its continuation in Pennsylvania. 

 In common with other corresponding crests, it is a remnant of the 

 oldest recorded base-level (or peneplain) of the region. The great 



Bowufartes of 



tf/pa/acklan Momtain Belt. 



& as fern bou/zdart/ of 



Fig. 143. Showing certain peculiarities of Appalachian drainage. 1 

 Susquehanna; 2 = the Potomac; 3 = the James; 4 = the Roanol 

 5 = the Coosa; 6 = the Tennessee; 7 = the Kanawha; 8 = head 

 New River; 9 = head of the French Broad. 



gap in the mountain is the Delaware Water-Gap. Below tl 

 mountain crest there is another plain, developed in a subsequent 

 cycle of erosion, while the valley plain in the foreground represents 

 the work of a still later cycle. 



Many of the peculiarities of the drainage of the Appalachian 



