20 



PHYSIOGRAPHIC GEOLOGY. 



of the Green Mountains ; and still farther eastward, — east of the 

 Connecticut, — the range of the White Mountains. 



The general idea of this composite structure is shown in Figs. 11 to 



Fier. 17. 



16, where each series of lines represents a series of ridges in a com- 

 posite range. In Fig. 11 the series is simple and straight ; in 12 it is 

 still straight, but complex ; in 13 the parallel parts are so arranged as 

 still to make a nearly straight composite range; while in 14 and 15 the 

 succession forms a curve ; and in 16 there are transverse ridges in a 

 complex series. In ridges or ranges thus compounded, the component 

 parts may lie distinct, or they may so coalesce as not to be apparent. 



