286 



GEOLOGY. 



ROCK 



LOAM 



Fig. 168. 



SLATE 



Fig. 169. 



races. In Fig. 168, at the right hand, is represented a 

 section of the bed of the Connecticut River, lying in the 

 alluvial loam. Here there are seven terraces of various 

 widths, the upper one having a considerable excavation 

 in it from the continued action of rain. In Fig. 169 is 

 represented a set of terraces at another locality on the 

 Connecticut, where the arrangement is somewhat differ- 

 ent. 



397. How Terraces were Formed. Terraces resulted 

 from the action of water on the modified drift as the land 

 was rising from its subsided condition in the Champlain 

 epoch. In other words, they were formed by the natu- 

 ral drainage of the country during that rise. Of course, 

 various circumstances had a play in their formation, giv- 

 ing them variety in their shape and arrangement. The 



