176 



GEOLOGY. 



southwesterly flowing streams worked its head back into the drainage 

 basin of the Appalachian River, and captured, one by one, the head- 



FiG. 168. — Shows the final change which resulted in the present course of the 

 Tennessee. The land is represented as somewhat higher than now.* 



waters of its westerly tributaries, establishing some such drainage 

 relations as are shown in Fig. 166. Still later, after the land area of 



iFigs. 165-168 are based on reports of Hayes, and Hayes and Campbell, already 

 referred to. Drawn by E. S. Bastin. 



