10 GEOLOGICAL SURVEY OF ALABAMA. 



TOPOGRAPHY. 



The topographic features of Murphree's Valley are in large 

 measure determined by the quality and altitude of the strata 

 out of which the valley has been excavated. It may, there- 

 fore, be well to introduce here a table showing the order of 

 succession of the geological formations concerned in the 

 structure of this part of the state, together with the thickness 

 of the several divisions, and the lithological characters of the 

 principal strata of each. 



Under appropriate heads below will follow further details 

 concerning these formations. 



