^ 



rilYSiaVL GEOGEArilY. 



xxxvu 



expect that a Avell-markcd geological separation ^^ill tlien bo 

 found to exist between the fnoro recent volcanic formations 



of Avhich that 



and its southern 



composed, and the far older structuix^s and primitive up- 

 heavals characteristic of the true Rocky ^Mountain i>ystcm. 



tf 



# 



T* 





m0: 



|Hm 



