I. Bowman — Physiography of the Central Andes. 217 



surface of the plateau remains strikingly true to this level. 

 West of these localities and toward the coast the initial features 

 are complicated and rendered indistinguishable by great warps 

 and faults and by the masses of volcanic debris that appear 

 east of Arequipa. 



Fig. 12. 



Fig. 12. General view of the baseleveled and now uplifted and dissected 

 Maritime Andes, near Crucero Alto, Peru. Altitude about 14,300 feet. 



A study of the map will show the great extent of territory 

 involved in the explanation here suggested and will clear the 

 way for the study of the eastern plateau, whose physiography 

 will be found to have a similar interpretation. In the follow- 

 ing chapter will also be discussed certain features of the 

 physiography and geology of the Maritime Ancles, which are 

 best treated in connection with similar features in the eastern 

 Andes with which they are genetically related. 



(End of Part I.) 

 Geological Department, Yale University. 



