﻿198 
  

  

  H. 
  E. 
  Gregory 
  — 
  Geologic 
  Sketch 
  of 
  

  

  The 
  coast 
  shows 
  everywhere 
  signs 
  of 
  vigorous 
  erosion 
  ; 
  head- 
  

   lands 
  of 
  bare 
  rock, 
  rising 
  100-300 
  feet 
  above 
  water, 
  are 
  nurner- 
  

  

  Fig. 
  4. 
  

  

  Fig. 
  4. 
  General 
  view 
  of 
  the 
  Peruvian 
  shore 
  of 
  Lake 
  Titicaca. 
  

  

  Fig. 
  5. 
  

  

  Fig. 
  5. 
  Bay 
  of 
  Challa, 
  Titicaca 
  Island, 
  showing 
  beach 
  and 
  quality 
  of 
  hill 
  slopes. 
  

  

  