﻿H. 
  E. 
  Gregory 
  — 
  La 
  Paz 
  (Bolivia) 
  Gorge. 
  147 
  

  

  to 
  these 
  beds 
  a 
  thickness 
  exceeding 
  2000 
  feet. 
  The 
  band 
  of 
  

   " 
  traelrytic 
  tuff 
  " 
  " 
  300 
  feet 
  beW 
  the 
  surface 
  of 
  the 
  plain," 
  

  

  Fig. 
  6. 
  

  

  

  ._*vKi-cEf!'.-;r*.VE 
  

  

  

  — 
  ■°.."S-?f:~^%'>°- 
  :r 
  ~' 
  

  

  *V^--v-^»' 
  

  

  - 
  --- 
  = 
  »° 
  ' 
  a 
  -iS,VSVi- 
  

  

  :.v.r-i«Ki'."ilBi=--: 
  

  

  rVi.^ws-^%-* 
  . 
  VStr^sr-^^- 
  

  

  

  ..-■„-=S^," 
  i 
  s^,=;**.— 
  • 
  

  

  -"'■r-' 
  : 
  ':'... 
  ■:,.;:... 
  :-■:. 
  

  

  a, 
  15 
  ft., 
  fine 
  sand 
  with 
  thin 
  lenses 
  of 
  gravel. 
  &, 
  4 
  ft., 
  cross-bedded 
  gravel, 
  c, 
  24 
  ft., 
  

   fine 
  sand, 
  consolidated 
  in 
  places 
  and 
  lenses 
  of 
  gravel, 
  d, 
  14 
  ft., 
  cross-bedded 
  gravel, 
  

   with 
  lenses 
  of 
  fine 
  sand. 
  e. 
  20 
  ft., 
  fine 
  sand, 
  f, 
  8ft., 
  cross-bedded 
  gravel 
  with 
  lenses 
  

   of 
  fine 
  sand, 
  g, 
  200 
  ft., 
  thin-bedded 
  sands 
  with 
  gravel 
  lenses 
  ; 
  portions 
  of 
  sand 
  firmlj' 
  

   cemented. 
  

  

  Fig. 
  6. 
  Section 
  of 
  a 
  portion 
  of 
  the 
  west 
  wall 
  of 
  the 
  La 
  Paz 
  gorge. 
  Drawn 
  

   to 
  scale. 
  

  

  