﻿146 
  

  

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

  

  The 
  texture 
  and 
  structure 
  of 
  a 
  portion 
  of 
  the 
  beds 
  taken 
  

   about 
  midway 
  between 
  the 
  top 
  and 
  bottom 
  are 
  shown 
  in 
  tig. 
  6. 
  

   Figs. 
  7 
  and 
  8 
  exhibit 
  details 
  and 
  are 
  fairly 
  representative 
  of 
  a 
  

   large 
  number 
  of 
  occurrences. 
  

  

  The 
  profound 
  gorge 
  of 
  La 
  Paz 
  with 
  its 
  great 
  accumula- 
  

  

  Fig. 
  5. 
  

  

  Fig. 
  5. 
  View 
  of 
  Bad 
  Lands, 
  South 
  Dakota. 
  

   Geological 
  Survey. 
  

  

  Photo 
  by 
  Darton, 
  U. 
  S. 
  

  

  tion 
  of 
  unconsolidated 
  sediments 
  and 
  striking 
  erosion 
  features 
  

   has 
  naturally 
  attracted 
  the 
  attention 
  of 
  scientists 
  and 
  travelers 
  

   alike. 
  D'Orbigny* 
  speaks 
  of 
  the 
  La 
  Paz 
  deposits 
  as 
  "allu- 
  

   vial," 
  and 
  notes 
  that 
  sandstone 
  pebbles 
  were 
  more 
  abundant 
  in 
  

   the 
  upper 
  beds. 
  He 
  also 
  recognized 
  kaolin 
  deposits 
  at 
  Mira- 
  

   flores, 
  — 
  a 
  suburb 
  not 
  visited 
  by 
  the 
  writer. 
  Forbesf 
  assigns 
  

  

  * 
  Voyage 
  dans 
  Amerique 
  Meridionale, 
  Tomo 
  III, 
  1842, 
  partie 
  3, 
  p. 
  120. 
  

   f 
  Report 
  on 
  the 
  Geology 
  of 
  South 
  America, 
  Quar. 
  Jour. 
  Geol. 
  Soc, 
  vol. 
  

   xvii, 
  1860. 
  

  

  