﻿92 
  EEPOET 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  fold, 
  the 
  axis 
  of 
  which 
  is 
  approximately 
  parallel 
  to 
  the 
  course 
  of 
  the 
  

   Uncompahgre 
  Eiver. 
  Toward 
  the 
  southern 
  end 
  of 
  the 
  plateau 
  there 
  

   are 
  remnants 
  of 
  the 
  shales, 
  as 
  at 
  station 
  15, 
  which 
  give 
  a 
  more 
  broken 
  

   appearance 
  to 
  the 
  surface. 
  Between 
  Dallas 
  Fork 
  of 
  the 
  Uncompahgre 
  

   and 
  the 
  San 
  Juan 
  Mountains, 
  the 
  lower 
  portion 
  of 
  the 
  shales 
  forms 
  

   rounded 
  hillocks 
  between 
  the 
  branches 
  of 
  the 
  stream. 
  

  

  Near 
  the 
  base 
  of 
  Lone 
  Cone 
  on 
  the 
  north, 
  remnants 
  of 
  the 
  shales 
  

   are 
  again 
  seen, 
  extending 
  northward. 
  These 
  will 
  be 
  described 
  by 
  Mr. 
  

   Holmes. 
  

  

  On 
  the 
  highest 
  peak 
  of 
  the 
  Sierra 
  la 
  Sal 
  is 
  a 
  capping 
  of 
  sandstones 
  

   and 
  shales, 
  all 
  very 
  much 
  metamorphosed. 
  They 
  are 
  probably 
  a 
  portion 
  

   of 
  No. 
  2 
  Cretaceous, 
  and 
  perhaps 
  a 
  portion 
  of 
  the 
  upper 
  part 
  of 
  the 
  

   Dakota 
  group. 
  In 
  the 
  eruption 
  of 
  the 
  rock 
  they 
  were 
  evidently 
  not 
  

   broken 
  through, 
  as 
  the 
  lower 
  rocks 
  were, 
  but 
  were 
  carried 
  to 
  the 
  summit 
  

   of 
  the 
  mass. 
  In 
  other 
  peaks 
  near 
  the 
  one 
  just 
  referred 
  to, 
  patches 
  of 
  

   black 
  metamorphosed 
  shales 
  are 
  seen 
  on 
  the 
  sides 
  of 
  the 
  peaks 
  im- 
  

   bedded 
  in 
  the 
  eruntive 
  rock. 
  

  

  