﻿PBALE.] 
  MESOZOIC 
  FOSMATIONS 
  TRIASSIC 
  SECTIONS. 
  83 
  

  

  Feet. 
  

  

  1. 
  Light-red 
  and 
  white 
  sandstone 
  400 
  

  

  2. 
  Massive 
  blood-red 
  sandstone 
  500 
  

  

  3. 
  Fine 
  soft 
  red 
  shales 
  , 
  280 
  

  

  4. 
  Shales 
  and 
  sandstones, 
  dark 
  red 
  and 
  brown 
  520 
  

  

  5. 
  Purplish-red 
  shales, 
  reaching 
  to 
  base 
  of 
  cliffs 
  440 
  

  

  Some 
  of 
  the 
  lower 
  beds 
  in 
  this 
  section 
  are 
  probably 
  Permian 
  ; 
  but 
  it 
  

   is 
  impossible 
  to 
  draw 
  any 
  line 
  between 
  them 
  and 
  the 
  beds 
  that 
  are 
  un- 
  

   doubtedly 
  Triassic. 
  South 
  of 
  the 
  Salt 
  Mountains, 
  I 
  am 
  inclined 
  to 
  believe 
  

   that 
  the 
  red 
  beds 
  prevail. 
  On 
  the 
  west, 
  in 
  the 
  immediate 
  vicinity 
  of 
  

   the 
  mountains, 
  I 
  think 
  the 
  red 
  beds 
  are 
  covered 
  by 
  the 
  Jurassic 
  shales 
  

   and 
  Dakota 
  sandstone, 
  (No. 
  1 
  Cretaceous.) 
  Farther 
  west, 
  the 
  red 
  beds 
  

   show 
  as 
  seen 
  from 
  the 
  summits 
  of 
  the 
  mountains, 
  and 
  at 
  one 
  place 
  

   seemed 
  to 
  be 
  worn 
  into 
  huge 
  roches 
  moutonnSes. 
  We 
  were 
  too 
  far 
  away, 
  

   and 
  too 
  high 
  above 
  the 
  level 
  of 
  the 
  country, 
  to 
  obtain 
  any 
  details 
  of 
  the 
  

   structure 
  in 
  that 
  direction. 
  

  

  In 
  the 
  Canon 
  Colorado, 
  Professor 
  lifewberry 
  gives 
  the 
  following 
  sec- 
  

   tion 
  : 
  * 
  

  

  Feet. 
  

  

  7. 
  Eed, 
  yellow, 
  or 
  white 
  massive 
  calcareous 
  sandstone 
  ; 
  no 
  fossils. 
  550 
  

  

  8. 
  Eed 
  thin-bedded 
  sandstones, 
  with 
  red 
  shales 
  ; 
  no 
  fossils 
  150 
  

  

  9. 
  Eed 
  and 
  brov>'n 
  massive 
  sandstone, 
  fine 
  grained, 
  not 
  hard 
  ; 
  no 
  

  

  fossils 
  270 
  

  

  10. 
  Soft 
  red 
  sandstone^ 
  in 
  thin 
  layers, 
  separated 
  by 
  beds 
  of 
  red 
  or 
  

  

  dark-brown 
  shales 
  350 
  

  

  11. 
  Greenish-gray 
  micaceous 
  conglomerate 
  and 
  gray 
  sandstone, 
  

  

  separated 
  by 
  red 
  and 
  purple 
  shales 
  92 
  

  

  12. 
  Soft 
  liver-colored 
  sandstones, 
  becoming, 
  suddenly 
  and 
  locally, 
  

  

  nearly 
  white, 
  with 
  partings 
  of 
  shale 
  350 
  

  

  13. 
  Brick-red, 
  massive, 
  calcareous 
  sandstones, 
  with 
  some 
  like 
  the 
  

  

  last. 
  164 
  

  

  The 
  following 
  is 
  a 
  comparison 
  of 
  the 
  thicknesses 
  of 
  the 
  sections 
  just 
  

   given 
  : 
  

  

  Salt 
  Creek. 
  Grand 
  River. 
  Canon 
  Colorado 
  — 
  

  

  (Newberry.) 
  

  

  No- 
  1' 
  \r(\(\ 
  f^f 
  No. 
  1, 
  400 
  feet. 
  No. 
  7, 
  ^-^n 
  . 
  . 
  

   No.sir^^^^'- 
  No. 
  2, 
  500 
  " 
  No. 
  s] 
  T^^ 
  ^^*- 
  

   No. 
  3, 
  700 
  " 
  No. 
  3, 
  280 
  " 
  No. 
  9, 
  270 
  " 
  

   No. 
  4, 
  300 
  " 
  No. 
  4, 
  ^Qf.^ 
  .. 
  No. 
  10, 
  350 
  " 
  

   No. 
  5, 
  700 
  " 
  No. 
  5, 
  r 
  No. 
  11, 
  ) 
  

  

  No. 
  12, 
  >606 
  " 
  

   No. 
  13, 
  ) 
  

  

  2,300 
  feet. 
  2, 
  140 
  feet. 
  1,926 
  feet. 
  

  

  Deducting, 
  probably 
  : 
  

   Permian? 
  700 
  " 
  960 
  " 
  606 
  " 
  

  

  Triassic? 
  1,600 
  feet. 
  1,180 
  feet. 
  l,320feet. 
  

  

  In 
  the 
  section 
  on 
  Grand 
  Eiver 
  we 
  hardly 
  have 
  the 
  top 
  of 
  the 
  series, 
  

   and 
  at 
  the 
  base 
  we 
  probably 
  extend 
  farther 
  into 
  the 
  Carboniferous 
  than 
  

   in 
  the 
  other 
  sections, 
  as 
  the 
  beds 
  are 
  partially 
  concealed, 
  and 
  we 
  could 
  

   not 
  draw 
  any 
  lines 
  of 
  demarkatiou. 
  

  

  Between 
  the 
  Dolores, 
  San 
  Miguel, 
  and 
  Lone 
  Cone, 
  there 
  are 
  outcrops 
  

   of 
  red 
  beds, 
  but 
  their 
  consideration 
  will 
  have 
  to 
  be 
  deferred 
  until 
  the 
  

   region 
  has 
  been 
  visited. 
  They 
  were 
  seen 
  from 
  too 
  great 
  a 
  distance 
  to 
  

   give 
  any 
  details. 
  There 
  appear 
  to 
  be 
  several 
  folds 
  which 
  bring 
  the 
  

  

  * 
  Exploring 
  Expedition 
  to 
  Junction 
  of 
  Grand 
  and 
  Green, 
  p. 
  99. 
  

  

  