﻿208 
  R. 
  E. 
  Gregory 
  — 
  Geologic 
  Sketch 
  of 
  

  

  Feet 
  

  

  21. 
  Shale 
  ; 
  arenaceous, 
  argillaceous, 
  aud 
  carbonaceous 
  ; 
  with 
  

  

  abundant 
  plant 
  impressions 
  and 
  lenses 
  of 
  impure 
  coal 
  15 
  

  

  22. 
  Sandstone 
  ; 
  white 
  and 
  arenaceous 
  ; 
  drab 
  shale 
  in 
  beds 
  

  

  2"-l' 
  40 
  

  

  23. 
  Sandstone; 
  white, 
  cross-bedded, 
  as 
  No. 
  18 
  ... 
  40 
  

  

  24. 
  Sandstone 
  ; 
  brown 
  ; 
  in 
  beds 
  2 
  '-4', 
  with 
  thin 
  brown 
  and 
  

   drab 
  shale 
  partings 
  _ 
  30 
  

  

  25. 
  Sandstone 
  ; 
  brown 
  and 
  gray 
  ; 
  in 
  beds 
  3-15', 
  with 
  argil- 
  

   laceous, 
  arenaceous, 
  and 
  carbonaceous 
  shales, 
  exhibiting 
  

   ripple 
  marks, 
  sun-cracks, 
  and 
  worm 
  prints 
  . 
  200 
  

  

  26. 
  Sandstone 
  ; 
  in 
  three 
  beds 
  (30', 
  10', 
  10') 
  with 
  white 
  and 
  

  

  gray 
  shale 
  partings 
  . 
  _ 
  50 
  

  

  27. 
  Sandstone 
  ; 
  gray 
  and 
  yellow 
  ; 
  in 
  thin 
  beds 
  with 
  black 
  

  

  and 
  drab 
  shales, 
  constituting 
  about 
  J 
  of 
  the 
  material 
  75 
  

  

  Section 
  B. 
  

  

  Southeast 
  end 
  of 
  Titlcaca 
  Island 
  from 
  summit 
  of 
  ridge 
  

  

  to 
  Kona 
  Bay. 
  

  

  Measured 
  by 
  K. 
  C. 
  Heald. 
  General 
  strike 
  N. 
  25° 
  W. 
  

  

  Feet 
  

  

  1. 
  Thin 
  layer 
  of 
  ash 
  (?). 
  

  

  2. 
  Limestone 
  ; 
  blue-gray 
  ; 
  fossiliferous 
  ; 
  massive. 
  Dip, 
  

  

  N. 
  20° 
  E. 
  _.._ 
  515 
  

  

  3. 
  Talus-covered, 
  but 
  mostly 
  thin-bedded 
  limestone 
  ; 
  fossil- 
  

   iferous 
  ; 
  two 
  bands 
  of 
  shale 
  _ 
  200 
  

  

  4. 
  Limestone; 
  thin-bedded; 
  hard 
  _ 
  75 
  

  

  5. 
  Sandstone 
  ; 
  medium-grained 
  ; 
  pebbles, 
  red 
  and 
  white 
  ; 
  

   matrix, 
  and 
  general 
  color, 
  green; 
  soft, 
  thin-bedded, 
  cross- 
  

   bedded 
  in 
  places; 
  three 
  bands 
  of 
  dove-colored 
  limestone 
  35 
  

  

  6. 
  Limestone; 
  hard, 
  blue-gray 
  and 
  soft 
  yellow 
  ; 
  top 
  bed 
  

  

  dove-colored; 
  beds 
  6"-l' 
  ; 
  fossiliferous 
  65 
  

  

  7. 
  Sandstone; 
  coarse, 
  clear 
  and 
  white, 
  well-rounded 
  grains 
  40 
  

  

  8. 
  Sandstone; 
  medium-grained; 
  gray 
  to 
  green; 
  rounded, 
  

   clear, 
  green 
  and 
  red 
  grains 
  ; 
  massive; 
  hard 
  to 
  medium. 
  

   Dip 
  N.E./48 
  40 
  

  

  9. 
  Sandstone; 
  soft; 
  medium 
  to 
  coarse; 
  purplish 
  to 
  gray, 
  top 
  

   greenish; 
  quartz 
  grains, 
  clear, 
  red, 
  green, 
  and 
  black, 
  be- 
  

   sides 
  specks 
  of 
  lime. 
  Bed 
  of 
  lime 
  (4') 
  in 
  middle. 
  Spar- 
  

   ingly 
  fossiliferous. 
  At 
  top 
  sandstone 
  is 
  harder 
  and 
  

   includes 
  zone 
  of 
  brecciation 
  150 
  

  

  10. 
  Sandstone; 
  massive; 
  medium-grained 
  quartz, 
  clear, 
  green, 
  

  

  red 
  and 
  black; 
  also 
  lime 
  specks; 
  all 
  in 
  green 
  cement; 
  

   soft, 
  but 
  forms 
  cliff 
  face 
  ... 
  13 
  

  

  11. 
  Shale; 
  maroon, 
  in 
  part 
  gray-green 
  ; 
  bed 
  of 
  soft 
  sand- 
  

   stone 
  at 
  50'; 
  some 
  seams 
  of 
  limestone 
  running 
  across 
  

   strike 
  100 
  

  

  12. 
  Shale, 
  gray-green 
  16 
  

  

  