﻿122 
  C. 
  L. 
  Baker 
  — 
  Contributions 
  to 
  the 
  

  

  Base. 
  

  

  1. 
  Sandstone, 
  heavy-bedded, 
  resistant, 
  brown, 
  ferrugi- 
  

  

  nous, 
  and 
  finely 
  conglomeratic. 
  Cut 
  at 
  base 
  with 
  

   network 
  of 
  fine 
  veins. 
  "Upper 
  half 
  more 
  firmly 
  

   cemented 
  and 
  cream-colored 
  when 
  free 
  from 
  iron 
  100' 
  

  

  2. 
  Carbonaceous 
  shale, 
  blue-black, 
  with 
  well 
  indurated 
  

  

  brown 
  sandstone 
  interbedded 
  13' 
  

  

  3. 
  Sandstone, 
  buff, 
  ferruginous, 
  well 
  cemented, 
  sugary- 
  

  

  textured, 
  conglomeratic, 
  veined, 
  laminated 
  and 
  

   cross-bedded 
  10' 
  

  

  4. 
  Sandstone, 
  brown 
  mottled 
  with 
  black, 
  fucoidal 
  mark- 
  

  

  ings 
  very 
  abundant 
  in 
  upper 
  half 
  15' 
  

  

  Total 
  thickness 
  138' 
  

  

  In 
  the 
  vicinity 
  of 
  Capitan 
  in 
  Lincoln 
  County, 
  the 
  

   Dakota 
  is 
  for 
  the 
  most 
  part 
  very 
  dark 
  brown 
  or 
  reddish 
  

   in 
  color. 
  

  

  The 
  post-Dakota 
  Cretaceous 
  of 
  northern 
  New 
  Mexico 
  

   has 
  the 
  Great 
  Plains 
  facies 
  east 
  of 
  the 
  Sangre 
  de 
  Cristo 
  

   Range, 
  and 
  the 
  Intermontane 
  facies 
  west 
  of 
  that 
  range. 
  

   The 
  Great 
  Plains 
  facies 
  shows 
  only 
  shales 
  and 
  limestones 
  

   from 
  the 
  base 
  of 
  the 
  Benton 
  to 
  the 
  top 
  of 
  the 
  Pierre 
  ; 
  the 
  

   Intermontane 
  facies 
  west 
  of 
  the 
  Rocky 
  Mountains 
  Front 
  

   Range 
  is 
  probably 
  more 
  than 
  half 
  sandstone 
  and 
  contains 
  

   beds 
  of 
  coal 
  in 
  the 
  strata 
  from 
  Benton 
  age 
  upwards. 
  

  

  The 
  following 
  section 
  of 
  rocks 
  of 
  Benton 
  age 
  was 
  made 
  

   one 
  mile 
  south 
  of 
  Las 
  Vegas 
  : 
  

  

  Base. 
  

  

  1. 
  Sandstone, 
  coarse-grained, 
  containing 
  an 
  occasional 
  

  

  small 
  pebble, 
  generally 
  gray 
  or 
  brown; 
  with 
  

   fucoidal 
  markings. 
  Lower 
  10 
  feet 
  blue-black 
  in 
  

   color 
  from 
  carbonaceous 
  matter, 
  and 
  full 
  of 
  plant 
  

   impressions, 
  sandstone 
  medium-grained 
  in 
  this 
  

   member. 
  The 
  bedding 
  is 
  very 
  irregular, 
  possibly 
  

   from 
  current 
  action. 
  The 
  beds 
  are 
  thin 
  and 
  

   contain 
  local 
  lenticles 
  of 
  light 
  buff 
  sandstone, 
  

   locally 
  quartzitic, 
  and 
  harder 
  than 
  the 
  carbona- 
  

   ceous 
  sandstone. 
  

  

  2. 
  Sandstone, 
  soft, 
  shaly, 
  very 
  carbonaceous, 
  with 
  

  

  plant 
  impressions 
  1' 
  

  

  3. 
  Sandstone, 
  buff, 
  thin-bedded 
  and 
  very 
  irregular, 
  

  

  locally 
  quartzitic 
  and 
  carbonaceous 
  10' 
  

  

  4. 
  Dark 
  carbonaceous 
  shale 
  0-5' 
  

  

  5. 
  Sandstone, 
  buff, 
  thin- 
  and 
  irregular-bedded 
  6' 
  

  

  6. 
  Sandstone, 
  cross-, 
  wavy-, 
  and 
  contorted-bedded 
  ; 
  

  

  