﻿Stratigraphy 
  of 
  Eastern 
  New 
  Mexico. 
  115 
  

  

  glaring 
  white. 
  Chert 
  is 
  very 
  sparsely 
  represented. 
  

   There 
  are 
  a 
  number 
  of 
  beds 
  of 
  brown 
  sandstone 
  in 
  the 
  

   Capitan 
  limestone 
  in 
  the 
  summit 
  range 
  of 
  the 
  Guadalupe 
  

   Mountains. 
  There 
  is 
  a 
  quite 
  thick 
  member 
  of 
  brown 
  

   sandstone 
  near 
  the 
  base 
  of 
  the 
  Capitan 
  at 
  the 
  north 
  end 
  

   of 
  the 
  main 
  western 
  escarpment. 
  Ehombohedral 
  calcite 
  

   and 
  pseudomorphs 
  of 
  limonite 
  after 
  pyrite 
  are 
  quite 
  

   characteristic 
  of 
  the 
  limestone. 
  The 
  Capitan 
  in 
  the 
  

   northwestern 
  area 
  of 
  its 
  outcrop 
  contains 
  very 
  few 
  fos- 
  

   sils; 
  all 
  noted 
  by 
  the 
  writer 
  belonged 
  to 
  three 
  common 
  

   gastropod 
  species. 
  In 
  El 
  Capitan 
  Peak 
  and 
  to 
  the 
  south- 
  

   ward 
  (in 
  Texas) 
  fossils 
  are 
  more 
  abundant, 
  thick 
  beds 
  

   being 
  composed 
  almost 
  entirely 
  of 
  Fusulina 
  elongata. 
  

   The 
  heavy 
  limestone 
  phase 
  of 
  the 
  Capitan 
  is 
  found 
  in 
  a 
  

   roughly 
  triangular 
  area 
  between 
  the 
  mouth 
  of 
  Dog 
  Canon 
  

   on 
  the 
  northwest, 
  Guadalupe 
  Point 
  and 
  the 
  escarp- 
  

   ment 
  running 
  from 
  Guadalupe 
  Point 
  to 
  near 
  Carlsbad 
  on 
  

   the 
  southeast, 
  and 
  the 
  Breaks 
  of 
  Seven 
  Rivers 
  on 
  the 
  

   northeast. 
  This 
  region 
  comprises 
  the 
  northeastern 
  dip 
  

   slope 
  of 
  the 
  Guadalupe 
  Mountains, 
  and 
  the 
  prominent 
  

   higher 
  cliffs 
  of 
  the 
  western 
  escarpment. 
  The 
  large 
  caves 
  

   of 
  the 
  Guadalupe 
  Mountains 
  are 
  in 
  the 
  Capitan 
  limestone. 
  

  

  Near 
  the 
  east 
  base 
  of 
  the 
  Guadalupe 
  Mountains 
  the 
  

   Capitan 
  changes 
  along 
  the 
  strike 
  into 
  the 
  Pecos 
  Valley 
  

   red 
  beds. 
  The 
  transition 
  is 
  well 
  seen 
  in 
  the 
  walls 
  of 
  

   Rocky 
  Arroyo, 
  20 
  miles 
  west 
  of 
  Carlsbad. 
  The 
  strata 
  in 
  

   the 
  Breaks 
  of 
  Seven 
  Rivers 
  at 
  the 
  upper 
  end 
  of 
  the 
  nar- 
  

   rows 
  of 
  Rocky 
  Arroyo 
  consist 
  of 
  red 
  clay, 
  gray 
  and 
  red 
  

   sandstone, 
  light 
  gray 
  limestone, 
  with 
  many 
  interbeds 
  of 
  

   gypsum. 
  Traced 
  two 
  miles 
  down 
  the 
  Arroyo 
  the 
  red 
  

   beds 
  and 
  gypsum 
  pass 
  into 
  thin-bedded 
  limestone, 
  weath- 
  

   ering 
  brown, 
  underlain 
  by 
  brownish 
  sandstone. 
  A 
  mile 
  

   farther 
  down, 
  the 
  limestone 
  becomes 
  heavy-bedded 
  and 
  

   represents 
  typical 
  Capitan. 
  

  

  The 
  typical 
  Capitan 
  limestone 
  dips 
  beneath 
  the 
  Pecos 
  

   Valley 
  alluvium 
  about 
  two 
  miles 
  west 
  of 
  Carlsbad. 
  Six 
  

   miles 
  east 
  of 
  Carlsbad 
  in 
  Section 
  4, 
  Township 
  22, 
  Range 
  

   28, 
  is 
  the 
  Andrews 
  boring, 
  2890 
  feet 
  in 
  depth, 
  samples 
  

   from 
  which 
  were 
  chemically 
  analyzed 
  at 
  the 
  University 
  

   of 
  Kansas. 
  The 
  record 
  of 
  this 
  boring 
  follows 
  : 
  

  

  Thickness 
  Rock 
  Depth. 
  

  

  14 
  feet 
  Gypsum 
  14 
  feet 
  

  

  106 
  " 
  "Red 
  cavey 
  sand 
  120 
  " 
  

  

  55 
  ' 
  ' 
  Soft 
  limestone, 
  with 
  water 
  175 
  " 
  ' 
  

  

  