﻿Stratigraphy 
  of 
  Eastern 
  New 
  Mexico. 
  Ill 
  

  

  few 
  miles 
  below 
  Anton 
  Chico. 
  It 
  is 
  also 
  exposed 
  for 
  

   many 
  miles 
  in 
  upper 
  Pintada 
  Canon 
  and 
  forms 
  the 
  sur- 
  

   face 
  of 
  a 
  large 
  area 
  west 
  of 
  Fort 
  Sumner. 
  Altogether, 
  

   it 
  covers 
  or 
  probably 
  underlies 
  fully 
  half 
  of 
  New 
  Mexico 
  

   east 
  of 
  the 
  Rio 
  Grande. 
  

  

  Going 
  southward 
  from 
  the 
  Rocky 
  Mountains 
  proper, 
  

   the 
  Yeso 
  is 
  first 
  seen 
  in 
  the 
  basin 
  of 
  the 
  Pecos 
  River 
  near 
  

   Anton 
  Chico, 
  where 
  it 
  overlies 
  the 
  Abo 
  and 
  is 
  overlain 
  by 
  

   the 
  Glorieta 
  sandstone 
  of 
  the 
  Upper 
  Trias. 
  In 
  all 
  cen- 
  

   tral 
  New 
  Mexico 
  it 
  has 
  about 
  the 
  same 
  lithologic 
  charac- 
  

   teristics 
  as 
  in 
  the 
  sections 
  described 
  by 
  Lee. 
  Well 
  

   borings 
  in 
  the 
  Pecos 
  Valley 
  east 
  of 
  the 
  Sacramento 
  

   Mountains 
  show 
  that 
  it 
  contains 
  thick 
  salt 
  beds. 
  

  

  The 
  Yeso 
  section 
  of 
  Coyote 
  Basin, 
  northern 
  Sacra- 
  

   mento 
  Mountains, 
  is 
  1300 
  feet 
  thick, 
  with 
  red 
  beds, 
  clay, 
  

   sandstone, 
  limestone, 
  and 
  much 
  gypsum. 
  This 
  section 
  

   contains 
  a 
  number 
  of 
  sills 
  of 
  gray-colored 
  porphyry. 
  

   The 
  Yeso 
  is 
  but 
  900 
  feet 
  thick 
  east 
  of 
  Juniper 
  Tank, 
  

   southern 
  Sacramento 
  Mountains, 
  nearly 
  three-fourths 
  of 
  

   which 
  is 
  thin- 
  and 
  medium-bedded 
  gray 
  limestone. 
  Here 
  

   there 
  are 
  but 
  two 
  horizons 
  of 
  gypsum, 
  one 
  of 
  which, 
  inter- 
  

   bedded 
  with 
  clay, 
  sandstone 
  and 
  limestone, 
  makes 
  up 
  the 
  

   lower 
  157 
  feet, 
  the 
  other, 
  together 
  with 
  its 
  interbedded 
  

   limestone, 
  occupying 
  15 
  feet 
  in 
  the 
  middle 
  of 
  the 
  forma- 
  

   tion. 
  In 
  the 
  southern 
  San 
  Andreas 
  Mountains 
  the 
  Yeso 
  

   contains 
  a 
  thin 
  bed 
  of 
  gypsum 
  at 
  the 
  base 
  and 
  a 
  50 
  foot 
  

   bed 
  a 
  few 
  feet 
  above 
  the 
  middle. 
  

  

  The 
  Yeso 
  four 
  miles 
  north 
  of 
  Wilker 
  son's 
  Ranch 
  

   house, 
  along 
  the 
  western 
  escarpment 
  of 
  the 
  northern 
  

   Guadalupe 
  Mountains, 
  has 
  an 
  exposed 
  thickness 
  of 
  960 
  

   feet, 
  the 
  base 
  there 
  not 
  being 
  seen. 
  No 
  red 
  beds 
  are 
  

   found 
  where 
  the 
  detailed 
  section 
  was 
  made, 
  but 
  some 
  

   were 
  noted 
  a 
  short 
  distance 
  to 
  the 
  south. 
  This 
  section 
  

   shows 
  a 
  large 
  amount 
  of 
  gypsum, 
  interbedded 
  with 
  light- 
  

   colored 
  limestone 
  and 
  clay. 
  Farther 
  south 
  along 
  the 
  

   west 
  scarp 
  of 
  the 
  Guadalupe 
  Mountains 
  in 
  the 
  east 
  wall 
  

   of 
  lower 
  Dog 
  Canon, 
  some 
  five 
  miles 
  north 
  of 
  El 
  Paso 
  

   Gap, 
  about 
  250 
  feet 
  of 
  upper 
  Yeso 
  is 
  exposed. 
  The 
  lower 
  

   beds 
  there 
  seen 
  are 
  thin-bedded 
  nodular 
  cherty 
  limestone 
  

   carrying 
  a 
  small 
  Chonetes, 
  interbedded 
  with 
  gypsum. 
  

   Above 
  is 
  about 
  200 
  feet 
  of 
  light 
  blue-gray, 
  thin- 
  and 
  

   irregular-bedded, 
  markedly 
  nodular 
  limestone, 
  full 
  of 
  

   small 
  caves, 
  underlain 
  by 
  medium-bedded 
  gray 
  limestone 
  

   with 
  nodules 
  of 
  chert, 
  this 
  limestone 
  carrying 
  a 
  Hustedia, 
  

  

  