﻿Stratigraphy 
  of 
  Eastern 
  New 
  Mexico. 
  113 
  

  

  dalupian 
  and 
  underlying 
  beds 
  in 
  the 
  western 
  escarpments 
  

   of 
  the 
  Guadalupe 
  Mountains 
  about 
  one-half 
  mile 
  north 
  of 
  

   Bone 
  Springs, 
  Texas, 
  a 
  locality 
  a 
  few 
  miles 
  south 
  of 
  the 
  

   New 
  Mexico 
  line. 
  

  

  Base. 
  

  

  1. 
  Blue-gray 
  limestone, 
  rather 
  uniform-bedded, 
  with 
  

  

  brown 
  chert 
  nodules. 
  Strata 
  average 
  about 
  6 
  

   inches 
  in 
  thickness 
  dz 
  200' 
  

  

  2. 
  Thin-bedded 
  blue-gray 
  limestone, 
  with 
  lenses 
  and 
  

  

  nodules 
  of 
  brown 
  and 
  black 
  chert. 
  Chert 
  forms 
  

   about 
  one 
  half 
  of 
  total. 
  The 
  member 
  is 
  trav- 
  

   ersed 
  at 
  places 
  about 
  100 
  feet 
  and 
  300 
  feet 
  

   above 
  the 
  base 
  and 
  at 
  the 
  top 
  by 
  thrust 
  planes 
  

   cutting 
  diagonally 
  across 
  the 
  bedding. 
  The 
  

   limestone 
  is 
  a 
  prominent 
  cliff-former 
  from 
  about 
  

   290 
  feet 
  above 
  its 
  base 
  to 
  its 
  top. 
  There 
  is 
  a 
  

   steep 
  cliff 
  100 
  feet 
  high 
  beginning 
  430 
  feet 
  

   above 
  the 
  base. 
  Both 
  silicified 
  and 
  non-silici- 
  

   fied 
  fossils 
  noted 
  in 
  upper 
  half. 
  Abundant 
  

   casts 
  of 
  Lyttonia 
  at 
  top. 
  Spines 
  of 
  Archceoci- 
  

   daris 
  as 
  much 
  as 
  four 
  inches 
  long. 
  Many 
  

   Bryozoa 
  and 
  Orthopecten 
  vanvleeti 
  (field 
  deter- 
  

   mination) 
  at 
  top. 
  This 
  member 
  forms 
  a 
  promi- 
  

   nent 
  scarp 
  at 
  westernmost 
  base 
  of 
  the 
  Guadalupe 
  

   Mountains 
  at 
  this 
  locality. 
  The 
  member 
  dips 
  

   gently 
  to 
  the 
  south 
  along 
  the 
  major 
  axis 
  of 
  the 
  

   range, 
  only 
  a 
  few 
  feet 
  being 
  exposed 
  at 
  the 
  

   mouth 
  of 
  Guadalupe 
  Canon. 
  Total 
  thickness 
  ± 
  600' 
  

  

  3. 
  Limestone, 
  heavier-bedded 
  than 
  that 
  below, 
  wea- 
  

  

  thering 
  light 
  gray 
  or 
  buff, 
  with 
  cherty 
  nodules 
  

   and 
  many 
  concentric 
  brown 
  chert 
  concretions 
  

   up 
  to 
  two 
  feet 
  in 
  size, 
  forms 
  steep 
  slopes. 
  

   Archceocidaris 
  spines 
  near 
  base 
  150' 
  

  

  4. 
  Limestone, 
  massive, 
  very 
  cavernous, 
  weathering 
  

  

  brown, 
  containing 
  nodular 
  chert, 
  with 
  an 
  irreg- 
  

   ular 
  contact 
  at 
  base. 
  Caverns 
  contain 
  spongy 
  

   and 
  stalactitic 
  limonite. 
  Large 
  Lyttonia 
  20-50' 
  

  

  Irregular 
  erosional 
  unconformity. 
  

  

  5. 
  Sandstone, 
  brown, 
  thin 
  platy-bedded 
  25' 
  

  

  6. 
  Gray 
  sandy 
  limestone 
  with 
  chert, 
  thin-bedded 
  ... 
  18' 
  

  

  7. 
  Sandstone, 
  yellow-brown, 
  thin-bedded 
  and 
  evenly 
  

  

  laminated 
  in 
  the 
  lower 
  part 
  where 
  there 
  is 
  some 
  

   gray 
  sandy 
  shale; 
  thicker-bedded 
  above 
  and 
  

   calcareous 
  at 
  top. 
  Forms 
  a 
  prominent 
  bench 
  

   in 
  the 
  scarp 
  profile. 
  Many 
  molds 
  of 
  Fusulina 
  

   elongata 
  as 
  well 
  as 
  other 
  fossils 
  550' 
  

  

  