﻿C. 
  L. 
  Baker. 
  — 
  Stratigraphy 
  of 
  Eastern 
  New 
  Mexico. 
  99 
  

  

  Aet. 
  VII. 
  — 
  Contributions 
  to 
  the 
  Stratigraphy 
  of 
  East- 
  

   ern 
  New 
  Mexico; 
  by 
  Chaeles 
  Laueence 
  Bakee. 
  

  

  The 
  purpose 
  of 
  this 
  paper 
  is 
  to 
  present 
  a 
  short 
  sum- 
  

   mary 
  of 
  results 
  accomplished 
  in 
  a 
  geologic 
  exploration 
  

   of 
  about 
  50,000 
  square 
  miles 
  of 
  eastern 
  New 
  Mexico, 
  

   mainly 
  in 
  the 
  territory 
  between 
  the 
  Rio 
  Grande 
  and 
  the 
  

   Rio 
  Pecos, 
  from 
  the 
  latitude 
  of 
  Las 
  Vegas 
  on 
  the 
  north 
  

   to 
  beyond 
  the 
  Texas 
  boundary 
  on 
  the 
  south. 
  The 
  field 
  

   study 
  was 
  made 
  during 
  the 
  summers 
  of 
  1917, 
  1918 
  and 
  

   1919. 
  It 
  is 
  the 
  intention 
  to 
  describe 
  in 
  greater 
  detail 
  the 
  

   stratigraphy 
  and 
  the 
  numerous 
  igneous 
  rocks, 
  give 
  lists 
  

   of 
  fossils 
  collected, 
  and 
  to 
  present 
  generalizations 
  on 
  the 
  

   structure, 
  physiography 
  and 
  mode 
  of 
  origin 
  of 
  the 
  sedi- 
  

   mentary 
  rocks 
  in 
  a 
  later 
  report. 
  Doctors 
  N. 
  F. 
  Drake 
  

   and 
  Emil 
  Bose 
  were 
  associated 
  with 
  the 
  writer 
  in 
  most 
  of 
  

   the 
  field 
  work, 
  the 
  former 
  in 
  1918 
  and 
  the 
  latter 
  for 
  about 
  

   half 
  the 
  field 
  season 
  of 
  1919. 
  

  

  The 
  region 
  covered 
  embraces 
  portions 
  of 
  three 
  geo- 
  

   logic 
  provinces 
  : 
  the 
  Rocky 
  Mountains, 
  the 
  Basin 
  Ranges, 
  

   and 
  the 
  Great 
  Plains. 
  

  

  Structural 
  Geology. 
  

  

  The 
  high 
  summits 
  of 
  the 
  Rocky 
  Mountains 
  extend 
  as 
  

   far 
  south 
  as 
  the 
  southern 
  end 
  of 
  the 
  Sangre 
  de 
  Crist 
  o 
  

   Range, 
  but 
  the 
  long 
  regional 
  folds 
  of 
  the 
  Rocky 
  Moun- 
  

   tains 
  extend 
  from 
  the 
  Sangre 
  de 
  Cristo 
  Range 
  as 
  far 
  

   south 
  as 
  Torrance 
  and 
  Vaughn 
  in 
  central 
  New 
  Mexico 
  

   and 
  divide 
  the 
  plains 
  west 
  of 
  the 
  Pecos 
  River 
  on 
  the 
  east 
  

   from 
  the 
  interior 
  basins 
  of 
  central 
  New 
  Mexico 
  on 
  the 
  

   west. 
  The 
  isolated 
  outcrops 
  of 
  the 
  Basement 
  Complex 
  in 
  

   central 
  New 
  Mexico 
  lie 
  in 
  these 
  folds. 
  The 
  eastern 
  folds 
  

   of 
  the 
  Sangre 
  de 
  Cristo 
  Range 
  have 
  steeper 
  dips 
  on 
  their 
  

   east 
  flanks, 
  the 
  easternmost 
  or 
  Front 
  Range 
  fold 
  proper 
  

   being 
  locally 
  overturned 
  and 
  overthrust-f 
  aulted 
  north 
  of 
  

   Las 
  Vegas. 
  The 
  mountains 
  composed 
  of 
  post-Creta- 
  

   ceous 
  igneous 
  rocks, 
  situated 
  between 
  Torrance 
  on 
  the 
  

   north 
  and 
  Tularosa 
  on 
  the 
  south, 
  lie 
  in 
  a 
  large 
  synclinal 
  

   basin 
  separating 
  the 
  Rocky 
  Mountain 
  folds 
  from 
  the 
  

   mountains 
  of 
  the 
  Great 
  Basin 
  system 
  on 
  the 
  south 
  and 
  

   west. 
  The 
  Basin 
  Ranges 
  of 
  central 
  and 
  south-central 
  

   New 
  Mexico 
  lie 
  along 
  three 
  great 
  asymmetric 
  anticlines, 
  

  

  