﻿124 
  C. 
  L. 
  Baker 
  — 
  Contributions 
  to 
  the 
  

  

  sandstone 
  with 
  thin 
  layers 
  of 
  brown 
  limestone 
  carrying 
  

   Inoceramus 
  labiatus, 
  Cardium 
  and 
  Ostrea. 
  These 
  beds 
  

   pass 
  upwards 
  into 
  heavy 
  beds 
  of 
  conglomerate 
  with 
  

   bowlders 
  of 
  the 
  underlying 
  San 
  Andreas 
  limestone 
  and 
  

   brown 
  sandstone 
  up 
  to 
  three 
  feet 
  in 
  size. 
  Most 
  of 
  the 
  

   Cretaceous, 
  which 
  is 
  not 
  far 
  from 
  1000 
  feet 
  in 
  total 
  thick- 
  

   ness 
  here, 
  consists 
  of 
  red 
  terrigenous 
  sediments 
  probably 
  

   derived 
  from 
  erosion 
  of 
  the 
  red 
  beds. 
  

  

  The 
  following 
  small 
  section 
  of 
  the 
  lower 
  Pierre 
  was 
  

   measured 
  in 
  a 
  butte 
  about 
  two 
  miles 
  east 
  of 
  Las 
  Vegas 
  

   Hot 
  Springs 
  : 
  

  

  Base. 
  

  

  1. 
  Dark 
  blue-gray 
  sandy 
  shale 
  ± 
  100' 
  

  

  2. 
  Dark 
  blue-gray 
  and 
  dark 
  brown 
  sandy 
  shale 
  30' 
  

  

  3. 
  Dark 
  brown 
  sandy 
  shale 
  25' 
  

  

  4. 
  Layer 
  one-fourth 
  to 
  one-half 
  inch 
  thick 
  of 
  lime- 
  

  

  stone, 
  mainly 
  composed 
  of 
  fish 
  bones 
  and 
  spines. 
  

  

  5. 
  Dark 
  brown 
  shale 
  10' 
  

  

  6. 
  Shale, 
  sandier, 
  less 
  finely 
  laminated 
  and 
  lighter 
  

  

  brown 
  in 
  color 
  than 
  below. 
  Locally 
  with 
  radi- 
  

   ating 
  markings 
  60' 
  

  

  The 
  mesa 
  is 
  covered 
  with 
  gravels 
  and 
  bowlders 
  of 
  

   metamorphic 
  and 
  plutonic 
  rocks 
  and 
  Magdalena 
  lime- 
  

   stone. 
  

  

  The 
  Cenozoic 
  Formations. 
  

  

  The 
  Galisteo 
  sandstone 
  of 
  the 
  Santa 
  Fe 
  Basin 
  may 
  be 
  

   at 
  least 
  in 
  part 
  of 
  Eocene 
  age. 
  The 
  Santa 
  Fe 
  marls 
  of 
  

   the 
  same 
  region 
  are 
  Upper 
  Miocene, 
  and 
  probably 
  were 
  

   deposited 
  in 
  a 
  structural 
  basin. 
  These 
  marls 
  consist 
  of 
  

   coarse 
  arkoses 
  on 
  the 
  west 
  flanks 
  of 
  the 
  Rockies 
  in 
  the 
  

   vicinity 
  of 
  Santa 
  Fe, 
  but 
  lower 
  down 
  in 
  the 
  Rio 
  Grande 
  

   Valley 
  they 
  become 
  for 
  the 
  most 
  part 
  fine 
  sands 
  and 
  silt, 
  

   although 
  they 
  are 
  probably 
  coarser 
  on 
  the 
  west 
  flanks 
  

   of 
  the 
  Sandia, 
  Manzano 
  and 
  Los 
  Pinos 
  ranges, 
  where 
  they 
  

   are 
  buried 
  beneath 
  more 
  recent 
  alluvium. 
  

  

  The 
  only 
  other 
  Tertiary 
  deposits 
  known 
  in 
  eastern 
  

   New 
  Mexico 
  are 
  those 
  capping 
  the 
  surfaces 
  of 
  the 
  Llano 
  

   Estacado 
  east 
  of 
  the 
  Pecos 
  River 
  and 
  of 
  the 
  High 
  Plains 
  

   north 
  and 
  east 
  of 
  the 
  Canadian 
  River. 
  These 
  have 
  been 
  

   described 
  and 
  interpreted 
  in 
  another 
  publication. 
  2 
  

  

  No 
  attempt 
  will 
  be 
  made 
  at 
  this 
  time 
  to 
  discuss 
  the 
  

   Pleistocene, 
  the 
  importance 
  of 
  which 
  in 
  the 
  southwest 
  de- 
  

  

  2 
  Baker, 
  Charles 
  Laurence 
  : 
  Geology 
  and 
  Underground 
  Waters 
  of 
  the 
  

   Northern 
  Llano 
  Estacado. 
  University 
  of 
  Texas 
  Bulletin 
  (1915) 
  No. 
  57. 
  

  

  