﻿Stratigraphy 
  of 
  Eastern 
  New 
  Mexico. 
  ' 
  109 
  

  

  erate 
  above 
  which 
  are 
  heavy 
  clayey 
  sands. 
  The 
  latter 
  

   are 
  almost 
  if 
  not 
  entirely 
  lacking 
  two 
  or 
  three 
  miles 
  

   southeast 
  of 
  Rowe. 
  In 
  the 
  vicinity 
  of 
  Pulton 
  the 
  Abo 
  is 
  

   thicker 
  than 
  farther 
  northwest. 
  The 
  Abo 
  rests 
  with 
  

   angular 
  unconformity 
  upon 
  the 
  Magdalena 
  in 
  the 
  south 
  

   bluff 
  of 
  the 
  Pecos 
  one 
  mile 
  west 
  of 
  the 
  iron 
  bridge 
  

   between 
  Pecos 
  Village 
  and 
  Valley 
  Eanch. 
  Here 
  120-140 
  

   feet 
  above 
  the 
  base 
  of 
  the 
  Abo 
  a 
  gray 
  sandy 
  arkose 
  con- 
  

   tains 
  bowlders 
  of 
  Magdalena 
  limestone 
  up 
  to 
  three 
  feet 
  

   in 
  size 
  and 
  has 
  a 
  fauna 
  of 
  poorly 
  preserved 
  Composita, 
  

   Myalina, 
  horn 
  corals, 
  large 
  Productus 
  and 
  plant 
  frag- 
  

   ments. 
  A 
  few 
  fossils 
  occur 
  in 
  the 
  basal 
  calcareous 
  

   arkose 
  and 
  in 
  a 
  crystalline 
  crinoidal 
  limestone 
  from 
  40 
  

   to 
  80 
  feet 
  above 
  the 
  base. 
  

  

  Lee 
  in 
  his 
  Rowe 
  section 
  has 
  included 
  in 
  the 
  Abo 
  beds 
  

   several 
  hundred 
  feet 
  of 
  Magdalena 
  limestones 
  and 
  con- 
  

   glomerates. 
  He 
  was 
  doubtful 
  of 
  the 
  age 
  of 
  these 
  lower 
  

   red 
  be.ds 
  along 
  the 
  flanks 
  of 
  the 
  Sangre 
  de 
  Cristo 
  range, 
  

   but 
  Dr. 
  Bose 
  and 
  the 
  writer 
  in 
  tracing 
  them 
  south 
  found 
  

   them 
  overlain 
  by 
  the 
  Yeso, 
  hence 
  they 
  are 
  almost 
  cer- 
  

   tainly 
  a 
  part 
  of 
  the 
  Abo. 
  

  

  It 
  is 
  difficult 
  to 
  estimate 
  the 
  total 
  thickness 
  of 
  the 
  Abo 
  

   red 
  beds 
  on 
  the 
  east 
  flank 
  of 
  the 
  Sangre 
  de 
  Cristo 
  Range 
  

   at 
  Las 
  Vegas 
  Hot 
  Springs, 
  because 
  of 
  faulting 
  and 
  the 
  

   uncertainty 
  in 
  identification 
  of 
  the 
  Grlorieta 
  sandstone, 
  

   the 
  basal 
  bed 
  of 
  the 
  Upper 
  Trias. 
  However, 
  strata 
  un- 
  

   doubtedly 
  Abo 
  have 
  here 
  a 
  thickness 
  of 
  425 
  feet. 
  Far- 
  

   ther 
  north 
  along 
  the 
  Front 
  Range, 
  east 
  of 
  Mora 
  Bruce, 
  

   Martin 
  reports 
  several 
  thousand 
  feet 
  of 
  Abo 
  arkoses 
  and 
  

   red 
  beds. 
  

  

  The 
  Abo 
  contains 
  many 
  fossils 
  in 
  the 
  Sacramento 
  and 
  

   San 
  Andreas 
  mountains. 
  Near 
  Juniper 
  Tank 
  in 
  the 
  

   southern 
  Sacramento 
  Mountains 
  there 
  is 
  eleven 
  degrees 
  

   difference 
  in 
  dip 
  between 
  Magdalena 
  and 
  Abo 
  on 
  the 
  con- 
  

   tact 
  ; 
  the 
  basal 
  Abo 
  red 
  bed 
  here 
  has 
  silicified 
  tree 
  trunks 
  

   with 
  diameters 
  as 
  large 
  as 
  .three 
  feet 
  and 
  also 
  well- 
  

   rounded 
  pebbles 
  of 
  igneous 
  rocks. 
  In 
  the 
  lower 
  end 
  of 
  

   La 
  Luz 
  Canon, 
  east 
  of 
  Alamogordo, 
  the 
  lower 
  massive 
  

   cliff-forming 
  limestone 
  of 
  the 
  Magdalena 
  is 
  unconform- 
  

   ably 
  overlain 
  by 
  Abo 
  conglomerates, 
  shales, 
  limestones 
  

   and 
  sandstones. 
  The 
  conglomerates 
  contain 
  bowlders 
  of 
  

   Magdalena 
  limestone 
  in 
  sizes 
  up 
  to 
  two 
  feet. 
  The 
  basal 
  

   Abo 
  bed 
  here 
  contains 
  more 
  Fusulina 
  than 
  any 
  other 
  

   stratum 
  noted 
  in 
  eastern 
  New 
  Mexico. 
  

  

  