﻿120 
  

  

  R. 
  T. 
  Hill 
  — 
  Reconnaissance 
  of 
  the 
  

  

  Fe 
  road 
  is 
  a 
  smaller 
  but 
  similar 
  and 
  parallel 
  ridge 
  of 
  folded 
  

   Silurian 
  rocks 
  extending 
  westward 
  to 
  Healdton 
  (see 
  map). 
  

   For 
  these 
  mountains 
  there 
  is 
  no 
  local 
  name, 
  and 
  I 
  have 
  called 
  

   them 
  Red 
  Bird 
  from 
  an 
  adjacent 
  post-office. 
  They 
  serve 
  to 
  

   prove 
  the 
  great 
  width 
  of 
  the 
  folded 
  belt. 
  

  

  CcLrbaru&rous 
  

  

  Section 
  across 
  Indian 
  Territory 
  from 
  south 
  to 
  north 
  along 
  Atchison, 
  Topeka 
  

   and 
  Santa 
  Fe 
  Railway. 
  

  

  The 
  accompanying 
  north 
  and 
  south 
  section 
  and 
  profile 
  from 
  

   Gainsville, 
  Texas, 
  to 
  Guthrie, 
  Oklahoma, 
  gives 
  at 
  least 
  an 
  idea 
  

   of 
  the 
  sequence 
  and 
  foldings 
  of 
  the 
  Arbuckle 
  region. 
  Pro- 
  

   ceeding 
  southward 
  along 
  the 
  line 
  of 
  the 
  Atchison, 
  Topeka 
  and 
  

   Santa 
  Fe, 
  the 
  typical 
  gypsiferous 
  red 
  beds 
  of 
  Texas, 
  Kansas, 
  

   Indian 
  Territory 
  and 
  New 
  Mexico 
  — 
  the 
  alleged 
  Triassic* 
  — 
  are 
  

   seen 
  from 
  Guthrie 
  to 
  Oklahoma 
  City, 
  lying 
  in 
  a 
  disturbed, 
  but 
  

   comparatively 
  sub-horizontal 
  position, 
  showing 
  greater 
  dips 
  

   than 
  the 
  Cretaceous, 
  but 
  none 
  of 
  the 
  complicated 
  folding 
  of 
  

   the 
  Paleozoic 
  strata. 
  South 
  of 
  the 
  Canadian, 
  the 
  Carboniferous 
  

   clays 
  and 
  sandstones 
  appear 
  with 
  the 
  excessive 
  dips 
  of 
  the 
  

   Ouachita 
  folds. 
  At 
  Buckhorn 
  Creek, 
  east 
  of 
  Dougherty, 
  the 
  

   coal-bearing 
  beds 
  of 
  the 
  Carboniferous 
  are 
  seen 
  dipping 
  north 
  

   at 
  an 
  angle 
  of 
  65°, 
  and 
  involved 
  in 
  the 
  folds 
  of 
  the 
  adjacent 
  

   limestone 
  hills. 
  In 
  this 
  vicinity 
  there 
  are 
  terranes 
  at 
  the 
  base 
  

   of 
  the 
  Carboniferous, 
  the 
  age 
  of 
  which 
  I 
  could 
  not 
  determine, 
  

   especially 
  a 
  great 
  thickness 
  of 
  soft 
  sandstone, 
  but 
  the 
  succeed- 
  

   ing 
  limestones 
  are 
  undoubtedly 
  a 
  part 
  of 
  the 
  Silurian 
  system 
  

   as 
  determined 
  for 
  me 
  from 
  fossils 
  by 
  Professor 
  Henry 
  S. 
  

   Williams. 
  

  

  Proceeding 
  southward 
  from 
  Dougherty 
  to 
  Berwin 
  the 
  lime- 
  

   stones, 
  shales 
  and 
  sandstones 
  of 
  the 
  pre-Carboniferous 
  succeed 
  

   each 
  other, 
  but 
  so 
  complicated 
  is 
  the 
  vertical 
  folding, 
  that 
  the 
  

   writer 
  must 
  confess 
  his 
  utter 
  inability 
  to 
  determine 
  their 
  pro- 
  

   per 
  succession, 
  even 
  after 
  considerable 
  study. 
  These 
  rocks 
  

   occupy 
  in 
  cross-section, 
  almost 
  invariably 
  a 
  sub-perpendicular 
  

  

  * 
  The 
  basal 
  portion 
  of 
  these 
  Red 
  Beds 
  is 
  of 
  Permian 
  age 
  as 
  shown 
  in 
  their 
  

   Texas 
  continuation 
  by 
  Boll, 
  Cope 
  and 
  White. 
  See 
  American 
  Naturalist, 
  June 
  

   1879, 
  September 
  1880. 
  

  

  