﻿S. 
  Powers— 
  The 
  Butler 
  Salt 
  Dome. 
  139 
  

  

  Blossom 
  sand 
  producing 
  the 
  oil 
  of 
  the 
  Homer 
  gushers 
  

   and 
  of 
  the 
  Shelby 
  County 
  wells; 
  and 
  the 
  Austin 
  chalk 
  

   producing 
  the 
  heavy 
  oil 
  of 
  the 
  Mission 
  and 
  Alta 
  Vista 
  

   fields, 
  Texas. 
  Indication 
  that 
  these 
  horizons 
  will 
  be 
  pro- 
  

   ductive 
  in 
  the 
  east 
  Texas 
  synclinorium 
  is 
  thus 
  far 
  lacking. 
  

  

  Origin 
  of 
  the 
  Dome. 
  

  

  Each 
  of 
  the 
  interior 
  domes 
  in 
  which 
  Cretaceous 
  sedi- 
  

   ments 
  are 
  exposed 
  affords 
  some 
  evidence 
  as 
  to 
  the 
  

   periods 
  at 
  which 
  these 
  domes 
  were 
  uplifted. 
  In 
  the 
  

   Butler 
  dome 
  the 
  presence 
  of 
  shales 
  which 
  are 
  probably 
  

   of 
  Midway 
  age 
  forms 
  a 
  marked 
  contrast 
  to 
  conditions 
  in 
  

   the 
  Palestine, 
  Keechi, 
  and 
  Brooks 
  domes, 
  where 
  no 
  

   strata 
  of 
  Midway 
  age 
  have 
  been 
  found. 
  Also 
  in 
  the 
  But- 
  

   ler 
  dome 
  hard 
  sandstones, 
  the 
  age 
  of 
  which 
  appears 
  to 
  be 
  

   Mount 
  Selman, 
  are 
  found 
  nearer 
  to 
  the 
  dome 
  than 
  in 
  any 
  

   other 
  except 
  the 
  Steen 
  dome. 
  If 
  these 
  two 
  age 
  interpre- 
  

   tations 
  are 
  correct 
  the 
  first 
  clearly 
  established 
  uplift 
  and 
  

   the 
  maximum 
  period 
  of 
  uplift 
  of 
  the 
  Butler 
  dome 
  was 
  

   toward 
  the 
  close 
  of 
  the 
  deposition 
  of 
  the 
  Wilcox 
  forma- 
  

   tion. 
  But 
  this 
  uplift 
  must 
  have 
  been 
  gradual 
  as 
  no 
  dif- 
  

   ference 
  between 
  the 
  Mount 
  Selman 
  sediments 
  near 
  the 
  

   dome 
  and 
  elsewhere 
  can 
  be 
  seen. 
  It 
  is 
  quite 
  possible 
  

   that 
  there 
  is 
  a 
  hiatus 
  at 
  the 
  base 
  of 
  the 
  Wilcox 
  because 
  

   the 
  normal 
  thickness 
  of 
  sandy 
  shales 
  in 
  the 
  basal 
  portion 
  

   of 
  this 
  formation 
  is 
  not 
  in 
  evidence. 
  Uplift 
  has 
  also 
  

   taken 
  place 
  since 
  the 
  deposition 
  of 
  the 
  Mount 
  Selman 
  

   formation. 
  

  

  Stream 
  adjustment 
  has 
  been 
  called 
  upon 
  to 
  prove 
  re- 
  

   cent 
  uplift 
  of 
  the 
  interior 
  domes 
  but 
  this 
  adjustment 
  

   over 
  the 
  relatively 
  small 
  areas 
  covered 
  by 
  the 
  domes 
  is 
  

   certainly 
  antecedent 
  to 
  the 
  latest 
  stream 
  rejuvenation. 
  

   The 
  adjustment 
  must 
  date 
  from 
  the 
  period 
  of 
  dissection 
  

   following 
  the 
  uplift 
  of 
  the 
  peneplain, 
  probably 
  during 
  

   the 
  Miocene, 
  and 
  subsequent 
  to 
  the 
  deposition 
  of 
  the 
  

   widespread 
  peneplain 
  gravels 
  (Lissie 
  gravels, 
  Uvalde 
  

   gravels, 
  Reynosa 
  formation) 
  derived 
  from 
  the 
  Ouachita, 
  

   Arbuckle, 
  Wichita, 
  and 
  Marathon 
  mountains. 
  

  

  From 
  the 
  stratigraphic 
  conditions 
  in 
  the 
  Palestine 
  and 
  

   Keechi 
  domes 
  Hopkins 
  concluded 
  that 
  the 
  east 
  Texas 
  

   domes 
  were 
  probably 
  first 
  uplifted 
  before 
  the 
  deposition 
  

   of 
  the 
  Midway 
  and 
  the 
  main 
  period 
  of 
  uplift 
  was 
  subse- 
  

   quent 
  to 
  the 
  deposition 
  of 
  the 
  Mount 
  Selman 
  formation. 
  

  

  