﻿78 
  

  

  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  The 
  following 
  table 
  of 
  Carboniferous 
  strata 
  is 
  given 
  for 
  comparison 
  

   with, 
  the 
  preceding 
  : 
  

  

  Montana— 
  Hayden. 
  * 
  

  

  Wind 
  Eiver 
  Mount- 
  

   ains 
  — 
  Comstock. 
  t 
  

  

  Plat 
  

  

  eau 
  province 
  — 
  Powell, 
  t 
  

  

  Interior 
  basin 
  of 
  United 
  States 
  

   — 
  Missouri, 
  Iowa, 
  and 
  Illi- 
  

   nois. 
  § 
  

  

  Limestones, 
  both 
  in 
  

  

  Arenaceous 
  and 
  cal- 
  

  

  

  

  "3 
  

  

  o 
  

  

  

  the 
  Subcarbonifer- 
  

  

  careous 
  beds 
  with 
  

  

  » 
  

  

  Sandstones 
  and 
  lime- 
  

  

  

  ous 
  and 
  Carbonifer- 
  

  

  limestone 
  at 
  the 
  

  

  =S 
  

  

  stones, 
  the 
  latter 
  

  

  o 
  

  

  

  ous. 
  The 
  line 
  sepa- 
  

  

  base. 
  

  

  o 
  

   o 
  

  

  cherty. 
  To 
  the 
  

  

  5 
  o 
  

  

  Generally 
  limestones 
  

  

  rating 
  them 
  cannot 
  

  

  Limestones 
  compact, 
  

  

  o_ 
  

  

  north 
  there 
  are 
  two 
  

  

  £S 
  

  

  with 
  few 
  shales 
  and 
  

  

  be 
  defined. 
  

  

  thickly 
  bedded, 
  

  

  _ 
  

  

  memb 
  e 
  r 
  s 
  of 
  this 
  

  

  =§ 
  P 
  

  

  sandstones. 
  Thick- 
  

  

  Permian 
  beds 
  have 
  

  

  Subcarboniferous. 
  

  

  ^ 
  

  

  group, 
  viz, 
  Bellero- 
  

  

  Is 
  

  

  ness, 
  530 
  to 
  1,250 
  feet. 
  

  

  not 
  been 
  recognized. 
  

  

  Thickness 
  of 
  Carbo- 
  

  

  t. 
  

  

  plion 
  limestone, 
  and 
  

  

  

  

  niferous 
  limestones 
  , 
  

  

  s 
  

  

  Yampa 
  .sandsto?ie. 
  

  

  

  

  

  equivalent 
  of 
  Up- 
  

  

  < 
  

  

  Farther 
  south 
  cherty 
  

  

  o 
  

  

  

  

  per 
  Coal-Measures 
  

  

  c 
  

  

  limestones 
  prevail. 
  

  

  

  

  

  of 
  the 
  eastern 
  Uni- 
  

  

  £" 
  

  

  

  02 
  

  

  

  

  ted 
  States, 
  not 
  less 
  

  

  p 
  

  

  

  P 
  

  

  

  

  than 
  2, 
  000 
  feet. 
  

  

  

  

  2 
  

  

  Limestones 
  with 
  shales 
  

  

  

  

  >^ 
  

  

  

  S3 
  

  

  and 
  sandstone 
  at 
  the 
  

  

  

  

  

  Sandstones 
  and 
  lime- 
  

  

  3 
  

  

  base. 
  Thickness, 
  600 
  

  

  

  

  II 
  

  

  stones 
  massively 
  

  

  -s 
  

  

  to 
  2,500 
  feet. 
  

  

  

  

  <!* 
  

  

  bedded. 
  I 
  n 
  some 
  

  

  5? 
  

  

  

  

  

  o 
  

  

  localities 
  sandstones 
  

  

  s 
  

  

  

  

  

  S§ 
  

  

  prevail 
  and 
  are 
  fria- 
  

  

  

  

  

  o 
  

  

  ble. 
  

  

  Chiefly 
  limestones. 
  In 
  

   the 
  Uintah 
  Mount- 
  

  

  

  

  

  

  o 
  

  

  tains 
  massive 
  lime- 
  

  

  

  

  

  

  =s 
  

  

  stones 
  are 
  separated 
  

  

  

  

  

  

  o 
  

   o 
  

  

  by 
  thin 
  strata 
  of 
  

  

  

  

  

  

  o 
  

  

  sandstones. 
  lu 
  the 
  

  

  

  

  

  

  cf 
  

  

  Grand 
  CaSon 
  a 
  mass- 
  

  

  

  

  

  

  

  iv 
  e 
  lime 
  St 
  on 
  e, 
  a 
  

  

  

  

  

  

  thous 
  and 
  feet 
  in 
  

  

  

  

  

  

  thickness, 
  is 
  found 
  

  

  

  

  

  

  s 
  

  

  with 
  thinner 
  strata 
  

  

  

  

  

  

  « 
  

  

  of 
  limestone 
  and 
  

   sandstone 
  beneath. 
  

  

  

  

  

  

  o 
  

  

  Sandstones 
  and 
  shales, 
  

  

  

  

  

  

  -* 
  

  

  supposed 
  to 
  be 
  the 
  

  

  

  

  

  

  gT"© 
  

  

  equivalent 
  in 
  the 
  

  

  

  

  

  

  o 
  ^ 
  

  

  Uintah 
  Mountains 
  to 
  

  

  

  

  

  

  

  the 
  Tonto 
  group 
  in 
  

  

  

  

  

  

  . 
  tJ 
  

  

  the 
  Grand 
  Canon. 
  

  

  

  

  Total 
  thickness, 
  1,000 
  

  

  

  Total 
  thickness, 
  4,460 
  feet. 
  

  

  Total 
  thickness, 
  1,130 
  to 
  3,750 
  

  

  to 
  3,000 
  feet. 
  

  

  

  

  

  feet. 
  

  

  

  ♦Keports 
  United 
  States 
  Geological 
  Survey 
  1871, 
  1872. 
  

   t 
  Reconnaissance 
  of 
  Northwestern 
  Wyoming, 
  by 
  Captain 
  Jones, 
  

   t 
  Geology 
  of 
  the 
  Eastern 
  Portion 
  of 
  the 
  Uintah 
  Mountains. 
  

   § 
  Dana's 
  Manual 
  of 
  Geology. 
  

  

  Comparing 
  the 
  tables 
  just 
  given 
  we 
  find 
  that 
  during 
  Subcarboniferous 
  

   times 
  there 
  was 
  a 
  period 
  of 
  limestone-making 
  which 
  was 
  pretty 
  general 
  

   over 
  the 
  west, 
  more 
  marked 
  towards 
  the 
  north, 
  in 
  Montana 
  and 
  Wy- 
  

   oming 
  Territories, 
  and 
  in 
  the 
  Mississippi 
  Valley. 
  Deep 
  seas 
  seem 
  to 
  have 
  

   prevailed, 
  with 
  laud 
  somewhere 
  in 
  Colorado, 
  probably 
  as 
  islands. 
  

   Thus 
  we 
  have 
  seen 
  that 
  a 
  portion 
  of 
  the 
  Sawatch 
  Eange, 
  and 
  perhaps 
  

   a 
  portion 
  of 
  the 
  Front 
  Eange, 
  and 
  a 
  considerable 
  area 
  in 
  the 
  western 
  

   part 
  of 
  our 
  district 
  must 
  have 
  been 
  above 
  the 
  level 
  of 
  the 
  sea. 
  

  

  In 
  the 
  succeeding 
  period 
  limestones 
  continued 
  in 
  the 
  Mississippi 
  Val- 
  

   ley 
  and 
  in 
  Montana, 
  and 
  also 
  in 
  the 
  plateau 
  region 
  bordering 
  the 
  Col- 
  

   orado 
  Eiver. 
  In 
  Colorado 
  the 
  rocks 
  show 
  that 
  numerous 
  oscillations 
  

   took 
  place, 
  and 
  that, 
  as 
  the 
  time 
  advanced, 
  they 
  became 
  less 
  and 
  less, 
  

   and 
  shallow 
  seas 
  prevailed, 
  with 
  considerable 
  areas 
  above 
  sea-level, 
  in 
  

   which 
  the 
  rocks, 
  judging 
  from 
  the 
  character 
  of 
  the 
  sandstones 
  then 
  

   formed, 
  were 
  mainly 
  Archaean. 
  

  

  