﻿74 
  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  The 
  Lower 
  Carboniferous 
  of 
  Newberry 
  represents 
  only 
  a 
  portion 
  of 
  

   the 
  " 
  Red 
  Wall" 
  group. 
  In 
  the 
  upper 
  portion 
  of 
  the 
  Aubrey 
  limestone 
  

   Mr. 
  Gilbert 
  found 
  fossils 
  suggesting 
  the 
  Permo-Carboniferous 
  of 
  the 
  Mis- 
  

   sissippi 
  Valley.* 
  In 
  the 
  Eeport 
  on 
  the 
  Invertebrate 
  Paleontology 
  of 
  the 
  

   Plateau 
  Province, 
  Dr. 
  0. 
  A. 
  White, 
  speaking 
  of 
  the 
  fossils 
  collected 
  by 
  

   Professor 
  Powell's 
  party 
  from 
  Carboniferous 
  rocks, 
  says 
  : 
  

  

  Few 
  or 
  none 
  of 
  the 
  fossils 
  of 
  the 
  collections 
  are 
  of 
  such 
  a 
  character 
  as 
  to 
  supfgest 
  the 
  Per- 
  

   mian 
  age 
  of 
  the 
  strata 
  from 
  which 
  they 
  were 
  obtained, 
  not 
  even 
  those 
  of 
  the 
  Upper 
  Aubrey 
  

   group. 
  I 
  have 
  elsewhere 
  shown 
  that 
  the 
  prevalence 
  of 
  certain 
  types 
  which 
  have 
  been 
  re- 
  

   lied 
  upon 
  to 
  prove 
  the 
  Permian 
  age 
  of 
  the 
  strata 
  containing 
  them 
  may 
  be 
  due 
  to 
  peculiar 
  

   physical 
  conditions, 
  and 
  I 
  therefore 
  regard 
  it 
  as 
  not 
  improbable 
  that 
  the 
  time 
  of 
  the 
  Permiaa 
  

   period 
  may 
  be 
  represented 
  in 
  the 
  Plateau 
  Province 
  by 
  the 
  Upper 
  Aubrey 
  group, 
  although 
  

   the 
  distinguishing 
  types 
  are 
  wanting 
  there. 
  

  

  Mr. 
  Gilbert 
  in 
  his 
  sections 
  t 
  has 
  a 
  series 
  of 
  Gypsiferous 
  beds 
  above 
  

   the 
  Aubrey 
  group, 
  which 
  he 
  refers 
  to 
  the 
  lower 
  part 
  of 
  the 
  Trias. 
  

  

  Under 
  the 
  head 
  of 
  the 
  Triassic 
  Dr. 
  jSTewberry, 
  speaking 
  of 
  the 
  Gyp- 
  

   siferous 
  series, 
  says|: 
  

  

  In 
  the 
  Pecos 
  section 
  the 
  red 
  sandstone 
  and 
  shales 
  rest 
  directly 
  upon 
  the 
  Coal-Measure 
  lime- 
  

   stones, 
  and 
  the 
  Permian 
  magnesian 
  rocks 
  of 
  Kansas 
  are 
  entirely 
  wanting. 
  It 
  is 
  possible, 
  

   however, 
  as 
  I 
  have 
  before 
  stated, 
  that 
  they 
  are 
  represented 
  by 
  the 
  extreme 
  upper 
  portion 
  of 
  

   the 
  Calcareous 
  beds, 
  and 
  by 
  apart 
  of 
  the 
  overlying 
  red 
  sandstones 
  and 
  shales 
  — 
  the 
  Salifer- 
  

   ous 
  group 
  of 
  my 
  former 
  report 
  ; 
  the 
  " 
  Burder 
  Sandstein," 
  or 
  lower 
  division 
  of 
  the 
  Trias 
  of 
  

   Marcou. 
  

  

  Speaking 
  of 
  the 
  fossils, 
  he 
  says 
  : 
  

  

  As 
  it 
  is 
  they 
  give 
  us 
  reason 
  to 
  suspect 
  that 
  the 
  lower 
  portion 
  of 
  the 
  Gypsum 
  series 
  should 
  

   be 
  regarded 
  as 
  of 
  Permian 
  age. 
  

  

  Again 
  he 
  says: 
  

  

  Those 
  fossils 
  which 
  I 
  obtained 
  are 
  insufficient 
  to 
  decide 
  any 
  of 
  the 
  questions 
  which 
  have 
  

   been 
  raised 
  in 
  regard 
  to 
  the 
  parallelism 
  of 
  the 
  beds 
  containing 
  them, 
  with 
  those 
  of 
  other 
  

   countries, 
  while 
  they 
  may 
  perhaps 
  justly 
  afford 
  ground 
  for 
  a 
  suspicion 
  that 
  the 
  classification 
  

   which 
  refers 
  all 
  the 
  Gypsum 
  formation 
  to 
  the 
  Trias 
  may 
  be 
  erroneous. 
  

  

  In 
  my 
  own 
  district 
  I 
  had 
  an 
  outcrop 
  of 
  the 
  Trias 
  resting 
  on 
  the 
  gran- 
  

   ite, 
  which 
  I 
  traced 
  continuously 
  for 
  twenty 
  miles. 
  Here 
  the 
  lower 
  part 
  

   of 
  the 
  Trias 
  consisted 
  of 
  shaly 
  sandstones, 
  red 
  and 
  brownish 
  in 
  color. 
  

   The 
  Gypsum 
  series 
  which 
  lies 
  beneath 
  farther 
  west 
  was 
  absent. 
  

  

  The 
  evidence 
  upon 
  which 
  I 
  refer 
  the 
  Gypsum 
  series 
  to 
  the 
  Permian 
  

   or 
  Permo-Carboniferous 
  is 
  as 
  follows 
  : 
  

  

  1st. 
  The 
  existence 
  of 
  the 
  series 
  has 
  been 
  proved 
  at 
  widely- 
  separated 
  

   localities 
  in 
  the 
  West, 
  and 
  has 
  been 
  so 
  referred. 
  

  

  2d. 
  The 
  upper 
  part 
  of 
  the 
  Aubrey 
  group 
  in 
  the 
  region 
  of 
  the 
  Col- 
  

   orado 
  River 
  has 
  no 
  Permian 
  fossils, 
  although 
  some 
  of 
  them 
  suggest 
  the 
  

   Permo-Carboniferous. 
  

  

  3d. 
  Vegetable 
  impressions 
  from 
  the 
  lower 
  part 
  of 
  the 
  red 
  beds, 
  

   found 
  by 
  Professor 
  Newberry 
  in 
  New 
  Mexico, 
  gave 
  him 
  reason 
  to 
  sus- 
  

   pect 
  the 
  Permian 
  age 
  of 
  the 
  lower 
  part 
  of 
  the 
  gypsum 
  series. 
  

  

  4th. 
  On 
  Eagle 
  River, 
  at 
  the 
  base 
  of 
  the 
  series, 
  I 
  found 
  fossils 
  referred 
  

   by 
  Professor 
  Lesquereux 
  to 
  the 
  Permian. 
  Professor 
  Stevenson 
  also 
  

   refers 
  the 
  same 
  beds 
  to 
  the 
  Carboniferous. 
  

  

  5th. 
  During 
  the 
  season 
  of 
  1874, 
  I 
  found 
  the 
  red 
  beds 
  resting 
  upon 
  

   the 
  granite 
  without 
  the 
  gyi)sum 
  series 
  between, 
  while 
  farther 
  west 
  

   it 
  was 
  iDresent 
  beneath 
  the 
  red 
  beds, 
  with 
  undoubted 
  Carboniferous 
  

   strata 
  below 
  it. 
  

  

  I 
  have 
  called 
  them 
  Permo-Carboniferous 
  because 
  there 
  seems 
  to 
  be 
  a 
  

  

  * 
  Geology 
  of 
  Eastern 
  part 
  of 
  the 
  Uinta 
  Mountains, 
  p. 
  80. 
  

  

  t 
  Rept. 
  Geograph. 
  and 
  Geol. 
  Expl. 
  W. 
  of 
  100th 
  Meridian, 
  pp. 
  160, 
  161, 
  «fcc. 
  

  

  t 
  Expl. 
  Exped. 
  to 
  Junction 
  of 
  Grand 
  and 
  Green, 
  pp. 
  48, 
  49. 
  

  

  