﻿72 
  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  Feet. 
  

  

  3. 
  Slaty 
  blue 
  argillaceous 
  limestone, 
  somewhat 
  cherty, 
  crowded 
  

   with 
  fossils, 
  amoDg 
  which 
  are 
  Atkyris 
  subtilita, 
  Spirifer 
  earner- 
  

   atiis, 
  Froductus 
  semireticulatus, 
  P. 
  scabriculus, 
  P. 
  Bogersi, 
  P. 
  

   punctatus, 
  P. 
  nodosus, 
  Orthisina 
  titnhraculum, 
  Myalina 
  ampla, 
  

   Pleurotomaria 
  excelsa, 
  &g 
  40 
  

  

  4. 
  Eed 
  shale, 
  no 
  fossils 
  

  

  5. 
  Bluish- 
  white 
  or 
  red 
  mottled 
  sandy 
  limestones, 
  no 
  fossils 
  35 
  

  

  6. 
  Eed 
  calcareous 
  shale, 
  no 
  fossils 
  7 
  

  

  7. 
  Eed 
  or 
  bluish-white 
  mottled 
  sandy 
  limestone 
  j 
  massive; 
  no 
  

   fossils 
  25 
  

  

  8. 
  Coarse 
  blood-red 
  sandstone, 
  in 
  some 
  localities 
  becoming 
  red 
  

   shale 
  ; 
  no 
  fossils 
  , 
  22 
  

  

  9. 
  Hard 
  cherty 
  blue 
  limestone, 
  with 
  a 
  few 
  fossils 
  of 
  the 
  same 
  spe- 
  

   cies 
  as 
  found 
  in 
  No. 
  3 
  36 
  

  

  241 
  

   On 
  Grand 
  Eiver 
  he 
  gives 
  substantially 
  tbe 
  same 
  section, 
  adding 
  

   to 
  it 
  " 
  alternations 
  of 
  blue 
  limestone, 
  red 
  and 
  gray 
  sandstone 
  

   to 
  bottom 
  of 
  caiion" 
  1, 
  OOO 
  

  

  Making 
  a 
  total 
  of 
  , 
  1, 
  241 
  

  

  The 
  locality 
  of 
  this 
  section 
  is 
  about 
  40 
  miles 
  west 
  of 
  that 
  of 
  my 
  sec- 
  

   tion 
  on 
  Salt 
  Creek. 
  It 
  is 
  west 
  of 
  the 
  Sierra 
  la 
  Sal. 
  On 
  Salt 
  Creek 
  

   tbe 
  beds 
  appear 
  to 
  be 
  more 
  shaly 
  in 
  character, 
  and 
  they 
  were 
  undoubt- 
  

   edly 
  formed 
  near 
  a 
  shore-line, 
  for, 
  only 
  8 
  or 
  10 
  miles 
  east 
  they 
  do 
  not 
  

   appear, 
  the 
  higher 
  beds 
  resting 
  immediately 
  on 
  the 
  granite. 
  On 
  account 
  

   of 
  these 
  differences 
  it 
  is 
  difS^cuit 
  to 
  correlate 
  the 
  two 
  sections. 
  I 
  think, 
  

   however, 
  that 
  the 
  equivalents 
  of 
  the 
  limestones 
  (Nos. 
  1, 
  2, 
  and 
  3 
  of 
  j 
  

   Newberry's 
  section) 
  occur 
  somewhere 
  in 
  the 
  upper 
  part 
  of 
  No. 
  3 
  of 
  my 
  

   Salt 
  Creek 
  section. 
  

  

  Professor 
  Newberry 
  was 
  unable 
  to 
  correlate 
  the 
  Grand 
  Elver 
  section 
  

   with 
  that 
  of 
  the 
  Colorado 
  Eiver 
  made 
  by 
  him 
  when 
  with 
  Lieutenant 
  

   Ives. 
  

  

  What 
  relations 
  my 
  section 
  bears 
  to 
  those 
  of 
  Mr. 
  Gilbert 
  and 
  Professor 
  

   Powell 
  in 
  the 
  Colorado 
  Plateau 
  region 
  I 
  am 
  unable 
  to 
  say. 
  In 
  the 
  lat- 
  

   ter 
  region 
  limestones 
  are 
  more 
  abundant, 
  deeper 
  seas 
  seeming 
  to 
  have 
  

   prevailed 
  from 
  Subcarboniferous 
  to 
  Permian 
  times. 
  

  

  Beds 
  Nos. 
  1 
  and 
  2 
  of 
  the 
  section 
  of 
  Salt 
  Creek 
  I 
  am 
  inclined 
  to 
  call 
  

   Permian 
  or 
  Permo-Carbouiferous. 
  Their 
  thickness 
  is 
  about 
  1,000 
  feet. 
  

   The 
  beds 
  are 
  gypsiferous 
  and 
  shaly. 
  It 
  is 
  difficult 
  to 
  draw 
  any 
  line 
  sep- 
  

   arating 
  theUpper 
  Carboniferous 
  from 
  the 
  Trias, 
  the 
  pink 
  shales 
  grading 
  

   into 
  the 
  blood-red 
  sandstones, 
  and 
  shales 
  resting 
  upon 
  them. 
  It 
  seems 
  

   possible 
  that 
  a 
  portion 
  of 
  the 
  beds 
  I 
  have 
  referred 
  to 
  the 
  Upper 
  Carbon 
  

   iferous 
  are 
  represented 
  by 
  a 
  portion 
  of 
  the 
  Shinarump 
  group 
  of 
  Powell'/ 
  

   section.* 
  The 
  data 
  upon 
  which 
  I 
  first 
  referred 
  the 
  gypsiferous 
  series, 
  ioj' 
  

   mediately 
  underlying 
  the 
  " 
  red 
  beds" 
  to 
  the 
  Upper 
  Carboniferous, 
  calling/ 
  

   Permo-Carboniferous, 
  are 
  fully 
  detailed 
  in 
  the 
  reports 
  for 
  1873 
  and 
  187/. 
  

  

  Dr. 
  Hayden 
  referred 
  a 
  set 
  of 
  beds 
  in 
  the 
  Black 
  Hills 
  to 
  the 
  Permia, 
  

   and 
  he 
  and 
  Meek 
  identified 
  the 
  horizon 
  in 
  Kansas. 
  Professor 
  Newbe/y 
  

   has 
  also 
  recognized 
  the 
  forpaation 
  in 
  Kansas 
  on 
  Dragoon 
  Creek, 
  ^^h 
  

   beds 
  below 
  in 
  which 
  there 
  is 
  a 
  mingling 
  of 
  Permian 
  and 
  Carboniferus 
  

   forms.t 
  I 
  

  

  * 
  Geology 
  of 
  the 
  Unita 
  Mountains, 
  pp. 
  41, 
  53, 
  54. 
  

  

  t 
  Report 
  Exploring 
  Expedition 
  to 
  Junction 
  of 
  Grand 
  and 
  Green, 
  p. 
  19. 
  

  

  