﻿Blaekwelder 
  — 
  Little 
  known 
  Paleozoic 
  Faunas. 
  179 
  

  

  Composita 
  sabtilita 
  Euphemus 
  ? 
  sp. 
  

  

  Hustedia 
  ineekana 
  Patellostium 
  ? 
  sp. 
  

  

  Acanthopecten 
  coloradoensis 
  Pleurotomaria 
  sp. 
  

  

  Avicidopecte?i 
  cor 
  ey 
  anus 
  ? 
  Pseudomelania 
  ? 
  sp. 
  

  

  Amcidopecten 
  aff. 
  whitei 
  Enchostoma 
  sp. 
  

  

  Aviculopecten 
  sp. 
  JVautilus? 
  sp. 
  

  

  Pseudomonotis 
  n. 
  sp. 
  Fish 
  remains 
  

  

  Girty 
  has 
  already 
  shown* 
  that 
  the 
  Embar 
  formation, 
  as 
  

   limited 
  by 
  Darton, 
  contains 
  two 
  quite 
  distinct 
  faunas. 
  Of 
  

   these 
  the 
  hitherto 
  better 
  known 
  is 
  found 
  in 
  the 
  upper 
  half 
  of 
  

   the 
  formation, 
  and 
  consists 
  of 
  large 
  numbers 
  of 
  Lingulas 
  and 
  

   pelecypods, 
  representing, 
  however, 
  only 
  a 
  few 
  species, 
  and 
  

   even 
  those 
  seldom 
  identiliable 
  with 
  confidence. 
  The 
  lower 
  

   fauna, 
  which 
  is 
  the 
  subject 
  of 
  this 
  note, 
  may 
  well 
  be 
  known 
  as 
  

   the 
  Spiriferina 
  pulchra 
  fauna, 
  after 
  one 
  of 
  its 
  most 
  easily 
  

   recognized 
  and 
  most 
  widespread 
  brachiopods. 
  This 
  fauna, 
  in 
  

   greatly 
  impoverished 
  state, 
  occurs 
  near 
  Thermopolis 
  and 
  is 
  

   known 
  also 
  from 
  the 
  Phosphoria 
  formation 
  of 
  western 
  Wyo- 
  

   ming 
  and 
  southeastern 
  Idaho. 
  

  

  Of 
  this 
  lower 
  Embar 
  fauna, 
  Girty 
  says, 
  u 
  the 
  age 
  of 
  the 
  

   Spiriferina 
  ptdchra 
  fauna 
  is 
  probably 
  Permian. 
  This 
  is 
  sug- 
  

   gested 
  by 
  such 
  Permian 
  types 
  as 
  Phyllopora 
  and 
  Atdosteges, 
  

   together 
  with 
  the 
  peculiar 
  character 
  of 
  other 
  species 
  when 
  

   compared 
  with 
  congeneric 
  types 
  in 
  other 
  western 
  Pennsylva- 
  

   nian 
  faunas." 
  

  

  There 
  is 
  little 
  in 
  common, 
  however, 
  between 
  the 
  Spiriferina 
  

   ptdchra 
  fauna 
  and 
  that 
  of 
  the 
  Guadaloupe 
  group 
  of 
  Texas, 
  or 
  

   of 
  the 
  beds 
  commonly 
  referred 
  to 
  the 
  Permian 
  in 
  Kansas. 
  

   There 
  are 
  some 
  things 
  about 
  it 
  suggestive 
  of 
  the 
  fossils 
  which 
  

   have 
  been 
  described 
  from 
  the 
  Productus 
  limestone 
  of 
  the 
  Salt 
  

   Range 
  in 
  India 
  and 
  from 
  the 
  Schwagerina 
  limestone 
  of 
  the 
  

   Ural 
  Mountains 
  in 
  Russia. 
  The 
  former 
  of 
  these 
  has 
  generally 
  

   been 
  considered 
  Permian 
  and 
  the 
  latter 
  upper 
  Pennsylvanian. 
  

   It 
  is 
  evident 
  that 
  the 
  whole 
  subject 
  of 
  correlation 
  of 
  the 
  latest 
  

   Paleozoic 
  formations 
  the 
  world 
  over 
  is 
  in 
  a 
  most 
  unsatisfactory 
  

   and 
  unsettled 
  state. 
  

  

  Madison, 
  Wise, 
  March 
  25, 
  1913. 
  

  

  * 
  See 
  paper 
  by 
  Woodruff, 
  noted 
  above, 
  p. 
  13. 
  

  

  