﻿196 
  S. 
  Wetter 
  — 
  Succession 
  of 
  Fossil 
  Faunas 
  in 
  Missouri. 
  

  

  similarity 
  of 
  the 
  environments 
  during 
  deposition. 
  In 
  Indiana 
  

   these 
  conditions 
  were 
  present 
  at 
  the 
  beginning 
  of 
  the 
  St. 
  Louis 
  

   period, 
  but 
  in 
  Southwest 
  Missouri 
  this 
  diminutive 
  fauna 
  is 
  fol- 
  

   lowed 
  by 
  a 
  good 
  Keokuk 
  fauna. 
  

  

  Zone 
  XII. 
  — 
  Above 
  the 
  stylolite 
  band 
  at 
  Station 
  11, 
  the 
  first 
  

   three 
  feet 
  are 
  nearly 
  barren 
  of 
  fossils, 
  the 
  only 
  species 
  seen 
  

   being 
  Orthis 
  dubia. 
  Above 
  this 
  however, 
  in 
  the 
  somewhat 
  

   weathered 
  limestone, 
  fossils 
  are 
  very 
  abundant. 
  The 
  species 
  

   collected 
  are 
  as 
  follows 
  : 
  

  

  Chonetes 
  illinoisensis 
  Worthen. 
  

   Derbyia 
  keokuk 
  Hall. 
  

   Orthis 
  dubia 
  Hall. 
  

   Athyris 
  incrassatus 
  Hall. 
  

   Spirifer 
  keokuk 
  Hall. 
  

   Spirifer 
  suborbicularis 
  Hall. 
  

  

  Phillipsia 
  bufo 
  Meek 
  and 
  Worthen. 
  

   Spiriferina 
  sp. 
  

  

  Productus 
  punctatus 
  Martin. 
  

   Productus 
  cora 
  D'Orbigny. 
  

   Spirifer 
  tenuicostatus 
  Hall. 
  

   Zaphrentis 
  centralis 
  Worthen. 
  

  

  This 
  fauna 
  as 
  a 
  whole 
  is 
  Keokuk. 
  The 
  most 
  interesting 
  

   species 
  is 
  Chonetes 
  illinoisensis, 
  which 
  was 
  very 
  abundant 
  

   through 
  the 
  lower 
  zones 
  and 
  then 
  disappeared 
  entirely. 
  When 
  

   it 
  first 
  reappeared 
  it 
  was 
  quite 
  rare, 
  but 
  in 
  the 
  present 
  fauna 
  it 
  

   takes 
  its 
  place 
  as 
  the 
  most 
  abundant 
  species. 
  Specimens 
  from 
  

   the 
  lower 
  and 
  upper 
  zones 
  are 
  absolutely 
  alike. 
  

  

  list 
  of 
  Stations. 
  

  

  1. 
  Jones 
  Spring, 
  on 
  Gulf 
  B. 
  R. 
  4 
  miles 
  S. 
  E. 
  of 
  Springfield. 
  

  

  2. 
  Railroad 
  cut 
  just 
  west 
  of 
  Station 
  1. 
  

  

  3. 
  Railroad 
  cut 
  \ 
  mile 
  N. 
  W. 
  of 
  Station 
  2. 
  

  

  4. 
  Quarry 
  on 
  Gulf 
  R. 
  R., 
  east 
  of 
  Springfield 
  Car 
  and 
  Foundry 
  

  

  Co. 
  

  

  5. 
  Quarry 
  at 
  crossing 
  of 
  Gulf 
  and 
  Frisco 
  railroads. 
  

  

  6. 
  Excavation 
  for 
  gas. 
  receiver, 
  corner 
  of 
  Main 
  St. 
  and 
  Wilson 
  

  

  Creek, 
  Springfield. 
  

  

  7. 
  Quarry 
  at 
  old 
  brewery, 
  near 
  Gulf 
  R. 
  R. 
  shops. 
  

  

  8. 
  Quarry 
  on 
  east 
  side 
  of 
  Wilson 
  Creek 
  and 
  south 
  of 
  Mt. 
  Vernon 
  

  

  road. 
  

  

  9. 
  Quarry 
  on 
  opposite 
  side 
  of 
  creek 
  from 
  Station 
  8. 
  

  

  10. 
  Ledge 
  of 
  oolitic 
  limestone, 
  \ 
  mile 
  south 
  of 
  Station 
  9. 
  

  

  11. 
  Mackey's 
  quarry, 
  \\ 
  miles 
  S. 
  W. 
  of 
  Springfield. 
  

  

  12. 
  Quarry 
  on 
  N. 
  Washington 
  Ave., 
  near 
  the 
  large 
  spring. 
  

  

  13. 
  Quarry 
  \ 
  mile 
  N. 
  E. 
  from 
  Station 
  12. 
  

  

  14. 
  Quarry 
  \ 
  mile 
  north 
  from 
  Station 
  12. 
  

  

  15. 
  Sink 
  hole 
  in 
  N. 
  W. 
  J, 
  N. 
  W. 
  ±, 
  Sec. 
  8. 
  T. 
  28, 
  R. 
  22. 
  

  

  16. 
  Railroad 
  cut 
  on 
  Boliver 
  R. 
  R. 
  at 
  Ritter's 
  Station. 
  

  

  17. 
  Near 
  Pierson 
  Creek, 
  S. 
  W. 
  ±, 
  S. 
  W. 
  i, 
  Sec. 
  14. 
  T. 
  29, 
  R. 
  21. 
  

  

  1 
  8. 
  Quarry 
  at 
  Valley 
  Water 
  Mills 
  on 
  Sac 
  Creek, 
  4 
  miles 
  N. 
  E. 
  

  

  of 
  Springfield. 
  

  

  19. 
  Quarry 
  at 
  Edward's 
  Spring, 
  near 
  the 
  N. 
  W. 
  corner 
  of 
  Sec. 
  6, 
  

  

  T. 
  28, 
  R. 
  21. 
  

  

  20. 
  Ledge 
  along 
  Sac 
  Creek, 
  just 
  north 
  of 
  Station 
  19. 
  

  

  21. 
  Spout 
  Spring, 
  on 
  Sac 
  Creek 
  N. 
  E. 
  of 
  Springfield. 
  

  

  