﻿188 
  S. 
  Welter 
  — 
  Succession 
  of 
  Fossil 
  Faunas 
  in 
  Missouri. 
  

  

  Chonetes 
  illinoisensis 
  Worth 
  en. 
  

   Spirifer 
  biplicatus 
  Hall. 
  

   Syringothyris 
  carteri 
  Hall. 
  

   Spirifer 
  sub 
  orbicularis 
  Hall. 
  

   Rhynchonella 
  sp. 
  

   Spiriferina 
  sp. 
  

   Terebratula 
  sp. 
  

   Orthis 
  burlingtonensis 
  Hall. 
  

   Orthis 
  swallovi 
  Hall. 
  

   Strophomena 
  analoga 
  Phillips. 
  

  

  Derbyia 
  keokuk 
  Hall. 
  

   Athyris 
  lamellosa 
  L'Eveille. 
  

   Productus 
  burlingtonensis 
  Hall. 
  

   Spirifer 
  lineata 
  Martin. 
  

   Athyris 
  incrassatus 
  Hall. 
  

   Spirifer 
  grimesi 
  Hall. 
  

   Productus 
  loevicostus 
  White. 
  

   Productus 
  punctatus 
  Martin. 
  

   Spirifer 
  forbesi 
  Norwood 
  and 
  Pratten. 
  

   Platyceras 
  sp. 
  

  

  Spirifer 
  hiplicatus, 
  a 
  lower 
  form 
  which 
  was 
  abundant 
  in 
  

   the 
  Spout 
  Spring 
  fauna, 
  is 
  still 
  one 
  of 
  the 
  common 
  species. 
  

   Spirifer 
  grimesi 
  which 
  is 
  the 
  most 
  characteristic 
  brachiopod 
  

   of 
  the 
  Burlington 
  limestone, 
  is 
  rare 
  in 
  this 
  whole 
  zone. 
  

  

  The 
  contact 
  between 
  Zone 
  I 
  and 
  the 
  overlying 
  beds 
  is 
  gene- 
  

   rally 
  quite 
  well 
  defined 
  lithologically, 
  but 
  in 
  some 
  cases 
  the 
  

   transition 
  between 
  the 
  two 
  is 
  gradual. 
  

  

  Zone 
  II 
  — 
  The 
  lithological 
  characters 
  of 
  the 
  beds 
  of 
  this 
  

   zone 
  are 
  decidedly 
  different 
  from 
  those 
  below. 
  Here 
  we 
  pass 
  

   into 
  beds 
  of 
  rather 
  coarse, 
  crystalline 
  limestone, 
  composed 
  

   largely 
  of 
  broken 
  crinoid 
  fragments, 
  the 
  fauna 
  is 
  a 
  typical 
  

   Burlington 
  one. 
  

  

  At 
  Jones 
  Spring 
  (Station 
  1), 
  these 
  beds 
  are 
  exposed 
  lying 
  

   directly 
  upon 
  the 
  more 
  compact 
  limestone 
  of 
  Zone 
  I. 
  The 
  

   following 
  fauna 
  was 
  collected 
  at 
  this 
  station. 
  

  

  Spirifer 
  grimesi 
  Hall. 
  

   Spirifer 
  keokuk 
  Hall. 
  ? 
  

   Productus 
  sp. 
  

  

  Athyris 
  lamellosa 
  L'Eveille. 
  

   Chonetes 
  illinoisensis 
  Worthen. 
  

   Straparollus 
  latus 
  Hall. 
  

   Spirifer 
  suborbicularis 
  Hall. 
  

   Strophomena 
  analoga 
  Phillips. 
  

  

  Orthis 
  burlingtonensis 
  Hall. 
  

   Zaphrentis 
  centralis 
  Worthen. 
  

   Platyceras 
  sp. 
  

   Productus 
  sp. 
  

   Syringothyris 
  plenus 
  Hall. 
  

   Orthis 
  swallovi 
  Hall. 
  

   Productus 
  burlingtonensis 
  Hall. 
  

  

  In 
  a 
  quarry 
  at 
  the 
  Yalley 
  Water 
  Mills 
  (Station 
  18), 
  the 
  fol- 
  

   lowing 
  species 
  were 
  collected, 
  lying 
  immediately 
  above 
  Zone 
  I. 
  

  

  Spirifer 
  grimesi 
  Hall. 
  

   Athyris 
  incrassatus 
  Hall. 
  

   Orthis 
  swallovi 
  Hall. 
  

   Strophomena 
  analoga 
  Phillips. 
  

   Straparollus 
  latus 
  Hall. 
  

   Athyris 
  lamellosa 
  L'Eveille. 
  

  

  Spirifer 
  forbesi 
  Norwood 
  and 
  Pratten. 
  

  

  Derbyia 
  keokuk 
  Hall. 
  

  

  Platyceras 
  sp. 
  

  

  Zaphrentis 
  centralis 
  Worthen. 
  

  

  Syringopora 
  harveyi 
  White. 
  

  

  In 
  a 
  quarry 
  at 
  Edward's 
  Spring 
  (Station 
  19), 
  in 
  strata 
  a 
  

   short 
  distance 
  above 
  those 
  containing 
  the 
  last 
  fauna 
  described 
  

   under 
  Zone 
  I, 
  these 
  beds 
  are 
  well 
  exposed. 
  Here 
  the 
  two 
  

   zones 
  are 
  not 
  sharply 
  defined 
  lithologically, 
  but 
  the 
  lower 
  one 
  

   grades 
  gradually 
  into 
  the 
  upper. 
  Two 
  more 
  or 
  less 
  distinct 
  

   beds 
  are 
  recognized 
  in 
  this 
  quarry. 
  From 
  the 
  lower 
  of 
  these 
  

   the 
  following 
  fauna 
  was 
  collected. 
  

  

  