﻿S. 
  Welle?' 
  — 
  Succession 
  of 
  Fossil 
  Faunas 
  in 
  Missouri. 
  195 
  

  

  r. 
  

  

  quarry, 
  Station 
  11. 
  The 
  section 
  at 
  this 
  station 
  is 
  as 
  follows, 
  

   beginning 
  with 
  the 
  lowest 
  stratum. 
  

  

  1. 
  Six 
  feet 
  of 
  coarse, 
  gray, 
  crystalline 
  limestone 
  with 
  many 
  fossils. 
  

  

  2. 
  Six 
  inch 
  band 
  of 
  lenticular 
  chert 
  nodules 
  bedded 
  in 
  limestone. 
  

  

  3. 
  Five 
  feet 
  of 
  limestone 
  similar 
  to 
  stratum 
  ], 
  but 
  with 
  few 
  fossils. 
  

  

  4. 
  One 
  foot 
  band 
  of 
  chert 
  and 
  limestone. 
  

  

  5. 
  Two 
  feet 
  of 
  hard 
  gray 
  limestone 
  with 
  few 
  fossils. 
  

  

  6. 
  Eighteen 
  inches 
  of 
  white 
  oolitic 
  limestone. 
  

  

  7. 
  One 
  foot 
  of 
  gray 
  limestone. 
  From 
  the 
  upper 
  surface 
  of 
  this 
  bed 
  

  

  large 
  stylolites, 
  often 
  six 
  inches 
  in 
  length, 
  extend 
  down 
  into 
  

   the 
  limestone. 
  These 
  stylolites 
  are 
  crowded 
  close 
  together 
  

   and 
  make 
  a 
  very 
  conspicuous 
  band 
  through 
  the 
  quarry. 
  

  

  8. 
  Three 
  feet 
  of 
  gray 
  limestone 
  with 
  few 
  fossils. 
  

  

  9. 
  Three 
  to 
  six 
  feet 
  to 
  the 
  top 
  of 
  the 
  bank. 
  A 
  somewhat 
  shaly 
  

  

  gray 
  limestone 
  with 
  many 
  fossils. 
  

  

  Stratum 
  1 
  has 
  been 
  considered 
  as 
  Zone 
  IX, 
  and 
  the 
  fauna 
  

   collected 
  is 
  as 
  follows 
  : 
  

  

  Orthis 
  dubia 
  Hall. 
  [ 
  Spirifer 
  tenuicostatus 
  Hall. 
  

  

  Athyris 
  planosulcata 
  Phillips. 
  Chonetes 
  illinoisensis 
  Worthen. 
  

  

  Derbyia 
  keokuk 
  Hall. 
  i 
  Zaphrentis 
  centralis 
  Worthen. 
  

  

  Productus 
  marginicinctus 
  Prout. 
  Platyceras 
  sp. 
  

  

  Syringothyris 
  sp. 
  j 
  Chetetes 
  sp. 
  

  

  Athyris 
  incrassatus 
  Hall. 
  | 
  Myalina 
  keokuk 
  Worthen. 
  

  

  Zone 
  X. 
  — 
  This 
  zone 
  is 
  represented 
  by 
  stratum 
  3 
  at 
  Station 
  

   11, 
  and 
  is 
  separated 
  from 
  the 
  preceding 
  zone 
  by 
  the 
  chert 
  

   band. 
  

  

  The 
  fauna 
  collected 
  is 
  as 
  follows: 
  

  

  Athyris 
  incrassatus 
  Hall. 
  Productus 
  setigerus 
  Hall. 
  

  

  Productus 
  punctatus 
  Martin. 
  Terebratula 
  sp 
  

  

  Spirifer 
  pseudolineata 
  Hall. 
  

   Spirifer 
  suborbicularis 
  Hall. 
  

   Syringothyris 
  textus 
  Hall. 
  

  

  Zone 
  XI. 
  — 
  The 
  next 
  fossiliferous 
  stratum 
  is 
  the 
  oolite 
  bed. 
  

   Few 
  fossils 
  were 
  collected 
  from 
  this 
  horizon 
  at 
  Station 
  11, 
  the 
  

   only 
  species 
  seen 
  being 
  Rhynchonella 
  mutata. 
  On 
  the 
  oppo- 
  

   site 
  side 
  of 
  Wilson 
  Creek, 
  however, 
  at 
  Station 
  10, 
  this 
  oolite 
  

   bed 
  is 
  nicely 
  exposed 
  and 
  has 
  many 
  fossils. 
  The 
  species 
  col- 
  

   lected 
  at 
  this 
  locality 
  are 
  as 
  follows 
  : 
  

  

  Rhynchonella 
  mutata 
  Hall. 
  

   Orthis 
  dubia 
  Hall. 
  

   Eumetria 
  cemeuilana 
  Hall. 
  

  

  Conocardium 
  indianense 
  Miller. 
  

   Aviculopecten 
  magna 
  Swallow. 
  

  

  Platyceras 
  acutirostris 
  Hall. 
  

   Conocardium 
  meekanum 
  Hall. 
  ? 
  

   Batocrinus 
  sp. 
  

   Pleurotomaria 
  sp. 
  

  

  Derbyia 
  keokuk 
  Hall. 
  

  

  It 
  is 
  interesting 
  to 
  note 
  the 
  similarity 
  between 
  this 
  fauna 
  

   and 
  that 
  of 
  the 
  Spergen 
  Hill 
  beds 
  in 
  Indiana. 
  Both 
  faunas 
  

   are 
  made 
  up, 
  to 
  a 
  very 
  great 
  extent, 
  of 
  diminutive 
  forms, 
  most 
  

   of 
  the 
  species 
  occurring 
  at 
  Springfield 
  being 
  also 
  present 
  at 
  

   Spergen 
  Hill. 
  In 
  both 
  localities 
  the 
  rock 
  is 
  an 
  oolitic 
  lime- 
  

   stone, 
  and 
  the 
  similarity 
  of 
  the 
  faunas 
  is 
  probably 
  due 
  to 
  the 
  

  

  