﻿S. 
  Welle?' 
  — 
  Succession 
  of 
  Fossil 
  Faunas 
  in 
  Missouri. 
  185 
  

  

  upper, 
  slack-water 
  part 
  ; 
  but 
  only 
  clay 
  and 
  fine 
  fragments 
  of 
  

   the 
  local 
  Devonian 
  rocks. 
  This 
  lies 
  on 
  what 
  seems 
  to 
  be 
  sub- 
  

   glacial 
  till 
  ; 
  but 
  the 
  exposures 
  were 
  so 
  small, 
  and 
  the 
  time 
  for 
  

   study 
  so 
  short 
  that 
  it 
  may 
  have 
  been 
  a 
  hard 
  clayey 
  modified 
  

   drift. 
  At 
  any 
  rate 
  it 
  was 
  dense 
  and 
  unstratified. 
  One 
  argu- 
  

   ment 
  in 
  favor 
  of 
  its 
  being 
  till 
  was 
  that 
  it 
  lay 
  on 
  rotten 
  local 
  

   rock 
  from 
  which 
  the 
  old 
  surface 
  had 
  been 
  removed. 
  Going 
  

   south 
  along 
  Bald 
  Eagle 
  valley 
  the 
  inequalities 
  of 
  the 
  valley 
  are 
  

   covered 
  by 
  gravel 
  in 
  the 
  place 
  of 
  the 
  Mill 
  Hall 
  drift, 
  and 
  that 
  

   is 
  capped 
  by 
  slack 
  water 
  sands 
  and 
  clays 
  — 
  all 
  unstratified. 
  

   This 
  shows 
  that 
  the 
  action 
  was 
  continuous. 
  On 
  crossing 
  the 
  

   divide 
  the 
  modified 
  drift 
  continues 
  at 
  varying 
  thicknesses 
  ; 
  but 
  

   always 
  unstratified, 
  and 
  the 
  slack 
  water 
  clays 
  of 
  the 
  northern 
  

   side 
  are 
  replaced 
  by 
  sands 
  and 
  fine 
  stuff 
  as 
  the 
  torrential 
  nature 
  

   of 
  the 
  flow 
  gradually 
  ceased. 
  An 
  excellent 
  section 
  is 
  seen 
  in 
  

   the 
  creek 
  at 
  Vail 
  — 
  about 
  125 
  feet 
  below 
  the 
  divide, 
  and 
  the 
  

   same 
  distance 
  above 
  the 
  Juniata 
  at 
  Tyrone. 
  At 
  East 
  Tyrone, 
  

   in 
  the 
  yard 
  of 
  the 
  Pennsylvania 
  R. 
  R., 
  many 
  fine 
  sections 
  are 
  

   shown, 
  and 
  the 
  succession 
  is 
  similar 
  to 
  those 
  described. 
  Hunt- 
  

   ingdon 
  is 
  built 
  on 
  a 
  flood 
  cone 
  where 
  the 
  Juniata 
  pours 
  through 
  

   a 
  narrow 
  gorge 
  into 
  a 
  wide 
  cross 
  valley. 
  

  

  Art. 
  XVIII. 
  — 
  The 
  Succession 
  of 
  Fossil 
  Faunas 
  at 
  Springfield, 
  

   Missouri; 
  by 
  Stuart 
  Weller. 
  

  

  Introduction. 
  

  

  The 
  rocks 
  under 
  consideration 
  in 
  this 
  paper, 
  are 
  those 
  lying 
  

   above 
  the 
  yellow 
  Chouteau 
  limestone 
  in 
  the 
  region 
  in 
  question. 
  

   They 
  consist 
  of 
  beds 
  of 
  gray 
  limestone, 
  more 
  or 
  less 
  crystalline 
  

   in 
  the 
  various 
  strata, 
  with 
  scattered 
  bands 
  of 
  lenticular 
  chert 
  

   concretions. 
  No 
  results 
  of 
  careful 
  stratigraphical 
  work, 
  based 
  

   on 
  palseontological 
  evidence, 
  have 
  ever 
  been 
  published 
  in 
  con- 
  

   nection 
  with 
  this 
  region, 
  and 
  though 
  the 
  rocks 
  have 
  been 
  cor- 
  

   rectly 
  considered 
  as 
  equivalent 
  to 
  that 
  part 
  of 
  the 
  Mississippian 
  

   Series 
  known 
  in 
  Illinois 
  and 
  Iowa 
  as 
  the 
  Burlington 
  and 
  Keo- 
  

   kuk 
  Groups, 
  the 
  subdivisions 
  of 
  the 
  strata 
  have 
  never 
  been 
  

   properly 
  pointed 
  out. 
  The 
  object 
  of 
  the 
  present 
  paper 
  is 
  to 
  

   dissect 
  out 
  the 
  various 
  sub-faunas, 
  to 
  note 
  their 
  order 
  of 
  succes- 
  

   sion 
  and 
  the 
  relations 
  which 
  they 
  fyold 
  to 
  each 
  other. 
  

  

  During 
  the 
  summers 
  of 
  1892 
  and 
  1893 
  the 
  writer 
  made 
  

   quite 
  extensive 
  collections 
  of 
  the 
  fossils 
  from 
  the 
  quarries 
  and 
  

   other 
  exposures 
  in 
  and 
  about 
  Springfield. 
  From 
  the 
  study 
  of 
  

   these 
  collections, 
  the 
  whole 
  series 
  of 
  strata 
  has 
  been 
  divided 
  

   into 
  twelve 
  zones, 
  which 
  can 
  be 
  distinguished 
  by 
  their 
  faunas. 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Third 
  Series, 
  Vol. 
  XLIX, 
  No. 
  291. 
  — 
  March, 
  1895. 
  

   13 
  

  

  