﻿E. 
  B. 
  Branson 
  — 
  Geologic 
  Section 
  in 
  Missouri, 
  277 
  

  

  and 
  shows 
  the 
  Ordovician 
  limestone 
  (in 
  the 
  main 
  Kimms- 
  

   wick 
  but 
  including 
  some 
  Joachim) 
  extending 
  from 
  

   Hannibal 
  to 
  Sedalia. 
  The 
  western 
  edge 
  of 
  both 
  the 
  

   Ordovician 
  formations 
  is 
  in 
  eastern 
  Callaway 
  County 
  

   about 
  90 
  miles 
  from 
  Sedalia. 
  His 
  section 
  also 
  shows 
  the 
  

   St. 
  Peter 
  sandstone 
  as 
  a 
  continuous 
  formation 
  from 
  Han- 
  

   nibal 
  to 
  Sedalia, 
  whereas 
  it 
  is 
  discontinuous 
  for 
  about 
  90 
  

   miles 
  from 
  Sedalia. 
  

  

  It 
  is 
  true 
  that 
  the 
  main 
  object 
  of 
  Keyes' 
  article 
  is 
  to 
  

   show 
  the 
  relationships 
  of 
  the 
  Chouteau, 
  but 
  even 
  these 
  

   are 
  erroneous 
  west 
  of 
  the 
  outcrops 
  of 
  the 
  Mississippi 
  

   River 
  and 
  its 
  tributaries. 
  

  

  These 
  late 
  sections 
  of 
  Keyes 
  practically 
  repeat 
  those 
  

   of 
  an 
  earlier 
  article 
  in 
  a 
  Bulletin 
  of 
  the 
  Geological 
  

   Society 
  of 
  America. 
  8 
  Both 
  articles 
  mislead 
  in 
  verifying, 
  

   by 
  seemingly 
  later 
  investigations, 
  errors 
  of 
  the 
  reports 
  

   of 
  Swallow, 
  9 
  Meek, 
  10 
  and 
  Broadhead. 
  11 
  None 
  of 
  these 
  

   reports 
  were 
  detailed 
  and 
  many 
  identifications 
  of 
  strata 
  

   were 
  left 
  provisional 
  awaiting 
  further 
  investigations. 
  

   Some 
  studies 
  on 
  the 
  areas 
  considered 
  in 
  this 
  discussion 
  

   were 
  made 
  by 
  Keyes 
  and 
  his 
  helpers 
  on 
  the 
  Missouri 
  

   Survey 
  but 
  they 
  were 
  in 
  the 
  nature 
  of 
  reconnaisance 
  

   work. 
  It 
  is 
  hard 
  to 
  understand 
  how 
  even 
  a 
  few 
  days 
  

   work 
  on 
  the 
  geology 
  of 
  Pettis 
  and 
  Cooper 
  counties 
  could 
  

   leave 
  any 
  warrant 
  for 
  the 
  sections 
  given 
  by 
  Keyes. 
  

  

  While 
  mapping 
  the 
  Cooper 
  limestone 
  in 
  Pettis 
  and 
  

   Cooper 
  counties, 
  the 
  writer 
  visited 
  all 
  the 
  localities 
  for 
  

   Vermicular 
  sandstone, 
  Louisiana 
  limestone, 
  and 
  Cooper 
  

   marble 
  mentioned 
  by 
  Swallow 
  in 
  Reports 
  I 
  and 
  II 
  of 
  the 
  

   Geological 
  Survey 
  of 
  Missouri, 
  and 
  no 
  Vermicular 
  nor 
  

   Louisiana 
  was 
  found. 
  A 
  sandy 
  phase 
  near 
  the 
  middle 
  

   of 
  the 
  Chouteau 
  seems 
  to 
  have 
  been 
  identified 
  as 
  Ver- 
  

   micular 
  though 
  it 
  shows 
  only 
  rarely 
  any 
  Vermicular 
  

   markings 
  and 
  contains 
  a 
  typical 
  Chouteau 
  fauna. 
  The 
  

   Chouteau 
  limestone 
  below 
  the 
  sandstone 
  was 
  identified 
  

   as 
  Louisiana 
  by 
  Swallow, 
  though 
  from 
  bottom 
  to 
  top 
  it 
  

   contains 
  the 
  most 
  typical 
  of 
  Chouteau 
  species 
  in 
  abun- 
  

   dance. 
  The 
  Sylamore 
  is 
  so 
  thin 
  and 
  inconspicuous 
  that 
  

   it 
  was 
  not 
  recognized 
  as 
  a 
  formation 
  by 
  Swallow. 
  Swal- 
  

  

  8 
  Bull. 
  Geol. 
  Soe. 
  Am., 
  vol. 
  13, 
  pi. 
  44. 
  

  

  9 
  Geol. 
  Survey 
  of 
  Missouri, 
  First 
  and 
  Second 
  Annual 
  Eeports, 
  Part 
  I, 
  

   pp. 
  186-203. 
  

  

  10 
  Ibid., 
  Part 
  II, 
  pp. 
  95-119. 
  

  

  n 
  Geol. 
  Survey 
  of 
  Missouri, 
  1855-1871, 
  pp. 
  37-64. 
  

  

  