﻿374 
  W. 
  H. 
  Twenhofel 
  — 
  Granite 
  Bowlders 
  in 
  (f 
  ) 
  

  

  granites. 
  Furthermore, 
  the 
  general 
  appearance 
  of 
  the 
  two 
  

   rocks 
  is 
  quite 
  different, 
  and 
  the 
  recementation 
  appears 
  to 
  have 
  

   been 
  accomplished 
  by 
  different 
  methods. 
  

  

  The 
  Rocky 
  Mountain 
  granites 
  were 
  not 
  examined 
  since 
  it 
  

   does 
  not 
  seem 
  likely 
  that 
  any 
  of 
  the 
  known 
  conditions 
  of 
  pres- 
  

   ent 
  and 
  past 
  drainage 
  would 
  permit 
  the 
  bowlders 
  to 
  be 
  derived 
  

   therefrom.* 
  

  

  Stratigraphic 
  Position 
  of 
  the 
  Bowlders. 
  

  

  The 
  local 
  section 
  of 
  the 
  region 
  under 
  consideration 
  belongs 
  

   to 
  the 
  Douglas 
  and 
  Pottawatomie 
  formations 
  of 
  the 
  Penn- 
  

   sylvanian 
  system 
  and 
  consists 
  at 
  the 
  base 
  of 
  the 
  Stanton- 
  Allen 
  

   limestones 
  with 
  a 
  thickness 
  estimated 
  at 
  about 
  fifty 
  feet. 
  The 
  

   former 
  limestone 
  is 
  above 
  the 
  latter 
  and 
  there 
  is 
  generally 
  

   a 
  separating 
  shale. 
  Overlying 
  the 
  limestones 
  are 
  the 
  LePoy 
  

   shales 
  and 
  sandstones. 
  The 
  local 
  thickness 
  of 
  this 
  member 
  

   slightly 
  exceeds 
  two 
  hundred 
  feet. 
  These 
  two 
  divisions 
  

   are 
  the 
  only 
  ones 
  exposed 
  on 
  the 
  hills 
  at 
  Pose. 
  To 
  

   the 
  east 
  lower 
  strata 
  appear 
  and 
  to 
  the 
  west 
  higher 
  ones. 
  The 
  

   LePoy 
  shales 
  and 
  sandstones 
  consist 
  of 
  black 
  shales 
  throughout 
  

   the 
  basal 
  eighty 
  or 
  ninety 
  feet 
  while 
  the 
  upper 
  portion 
  is 
  com- 
  

   posed 
  of 
  red 
  and 
  yellow 
  sandstones 
  and 
  sandy 
  shales. 
  These 
  

   sediments 
  are 
  probably 
  of 
  deltaic 
  and 
  fluvial 
  origin 
  in 
  the 
  

   region 
  under 
  consideration. 
  

  

  Succeeding 
  the 
  LePoy 
  shales 
  are 
  the 
  Iatan 
  (Kickapoo) 
  lime- 
  

   stone 
  and 
  the 
  Lawrence 
  shales 
  and 
  sandstones. 
  Below 
  the 
  

   Allen 
  limestone 
  are 
  the 
  Lane 
  shales 
  and 
  this 
  is 
  preceded 
  by 
  

   the 
  Iola 
  limestone. 
  

  

  At 
  present 
  the 
  bowlders 
  are 
  on 
  the 
  surface 
  of 
  a 
  hill 
  at 
  a 
  

   level 
  varying 
  from 
  eight 
  or 
  ten 
  feet 
  above 
  the 
  Stanton 
  lime- 
  

   stone 
  to 
  about 
  fifteen 
  feet 
  above, 
  the 
  largest 
  and 
  best 
  preserved 
  

   being 
  at 
  the 
  latter 
  level 
  and 
  the 
  large 
  mounds 
  previously 
  

   described 
  lie 
  at 
  this 
  upper 
  level. 
  The 
  associated 
  strata 
  belong 
  

   to 
  the 
  black 
  shale 
  division 
  of 
  the 
  LeRoy 
  shales 
  and 
  sandstones 
  

   and 
  these 
  shales 
  underlie 
  the 
  entire 
  hill 
  top 
  on 
  which 
  the 
  

   bowlders 
  were 
  seen, 
  the 
  shales 
  immediately 
  underlying 
  the 
  

   bowlders 
  being 
  nearly 
  the 
  highest 
  exposed 
  on 
  the 
  hill. 
  The 
  

   nearer 
  the 
  surface 
  is 
  to 
  the 
  top 
  of 
  the 
  Stanton 
  limestone, 
  the 
  

   fewer, 
  the 
  smaller 
  and 
  the 
  more 
  poorly 
  preserved 
  are 
  the 
  

   granite 
  bowlders, 
  and 
  where 
  the 
  shales 
  are 
  altogether 
  removed 
  

  

  * 
  It 
  was 
  also 
  considered 
  whether 
  the 
  bowlders 
  might 
  not 
  have 
  been 
  brought 
  

   to 
  their 
  present 
  position 
  by 
  man. 
  The 
  hypothesis 
  was 
  rejected 
  as 
  altogether 
  

   untenable. 
  

  

  (Since 
  going 
  to 
  press, 
  cuttings 
  from 
  three 
  other 
  recently 
  drilled 
  wells 
  of 
  

   central 
  Kansas 
  which 
  have 
  been 
  reported 
  to 
  have 
  reached 
  granites 
  have 
  been 
  

   sent 
  to 
  the 
  writer 
  for 
  examination. 
  There 
  is 
  no 
  resemblance 
  between 
  the 
  

   materials 
  from 
  these 
  wells 
  and 
  the 
  granite 
  of 
  the 
  Eose 
  bowlders.) 
  

  

  