﻿the 
  Pennsylvanian 
  Strata 
  of 
  Kansas. 
  373 
  

  

  ice. 
  If 
  the 
  bowlders 
  are 
  in 
  the 
  Pennsylvanian 
  strata, 
  then 
  

   they 
  must 
  have 
  been 
  deposited 
  by 
  floating 
  ice, 
  for 
  only 
  in 
  such 
  

   a 
  way 
  could 
  the 
  very 
  local 
  distribution 
  have 
  been 
  effected 
  and 
  

   the 
  deposition 
  have 
  been 
  made 
  in 
  the 
  midst 
  of 
  muds 
  laid 
  down 
  

   in 
  quiet 
  waters. 
  If 
  the 
  bowlders 
  are 
  of 
  comparatively 
  recent 
  

   time, 
  that 
  is 
  Tertiary 
  or 
  early 
  Pleistocene, 
  they 
  must 
  have 
  

   been 
  laid 
  down 
  either 
  by 
  a 
  glacier 
  or 
  ice 
  floating 
  in 
  a 
  stream 
  

   flowing 
  from 
  its 
  margin. 
  

  

  In 
  seeking 
  for 
  the 
  place 
  of 
  origin 
  of 
  the 
  bowlders, 
  compari- 
  

   son 
  was 
  made 
  with 
  specimens 
  of 
  Missouri 
  and 
  Lake 
  Superior 
  

   granites 
  of 
  which 
  the 
  University 
  of 
  Wisconsin 
  has 
  collections 
  

   containing 
  about 
  all 
  the 
  varieties, 
  while 
  the 
  literature 
  was 
  

   examined 
  for 
  data 
  relating 
  to 
  the 
  granites 
  of 
  the 
  Wichita 
  and 
  

   Arbuckle 
  mountains. 
  This 
  search 
  has 
  yielded 
  negative 
  or 
  

   uncertain 
  results. 
  In 
  addition, 
  Professor 
  E. 
  Haworth 
  very 
  

   kindly 
  loaned 
  for 
  comparison 
  a 
  specimen 
  of 
  the 
  rock 
  which 
  

   was 
  reported 
  to 
  have 
  come 
  from 
  one 
  of 
  the 
  Zeandale 
  wells. 
  

   The 
  latter, 
  mineralogically 
  and 
  texturally, 
  is 
  altogether 
  unlike 
  

   the 
  Rose 
  bowlders 
  and 
  the 
  same 
  is 
  essentially 
  the 
  case 
  with 
  

   respect 
  to 
  the 
  Missouri 
  granites. 
  So 
  far 
  as 
  the 
  literature 
  is 
  

   concerned, 
  it 
  appears 
  quite 
  unlikely 
  that 
  a 
  granite 
  of 
  the 
  char- 
  

   acteristics 
  of 
  that 
  composing 
  the 
  Pose 
  bowlders 
  is 
  present 
  in 
  

   either 
  the 
  Arbuckle 
  or 
  Wichita 
  mountains. 
  

  

  In 
  respect 
  to 
  the 
  granites 
  of 
  the 
  Lake 
  Superior 
  region, 
  the 
  

   examination 
  was 
  limited 
  to 
  those 
  of 
  the 
  Vermilion 
  Pange 
  of 
  

   northern 
  Minnesota 
  which 
  Doctor 
  C. 
  K. 
  Leith 
  suggested 
  most 
  

   nearly 
  resembled 
  that 
  of 
  the 
  Pose 
  bowlders. 
  The 
  specimens 
  

   which 
  are 
  most 
  similar 
  came 
  from 
  the 
  recomposed 
  granite 
  of 
  

   Lake 
  Saganaga. 
  According 
  to 
  Grant, 
  the 
  original 
  Saganaga 
  

   granite 
  "is 
  coarse-grained 
  gray 
  to 
  reddish 
  granite 
  .... 
  of 
  

   which 
  the 
  chief 
  constituents 
  are 
  quartz, 
  orthoclase, 
  acid 
  plagio- 
  

   clase 
  and 
  hornblende. 
  A 
  peculiar 
  and 
  characteristic 
  feature 
  

   of 
  this 
  .granite 
  is 
  in 
  its 
  large 
  grains 
  of 
  quartz, 
  which 
  are 
  con- 
  

   spicuous 
  on 
  weathered 
  surfaces. 
  The 
  quartzes 
  are 
  commonly 
  

   a 
  quarter 
  of 
  an 
  inch 
  in 
  diameter 
  and 
  they 
  frequently 
  become 
  

   larger." 
  In 
  the 
  recomposed 
  granites 
  which 
  developed 
  from 
  

   these 
  " 
  the 
  hornblende 
  of 
  the 
  true 
  granite 
  is 
  wanting."* 
  This 
  

   description 
  approximates 
  that 
  of 
  the 
  Pose 
  bowlders, 
  but 
  the 
  

   similarity 
  comes 
  far 
  from 
  approaching 
  identity, 
  and 
  the 
  exam- 
  

   ination 
  of 
  specimens 
  of 
  the 
  recomposed 
  granite 
  made 
  this 
  much 
  

   clearer 
  since 
  the 
  textures 
  of 
  the 
  two 
  rocks 
  are 
  quite 
  different. 
  

   In 
  the 
  Pose 
  bowlders 
  the 
  phenocrysts 
  of 
  quartz 
  are 
  larger 
  and 
  

   this 
  mineral 
  has 
  a 
  different 
  appearance, 
  the 
  proportion 
  of 
  

   quartz 
  is 
  less, 
  the 
  average 
  grain 
  is 
  larger, 
  while 
  there 
  are 
  no 
  

   large 
  phenocrysts 
  of 
  feldspar 
  in 
  the 
  recomposed 
  Saganaga 
  

  

  * 
  Grant, 
  Geol. 
  and 
  Nat. 
  Hist. 
  Surv. 
  Minn., 
  vol. 
  iv, 
  p. 
  322, 
  1897. 
  

  

  