﻿366 
  

  

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

  

  so 
  numerous 
  on 
  this 
  mound 
  that 
  about 
  one-fourth 
  of 
  the 
  sur- 
  

   face 
  is 
  covered 
  and 
  they 
  have 
  made 
  impossible 
  its 
  cultivation, 
  

   so 
  that 
  at 
  present 
  it 
  is 
  given 
  over 
  to 
  the 
  growth 
  of 
  bushes, 
  and 
  

   such 
  appears 
  to 
  have 
  always 
  been 
  the 
  case. 
  None 
  of 
  the 
  other 
  

   mounds 
  contains 
  a 
  twentieth 
  as 
  mauy 
  bowlders 
  as 
  does 
  this. 
  

   In 
  addition 
  to 
  the 
  larger 
  mounds, 
  there 
  are 
  about 
  a 
  half 
  dozen 
  

   others 
  of 
  much 
  smaller 
  height 
  and 
  area 
  which 
  have 
  not 
  been 
  

   mowed 
  or 
  plowed 
  because 
  of 
  projecting 
  bowlders. 
  These 
  

   smaller 
  elevations 
  are 
  situated 
  between 
  and 
  for 
  about 
  a 
  hundred 
  

   feet 
  on 
  either 
  side 
  of 
  the 
  larger 
  and 
  they 
  also 
  extend 
  much 
  

  

  Fig. 
  2. 
  

  

  6 
  

  

  5 
  

  

  7 
  

  

  QSlhoo/ 
  Ho* 
  * 
  

  

  Emtt-WPtE 
  

  

  Fig. 
  2. 
  Outline 
  map 
  of 
  the 
  region 
  of 
  the 
  bowlders. 
  Each 
  square 
  repre- 
  

   sents 
  forty 
  acres. 
  The 
  section 
  on 
  the 
  right 
  of 
  the 
  north-south 
  road 
  is 
  

   T. 
  26 
  S., 
  R. 
  XVI 
  E., 
  S. 
  18, 
  Eminence 
  township 
  ; 
  while 
  the 
  area 
  on 
  the 
  left 
  is 
  

   in 
  T. 
  26 
  S., 
  E. 
  XV 
  E., 
  S. 
  13. 
  The 
  area 
  within 
  the 
  dashed 
  line 
  carries 
  

   bowlders 
  which 
  appear 
  to 
  be 
  in 
  approximately 
  natural 
  position. 
  The 
  large 
  

   mounds 
  extend 
  from 
  A 
  to 
  B, 
  A 
  being 
  the 
  position 
  of 
  the 
  most 
  western 
  

   mound. 
  

  

  farther 
  east, 
  but 
  there 
  are 
  none 
  toward 
  the 
  west. 
  The 
  four 
  

   largest 
  mounds 
  are 
  aligned 
  in 
  a 
  direction 
  a 
  little 
  south 
  of 
  east 
  

   and 
  they 
  extend 
  through 
  about 
  a 
  thousand 
  feet. 
  The 
  align- 
  

   ment 
  coincides 
  with 
  the 
  outcrop 
  of 
  the 
  shales 
  with 
  which 
  the 
  

   bowlders 
  are 
  associated. 
  

  

  The 
  most 
  western 
  of 
  the 
  large 
  mounds 
  has 
  a 
  dozen 
  or 
  more 
  

   bowlders 
  with 
  diameters 
  of 
  about 
  four 
  feet 
  and 
  there 
  are 
  

   probably 
  between 
  fifty 
  and 
  a 
  hundred 
  that 
  are 
  more 
  than 
  a 
  

   foot 
  and 
  a 
  half 
  in 
  diameter. 
  The 
  largest 
  bowlder 
  observed 
  

   is 
  on 
  one 
  of 
  the 
  smaller 
  mounds 
  and 
  it 
  has 
  a 
  diameter 
  of 
  nearly 
  

   seven 
  feet. 
  

  

  