﻿216 
  Taylor 
  — 
  Scoured 
  Bowlders 
  of 
  the 
  Mattawa 
  Valley. 
  

  

  resented 
  by 
  notches 
  in 
  the 
  rims 
  of 
  shallow 
  basins. 
  These 
  are 
  

   well 
  marked 
  sometimes, 
  showing 
  where 
  the 
  sand 
  and 
  pebbles 
  

   left 
  the 
  basin, 
  and 
  occasionally 
  a 
  notch 
  is 
  found 
  also 
  on 
  the 
  up- 
  

   stream 
  side 
  where 
  they 
  entered, 
  if 
  the 
  bowlder 
  be 
  not 
  too 
  

   small 
  and 
  its 
  up-stream 
  rim 
  too 
  narrow. 
  

  

  Facetted 
  bowlders 
  have 
  plane 
  faces 
  or 
  facets 
  worn 
  smooth. 
  

   Probably 
  in 
  nearly 
  all 
  cases 
  the 
  facets 
  existed 
  in 
  the 
  rough 
  

   before 
  the 
  scouring. 
  It 
  would 
  be 
  hard 
  in 
  any 
  given 
  case 
  to 
  

   prove 
  that 
  this 
  was 
  not 
  true. 
  Still, 
  it 
  is 
  possible 
  that 
  facets 
  

   have 
  sometimes 
  been 
  made 
  by 
  scour 
  when 
  the 
  facet 
  shape 
  did 
  

   not 
  previously 
  exist. 
  This 
  variety 
  is 
  fairly 
  plentiful. 
  

  

  Smoothed 
  bowlders 
  are 
  far 
  more 
  abundant 
  than 
  all 
  the 
  other 
  

   varieties 
  put 
  together. 
  Almost 
  every 
  bowlder 
  that 
  has 
  a 
  more 
  

   specific 
  mark 
  of 
  scour 
  shows 
  smoothed 
  surfaces 
  also 
  on 
  other 
  

   parts. 
  A 
  smoothed 
  bowlder 
  is 
  one 
  that 
  has 
  simply 
  been 
  made 
  

   smooth 
  by 
  scouring 
  and 
  may 
  not 
  have 
  received 
  any 
  other 
  more 
  

   definite 
  mark 
  in 
  the 
  process. 
  These 
  bowlders 
  may 
  have 
  been 
  

   angular 
  or 
  subangular 
  or 
  rounded 
  before 
  the 
  scouring 
  began, 
  

   and 
  without 
  having 
  their 
  general 
  form 
  changed 
  they 
  were 
  

   made 
  smooth 
  over 
  all 
  surfaces 
  alike. 
  In 
  the 
  old 
  channels 
  

   where 
  the 
  scoured 
  bowlders 
  occur 
  almost 
  every 
  one 
  shows 
  

   more 
  or 
  less 
  of 
  this 
  effect. 
  There 
  are 
  great 
  numbers 
  of 
  

   scoured 
  bowlders 
  along 
  the 
  roadside 
  near 
  the 
  Presbyterian 
  

   church 
  in 
  Mattawa 
  and 
  farther 
  east 
  for 
  a 
  quarter 
  of 
  a 
  mile. 
  

   Near 
  the 
  church 
  there 
  are 
  many 
  fine 
  examples 
  of 
  smoothed 
  

   and 
  basined 
  bowlders. 
  Some 
  of 
  them 
  are 
  polished 
  so 
  smooth 
  

   on 
  one 
  or 
  more 
  sides 
  that 
  they 
  glisten 
  a 
  little 
  in 
  the 
  sunshine 
  

   even 
  when 
  they 
  are 
  dry. 
  They 
  have 
  a 
  smooth, 
  soft 
  feel 
  under 
  

   the 
  hand, 
  not 
  like 
  a 
  pane 
  of 
  glass, 
  but 
  rather 
  like 
  a 
  surface 
  of 
  

   finely 
  embossed 
  leather. 
  Most 
  of 
  the 
  bowlders 
  along 
  the 
  road 
  

   near 
  the 
  church 
  have 
  been 
  moved 
  in 
  road 
  improvement 
  or 
  in 
  

   clearing 
  ground 
  for 
  buildings. 
  It 
  is 
  probable 
  that 
  the 
  most 
  

   highly 
  polished 
  parts 
  of 
  the 
  best 
  specimens 
  were 
  previously 
  on 
  

   the 
  under 
  side 
  or 
  buried, 
  and 
  so 
  protected 
  from 
  the 
  weather 
  

   ever 
  since 
  they 
  were 
  polished. 
  This 
  suggests 
  that 
  many, 
  at 
  

   least 
  of 
  the 
  smaller 
  bowlders, 
  were 
  turned 
  over 
  and 
  partly 
  

   buried 
  during 
  the 
  time 
  of 
  the 
  great 
  outlet 
  river. 
  They 
  were 
  

   scoured 
  and 
  polished 
  and 
  turned 
  over 
  before 
  the 
  river 
  ceased 
  

   to 
  flow. 
  It 
  is 
  quite 
  possible 
  that 
  other 
  forms 
  of 
  scour 
  may 
  be 
  

   found 
  on 
  bowlders 
  which 
  would 
  suggest 
  the 
  propriety 
  of 
  add- 
  

   ing 
  more 
  varieties 
  to 
  the 
  list 
  given 
  above. 
  But 
  the 
  forms 
  

   found 
  by 
  the 
  author, 
  and 
  examined 
  also 
  by 
  Dr. 
  Bell, 
  seem 
  to 
  

   be 
  fairly 
  well 
  covered 
  by 
  the 
  names 
  suggested. 
  

  

  One 
  other 
  possible 
  variety 
  deserves 
  mention. 
  When 
  the 
  

   deep 
  cut 
  was 
  made 
  through 
  the 
  bowldery 
  terrace 
  in 
  Mattawa 
  

   for 
  the 
  branch 
  railroad 
  up 
  the 
  Ottawa, 
  some 
  very 
  curiously 
  

   shaped 
  stones 
  were 
  found 
  in 
  the 
  gravelly 
  top 
  layer. 
  Among 
  

   others 
  was 
  one 
  roughly 
  cone-shaped, 
  but 
  flaring 
  out 
  slightly 
  at 
  

   the 
  base. 
  It 
  is 
  almost 
  perfectly 
  round 
  on 
  any 
  horizontal 
  sec- 
  

  

  