﻿GEOLOGY 
  OF 
  THE 
  THOUSAND 
  ISLANDS 
  REGION 
  163 
  

  

  short. 
  The 
  longer 
  lines 
  have 
  an 
  arc 
  of 
  6 
  inches 
  or 
  a 
  radius 
  of 
  about 
  

   3^ 
  inches. 
  

  

  Another 
  excellent 
  illustration 
  of 
  the 
  chatters 
  is 
  on 
  the 
  highway 
  

   3 
  miles 
  north 
  of 
  Redwood 
  on 
  the 
  road 
  to 
  Chippewa 
  Bay, 
  at 
  the 
  point 
  

   indicated 
  on 
  plate 
  47. 
  Several 
  very 
  large 
  examples 
  occur 
  in 
  

   the 
  middle 
  of 
  the 
  street 
  in 
  Redwood 
  village, 
  just 
  below 
  the 
  Bollinger 
  

   House. 
  Smaller 
  examples 
  are 
  so 
  very 
  numerous 
  that 
  no 
  notebook 
  

   record 
  was 
  made 
  of 
  them. 
  Fine 
  examples 
  occur 
  with 
  the 
  curved 
  

   scorings. 
  

  

  The 
  chatter 
  fractures 
  dip 
  so 
  steeply 
  into 
  the 
  rock 
  that 
  rarely 
  is 
  

   there 
  any 
  flaking 
  of 
  the 
  surface 
  rock. 
  In 
  many 
  instances 
  no 
  axial 
  

   grooving 
  or 
  crushing 
  of 
  the 
  rock 
  is 
  visible, 
  the 
  appearance 
  being 
  

   as 
  if 
  the 
  rock 
  had 
  been 
  abraded 
  and 
  resurfaced 
  and 
  polished 
  so 
  as 
  

   to 
  leave 
  merely 
  the 
  clean-cut 
  concentric 
  fracture 
  lines. 
  Such 
  

   abrasion 
  is 
  more 
  than 
  possible 
  but 
  is 
  very 
  slight, 
  as 
  early 
  striae 
  hav- 
  

   ing 
  the 
  direction 
  of 
  the 
  axes 
  of 
  the 
  chatters 
  are 
  not 
  obliterated. 
  

   Commonly 
  there 
  is 
  some 
  evidence 
  along 
  the 
  axial 
  line 
  of 
  the 
  pres- 
  

   sure 
  by 
  the 
  unsteady 
  or 
  chattering 
  tool. 
  

  

  The 
  other 
  class 
  of 
  fractures, 
  having 
  the 
  concavity 
  facing 
  upstream 
  

   toward 
  the 
  tool, 
  are 
  much 
  less 
  regular 
  or 
  true 
  than 
  the 
  chatter 
  frac- 
  

   tures. 
  In 
  both 
  classes 
  the 
  cracks 
  dip 
  downstream 
  or 
  away 
  from 
  the 
  

   point 
  of 
  the 
  tool, 
  but 
  in 
  these 
  gouge 
  fractures 
  the 
  angle 
  of 
  dip 
  is 
  

   much 
  less 
  than 
  in 
  the 
  chatters, 
  and 
  commonly 
  there 
  is 
  considerable 
  

   flaking 
  of 
  the 
  rock 
  or 
  removal 
  of 
  the 
  feather 
  edges 
  of 
  the 
  surface 
  

   rock. 
  These 
  cracks 
  fall 
  in 
  the 
  class 
  of 
  " 
  concentric 
  gouges 
  " 
  or 
  

   '' 
  disruptive 
  gouges 
  " 
  of 
  earlier 
  writers.^ 
  The 
  action 
  seems 
  to 
  have 
  

   been 
  a 
  sort 
  of 
  drag 
  or 
  pull 
  on 
  the 
  surface 
  of 
  the 
  rock 
  by 
  pressure 
  

   of 
  a 
  boulder 
  with 
  broad 
  area 
  of 
  contact, 
  but 
  without 
  pounding 
  or 
  

   percussive 
  force. 
  The 
  process 
  was 
  a 
  plucking 
  by 
  dragging 
  pressure. 
  

  

  These 
  gougings 
  are 
  not 
  as 
  common 
  as 
  the 
  chatters, 
  and 
  only 
  two 
  

   good 
  localities 
  were 
  noted. 
  One 
  of 
  these 
  is 
  }i 
  mile 
  south 
  of 
  the 
  

   county 
  line 
  between 
  Jefferson 
  and 
  St 
  Lawrence 
  counties, 
  on 
  the 
  west 
  

   road 
  to 
  Chippewa 
  Bay. 
  The 
  other 
  occurrence 
  is 
  on 
  the 
  road 
  east 
  of 
  

   Goose 
  bay 
  and 
  on 
  the 
  south 
  side 
  of 
  Crooked 
  creek 
  valley. 
  The 
  

   first 
  mentioned 
  is 
  on 
  the 
  south 
  end 
  of 
  a 
  plain, 
  the 
  latter 
  on 
  a 
  sur- 
  

   face 
  facing 
  north, 
  where 
  the 
  ice 
  was 
  pushing 
  against 
  an 
  upslope. 
  

  

  The 
  gouge 
  fractures 
  are 
  rarely 
  true 
  circular 
  curves, 
  in 
  which 
  cases 
  

   they 
  may 
  be 
  mistaken 
  for 
  chatters, 
  but 
  commonly 
  they 
  are 
  irregular 
  

  

  1 
  A 
  full 
  description 
  and 
  discussion 
  of 
  these 
  singular 
  phenomena 
  con- 
  

   nected 
  with 
  glacier 
  mechaijics 
  is 
  given 
  in 
  Professor 
  Chamberlin's 
  paper 
  

   Rock 
  Scoring 
  of 
  the 
  Great 
  Ice 
  Invasion. 
  U. 
  S. 
  Geol. 
  Sur. 
  An. 
  Rep't 
  1888. 
  

   p. 
  216-40. 
  Reference 
  to 
  other 
  writings 
  is 
  there 
  given. 
  

  

  6 
  

  

  