﻿NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  time 
  of 
  maximum 
  glaciation, 
  and 
  also 
  the 
  three 
  great 
  centers 
  of 
  

   accumulation 
  and 
  dispersal 
  of 
  the 
  ice. 
  The 
  directions 
  of 
  flow 
  of 
  

   the 
  ice 
  from 
  these 
  centers 
  have 
  been 
  determined 
  by 
  the 
  study 
  of 
  

   the 
  directions 
  of 
  a 
  very 
  large 
  number 
  of 
  glacial 
  striae 
  or 
  scratches. 
  

  

  Fig. 
  29 
  Map 
  of 
  North 
  America 
  showing 
  the 
  maximum 
  extent 
  of 
  the 
  

   great 
  ice 
  sheets 
  of 
  the 
  Quaternary 
  period. 
  The 
  three 
  great 
  ice 
  centers 
  are 
  

   shown 
  by 
  the 
  letters 
  as 
  follows 
  : 
  L 
  = 
  Laborador 
  or 
  Laurentide 
  Glacier 
  ; 
  

   K=Keewatin 
  Glacier; 
  and 
  C 
  = 
  Cordilleran 
  Glacier. 
  All 
  of 
  New 
  York 
  

   State, 
  except 
  probably 
  the 
  very 
  southern 
  border 
  of 
  Long 
  Island 
  and 
  the 
  

   southern 
  part 
  of 
  Cattaraugus 
  county, 
  was 
  buried 
  under 
  the 
  ice. 
  

  

  It 
  was 
  the 
  Labradorean 
  or 
  Laurentide 
  ice 
  sheet 
  which 
  spread 
  south- 
  

   ward 
  over 
  New 
  York 
  to 
  cover 
  all 
  the 
  State 
  except 
  the 
  southern 
  

   border 
  of 
  Long 
  Island. 
  It 
  must 
  of 
  course 
  be 
  remembered 
  that 
  the 
  

  

  