﻿rl34 
  

  

  NEW 
  TOBK 
  STATE 
  MUSEUM 
  

  

  Fi 
  g. 
  2 
  

  

  Of 
  course, 
  to 
  a 
  certain 
  extent, 
  the 
  latter 
  cause 
  must 
  have 
  had 
  an 
  

   influence, 
  but 
  I 
  am 
  inclined 
  to 
  believe 
  that 
  the 
  drift 
  in 
  the 
  center 
  

   was 
  never 
  a 
  great 
  deal 
  deeper 
  than 
  at 
  present 
  

  

  There 
  must 
  have 
  been 
  a 
  current 
  of 
  water 
  under 
  the 
  final 
  tongue 
  

   of 
  ice 
  extending 
  up 
  the 
  valley, 
  and 
  this 
  would 
  have 
  tended 
  

   (according 
  to 
  its 
  strength) 
  to 
  keep 
  the 
  center 
  more 
  free 
  from 
  drift. 
  

   As 
  the 
  ice 
  tongue 
  retreated 
  down 
  the 
  valley 
  this 
  stream 
  must 
  have 
  

   entered 
  a 
  lake 
  bounded 
  by 
  the 
  ice 
  at 
  one 
  end 
  and 
  the 
  moraine 
  at 
  

   the 
  other. 
  Thus 
  a 
  continuous 
  delta 
  would 
  he 
  formed 
  and 
  would 
  

   tend 
  to 
  deepen 
  the 
  center 
  deposit. 
  But 
  there 
  are 
  signs 
  of 
  a 
  rapid 
  

   retreat 
  of 
  the 
  ice, 
  so 
  this 
  delta 
  may 
  not 
  have 
  had 
  time 
  to 
  completely 
  

   level 
  up 
  the 
  topography. 
  It 
  may 
  exist 
  to 
  a 
  greater 
  or 
  less 
  extent 
  ; 
  

   we 
  have 
  no 
  means 
  of 
  knowing. 
  

  

  Again, 
  there 
  would 
  be 
  considerable 
  lateral 
  morainal 
  material 
  

   formed 
  on 
  the 
  sides 
  of 
  the 
  ice-tongue 
  from 
  the 
  hills 
  above, 
  and 
  on 
  

   the 
  melting 
  of 
  the 
  ice, 
  this 
  would 
  be 
  deposited 
  along 
  the 
  sides 
  of 
  the 
  

   valley. 
  

  

  The 
  top 
  of 
  the 
  moraine 
  is 
  at 
  Spencer 
  summit 
  where 
  it 
  forms 
  the 
  

   divide 
  between 
  Cayuga 
  lake 
  valley 
  on 
  the 
  north 
  and 
  the 
  valley 
  of 
  

   the 
  Susquehanna 
  river 
  on 
  the 
  south, 
  the 
  walls 
  of 
  these 
  two 
  valleys 
  

   being 
  continuous. 
  

  

  