﻿

  THE 
  GEOLOGICAL 
  HISTORY 
  OF 
  NEW 
  YORK 
  STATE 
  117 
  

  

  the 
  bones 
  of 
  walruses 
  and 
  whales, 
  have 
  been 
  found 
  at 
  altitudes 
  of 
  

   about 
  400 
  feet 
  near 
  the 
  southern 
  end 
  of 
  Lake 
  Champlain, 
  to 
  500 
  

   feet 
  at 
  its 
  northern 
  end, 
  and 
  600 
  or 
  more 
  feet 
  at 
  the 
  eastern 
  end 
  

   of 
  Lake 
  Ontario. 
  In 
  the 
  lower 
  Hudson 
  river 
  valley 
  the 
  deposits 
  

   of 
  this 
  age 
  are 
  about 
  70 
  feet 
  above 
  sea 
  level, 
  and 
  at 
  Albany 
  a 
  little 
  

   over 
  300 
  feet. 
  The 
  altitudes 
  of 
  these 
  so-called 
  raised 
  beaches 
  show 
  

   how 
  much 
  lower 
  the 
  land 
  was 
  during 
  the 
  time 
  of 
  greatest 
  sub- 
  

   mergence, 
  and 
  that 
  the 
  subsidence 
  was 
  most 
  toward 
  the 
  north. 
  

  

  The 
  most 
  recent 
  movement 
  of 
  the 
  earth's 
  crust 
  over 
  the 
  area 
  

   of 
  the 
  State 
  was 
  the 
  very 
  recent 
  gradual 
  elevation 
  which 
  expelled 
  

   the 
  Champlain 
  sea 
  and 
  left 
  the 
  land 
  at 
  its 
  present 
  altitude. 
  The 
  

   altitudes 
  of 
  the 
  raised 
  Champlain 
  beaches 
  show 
  that 
  the 
  greatest 
  

   elevation 
  was 
  on 
  the 
  north. 
  The 
  warping 
  of 
  the 
  Iroquois 
  beaches 
  

   already 
  described 
  occurred 
  at 
  this 
  same 
  time. 
  Actual 
  surveys 
  dur- 
  

   ing 
  the 
  past 
  century 
  have 
  proved 
  that 
  the 
  upward 
  movement 
  in 
  the 
  

   northern 
  Great 
  Lakes 
  region 
  is 
  still 
  progressing 
  at 
  the 
  rate 
  of 
  5 
  

   inches 
  in 
  100 
  miles 
  in 
  100 
  years. 
  

  

  

  