﻿66 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  at 
  once 
  that 
  during 
  the 
  time 
  of 
  maximum 
  subsidence 
  the 
  region 
  

   stood 
  several 
  hundred 
  feet 
  lower 
  than 
  now, 
  and 
  that 
  the 
  most 
  

   recent 
  land 
  movement 
  has 
  been 
  one 
  of 
  elevation 
  which 
  has 
  brought 
  

   the 
  marine 
  deposits 
  to 
  their 
  present 
  position 
  several 
  hundred 
  feet 
  

   above 
  sea 
  level. 
  This 
  last 
  (upward) 
  movement 
  has 
  a 
  direct 
  bear- 
  

   ing 
  upon 
  the 
  glacial 
  lake 
  deposits 
  of 
  the 
  North 
  Creek 
  quadrangle, 
  

   and 
  it 
  is 
  important 
  to 
  note 
  that 
  this 
  upward 
  movement 
  was 
  dif- 
  

   ferential 
  with 
  greatest 
  uplift 
  toward 
  the 
  north. 
  Using 
  the 
  figures 
  

   of 
  Professor 
  Woodworth, 
  the 
  greater 
  uplift 
  of 
  the 
  land 
  toward 
  

   the 
  north, 
  passing 
  along 
  the 
  southern 
  part 
  of 
  the 
  Champlain 
  val- 
  

   ley, 
  has 
  amounted 
  to 
  about 
  3^ 
  feet 
  a 
  mile. 
  1 
  Practically 
  this 
  same 
  

   figure 
  may 
  be 
  applied 
  to 
  the 
  North 
  Creek 
  area 
  since 
  it 
  is 
  so 
  close 
  to 
  

   the 
  southern 
  end 
  of 
  the 
  Champlain 
  valley. 
  

  

  DIRECTION 
  OF 
  ICE 
  FLOW 
  

  

  The 
  evidence 
  is 
  conclusive 
  that 
  the 
  North 
  Creek 
  quadrangle 
  was 
  

   vigorously 
  glaciated. 
  Many 
  widely 
  distributed 
  glacial 
  striae 
  ■ 
  — 
  

   sixty 
  in 
  all 
  — 
  have 
  been 
  observed 
  within 
  the 
  map 
  limits 
  and 
  are 
  

   all 
  recorded 
  on 
  the 
  geologic 
  map. 
  Such 
  a 
  large 
  number 
  of 
  striae 
  

   is 
  very 
  unusual, 
  certainly 
  being 
  far 
  greater 
  than 
  for 
  any 
  other 
  

   quadrangle 
  so 
  far 
  mapped 
  in 
  the 
  eastern, 
  central, 
  or 
  southern 
  Ad- 
  

   irondacks. 
  As 
  usual 
  the 
  striae 
  are 
  most 
  frequently 
  seen 
  along 
  the 
  

   highways 
  in 
  the 
  valleys 
  and 
  on 
  ledges 
  from 
  which 
  the 
  glacial 
  drift 
  

   covering 
  has 
  recently 
  been 
  removed. 
  A 
  number 
  of 
  striae 
  have 
  

   been 
  found 
  away 
  from 
  the 
  roads 
  and 
  even 
  on 
  mountain 
  sides, 
  but 
  

   never 
  on 
  mountain 
  tops 
  because 
  where 
  exposed 
  on 
  the 
  bare 
  ledges 
  

   they 
  have 
  been 
  obliterated 
  by 
  postglacial 
  weathering. 
  

  

  Of 
  the 
  sixty 
  recorded 
  striae, 
  the 
  extreme 
  range 
  in 
  direction 
  is 
  

   only 
  from 
  south 
  20 
  east 
  to 
  south 
  20 
  west, 
  with 
  the 
  north-south 
  

   direction 
  nearly 
  an 
  average. 
  In 
  fact 
  many 
  of 
  the 
  striae 
  do 
  run 
  

   north-south 
  and 
  very 
  few 
  vary 
  more 
  than 
  io° 
  either 
  side 
  of 
  this. 
  

   The 
  direction 
  of 
  ice 
  movement 
  indicated 
  by 
  these 
  striae 
  is 
  excep- 
  

   tional 
  for 
  the 
  central 
  and 
  eastern 
  Adirondacks 
  as 
  judged 
  by 
  obser- 
  

   vations 
  made 
  on 
  the 
  Long 
  lake, 
  Paradox 
  lake, 
  and 
  Elizabethtown- 
  

   Port 
  Henry 
  sheets 
  over 
  which 
  areas 
  the 
  general 
  movement 
  was 
  

   southwestward 
  at 
  the 
  time 
  of 
  maximum 
  glaciation. 
  The 
  reason 
  

   for 
  the 
  southward 
  movement 
  over 
  the 
  North 
  Creek 
  sheet 
  is 
  not 
  

   an 
  easy 
  thing 
  to 
  account 
  for, 
  though 
  it 
  may 
  possibly 
  have 
  been 
  due 
  

   to 
  a 
  crowding 
  of 
  the 
  ice 
  into 
  the 
  Hudson 
  valley 
  and 
  a 
  local 
  deflec- 
  

   tion 
  of 
  the 
  general 
  southwesterly 
  current 
  where 
  the 
  ice 
  flowed 
  

  

  1 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  84, 
  p. 
  206, 
  228 
  and 
  plate 
  28. 
  

  

  