﻿18 
  W. 
  ZTpham 
  — 
  Cham/plain 
  Subsidence, 
  etc. 
  

  

  extent 
  inward 
  to 
  the 
  areas 
  on 
  which 
  its 
  waning 
  remnants 
  

   lingered 
  the 
  latest. 
  

  

  On 
  the 
  Green 
  Mountains 
  of 
  Vermont, 
  the 
  White 
  Mountains 
  

   region, 
  and 
  indeed 
  probably 
  over 
  a 
  large 
  part 
  of 
  New 
  England, 
  

   a 
  tract 
  of 
  the 
  departing 
  ice-sheet 
  remained 
  after 
  the 
  access 
  'of 
  

   the 
  sea 
  to 
  the 
  St. 
  Lawrence 
  basin 
  left 
  the 
  New 
  England 
  ice 
  as 
  

   an 
  isolated 
  mass. 
  This 
  is 
  known 
  by 
  the 
  large 
  tribute 
  of 
  strati- 
  

   fied 
  drift 
  quickly 
  brought 
  by 
  streams 
  from 
  the 
  melting 
  ice 
  of 
  

   the 
  Green 
  Mountains 
  area 
  and 
  deposited 
  as 
  gravel 
  and 
  sand 
  

   deltas 
  and 
  offshore 
  clays 
  of 
  the 
  Winooski, 
  LaMoille, 
  and 
  Mis- 
  

   sisquoi 
  rivers, 
  described 
  by 
  Hitchcock 
  and 
  Baldwin, 
  in 
  the 
  

   east 
  border 
  of 
  the 
  Champlain 
  arm 
  of 
  the 
  sea. 
  On 
  the 
  west, 
  

   too, 
  a 
  considerable 
  remnant 
  of 
  the 
  ice-sheet 
  seems 
  to 
  have 
  

   remained 
  unmelted 
  until 
  this 
  time 
  on 
  the 
  Adirondacks, 
  and 
  to 
  

   have 
  likewise 
  supplied 
  the 
  deltas 
  and 
  marine 
  clays 
  of 
  the 
  An 
  

   Sable, 
  Saranac, 
  and 
  Chazy 
  rivers 
  in 
  New 
  York. 
  Deflections 
  

   of 
  glacial 
  striation 
  down 
  the 
  valleys, 
  with 
  corresponding 
  drift 
  

   transportation 
  and 
  formation 
  of 
  local 
  moraines 
  across 
  some 
  of 
  

   the 
  mountain 
  valleys, 
  have 
  been 
  recorded 
  by 
  Hitchcock, 
  Stone, 
  

   and 
  others, 
  in 
  Vermont 
  and 
  New 
  Hampshire 
  ; 
  but 
  the 
  time 
  

   allowed 
  for 
  such 
  glacial 
  action, 
  under 
  the 
  warm 
  Champlain 
  

   climate, 
  was 
  very 
  short. 
  The 
  earlier 
  melting 
  of 
  the 
  ice 
  along 
  

   the 
  St. 
  Lawrence 
  valley 
  than 
  on 
  these 
  mountain 
  tracts 
  was 
  due 
  

   on 
  one 
  side 
  to 
  the 
  laving 
  action 
  of 
  the 
  waves 
  of 
  Lakes 
  Iroquois 
  

   and 
  St. 
  Lawrence, 
  and 
  on 
  the 
  other 
  side 
  to 
  the 
  washing 
  of 
  the 
  

   ice-cliffs 
  by 
  the 
  fast 
  encroaching 
  sea 
  in 
  the 
  Gulf 
  of 
  St. 
  Law- 
  

   rence, 
  until 
  at 
  last 
  near 
  Quebec 
  the 
  barrier 
  was 
  severed. 
  

  

  From 
  the 
  Champlain 
  submergence 
  our 
  Atlantic 
  coast 
  was 
  

   raised 
  somewhat 
  higher 
  than 
  now 
  ; 
  and 
  its 
  latest 
  movement 
  

   from 
  New 
  Jersey 
  to 
  southern 
  Greenland 
  has 
  been 
  a 
  moderate 
  

   depression. 
  The 
  vertical 
  amount 
  of 
  this 
  postglacial 
  elevation 
  

   above 
  the 
  present 
  height, 
  and 
  of 
  the 
  recent 
  subsidence, 
  on 
  all 
  

   the 
  coast 
  of 
  New 
  Jersey, 
  New 
  England, 
  and 
  the 
  eastern 
  prov- 
  

   inces 
  of 
  Canada, 
  is 
  known 
  to 
  have 
  ranged 
  from 
  10 
  feet 
  to 
  a 
  

   maximum 
  of 
  at 
  least 
  80 
  feet 
  at 
  the 
  head 
  of 
  the 
  Bay 
  of 
  Fundy, 
  

   as 
  is 
  attested 
  in 
  many 
  places 
  by 
  stumps 
  of 
  forests, 
  rooted 
  where 
  

   they 
  grew, 
  and 
  by 
  peat 
  beds 
  now 
  submerged 
  by 
  the 
  sea. 
  As 
  

   in 
  Scandinavia, 
  the 
  restoration 
  of 
  isostatic 
  equilibrium 
  is 
  at- 
  

   tended 
  by 
  minor 
  oscillations, 
  the 
  conditions 
  requisite 
  for 
  repose 
  

   having 
  been 
  overpassed 
  by 
  the 
  early 
  reelevation 
  of 
  outer 
  por- 
  

   tions 
  of 
  each 
  of 
  these 
  great 
  glaciated 
  areas. 
  The 
  close 
  of 
  the 
  

   Ice 
  age 
  was 
  not 
  long 
  ago, 
  geologically 
  speaking, 
  for 
  equilibrium 
  

   of 
  the 
  disturbed 
  areas 
  has 
  not 
  yet 
  been 
  restored. 
  

  

  