﻿642 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  a 
  deposit 
  which 
  is 
  almost 
  everywhere 
  in 
  its 
  extent 
  more 
  massive 
  

   than 
  the 
  outer 
  moraine. 
  

  

  The 
  writer 
  is 
  led 
  by 
  his 
  observations 
  of 
  the 
  two 
  moraines 
  on 
  Long 
  

   Island 
  to 
  dissent 
  from 
  this 
  long 
  accepted 
  opinion, 
  and 
  to 
  regard 
  the 
  

   inner 
  moraine 
  as 
  continuous 
  westward 
  of 
  Port 
  Jefferson 
  to 
  the 
  vicinity 
  

   of 
  Coldspring 
  and 
  Syosset, 
  where 
  the 
  two 
  moraines 
  nearly 
  coalesce. 
  

   They 
  maintain 
  their 
  relative 
  positions 
  with 
  some 
  distinctness 
  to 
  the 
  

   vicinity 
  of 
  Roslyn, 
  where 
  the 
  inner 
  moraine 
  crosses 
  the 
  outer 
  

   moraine, 
  the 
  latter 
  disappearing 
  beneath 
  the 
  later 
  one, 
  wliich 
  con- 
  

   tinues 
  onward 
  to 
  the 
  western 
  end 
  of 
  the 
  island 
  and 
  becomes 
  the 
  

   terminal 
  moraine 
  of 
  the 
  mainland. 
  Tlie 
  tracing 
  of 
  the 
  two 
  moraines 
  

   made 
  in 
  the 
  fall 
  of 
  1900 
  by 
  J. 
  E. 
  Woodman 
  served 
  to 
  show 
  the 
  

   extension 
  of 
  the 
  inner 
  moraine 
  to 
  the 
  southwest 
  of 
  Port 
  Jefferson 
  

   on 
  to 
  the 
  eastern 
  limits 
  of 
  the 
  Oyster 
  Bay 
  quadrangle. 
  

  

  This 
  interpretation 
  of 
  the 
  westward 
  extension 
  of 
  the 
  two 
  moraines 
  

   is 
  quite 
  in 
  line 
  with 
  the 
  observed 
  tendency 
  of 
  the 
  ice 
  front 
  along 
  the 
  

   southern 
  coast 
  from 
  the 
  easternmost 
  point 
  in 
  Massachusetts 
  to 
  the 
  

   Hudson 
  river. 
  On 
  the 
  east 
  the 
  moraines 
  of 
  Nantucket 
  and 
  Cape 
  

   Cod 
  are 
  at 
  the 
  outer 
  margin 
  of 
  these 
  two 
  lobes 
  more 
  than 
  25 
  miles 
  

   apart. 
  In 
  the 
  region 
  of 
  Vineyard 
  sound 
  they 
  are 
  from 
  5 
  to 
  10 
  

   miles 
  apart 
  ; 
  they 
  are 
  quite 
  10 
  miles 
  apart 
  in 
  the 
  meridian 
  of 
  Block 
  

   island 
  ; 
  when 
  they 
  reappear 
  on 
  Long 
  Island, 
  they 
  approach 
  each 
  

   other. 
  West 
  of 
  Poslyn, 
  the 
  second 
  moraine 
  crosses 
  the 
  first. 
  From 
  

   this 
  it 
  is 
  concluded 
  that 
  the 
  inner 
  moraine 
  is 
  not 
  so 
  much 
  a 
  reces- 
  

   sional 
  moraine 
  as 
  a 
  frontal 
  moraine 
  built 
  after 
  a 
  retreat 
  from 
  the 
  

   position 
  of 
  the 
  first 
  moraine, 
  followed 
  by 
  an 
  advance 
  to 
  the 
  position 
  

   of 
  the 
  second 
  moraine, 
  accompanied 
  in 
  the 
  Hudson 
  valley 
  by 
  a 
  

   greater 
  outrun 
  of 
  the 
  ice 
  sheet 
  than 
  in 
  the 
  first 
  advance. 
  This 
  

   overlapping 
  of 
  moraines 
  is 
  a 
  well 
  attested 
  phenomenon 
  in 
  the 
  region 
  

   south 
  of 
  the 
  great 
  lakes. 
  

  

  The 
  ice 
  front 
  which 
  rested 
  against 
  the 
  north 
  coast 
  of 
  Long 
  Island 
  

   in 
  the 
  vicinity 
  of 
  Port 
  Washington 
  can 
  not 
  well 
  be 
  the 
  same 
  as 
  that 
  

   whose 
  moraine 
  caps 
  the 
  cliff's 
  east 
  of 
  Port 
  Jefferson. 
  In 
  the 
  first 
  

   place, 
  at 
  Port 
  Washington 
  the 
  morainal 
  accumulations 
  are 
  very 
  

   slight 
  indeed 
  and 
  do 
  not 
  rise 
  in 
  mounds 
  ; 
  in 
  the 
  second 
  place, 
  the 
  

   ice 
  sheet 
  halted 
  there 
  for 
  a 
  brief 
  time 
  only, 
  as 
  is 
  witnessed 
  by 
  the 
  

   small 
  amount 
  of 
  outwash 
  in 
  the 
  sand 
  plain 
  at 
  that 
  locality. 
  This 
  

  

  