﻿648 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  this 
  time 
  very 
  irregular 
  in 
  outline 
  as 
  compared 
  with 
  the 
  crest 
  of 
  the 
  

   inner 
  moraine 
  [see 
  pi. 
  9).^ 
  

  

  As 
  the 
  land, 
  on 
  the 
  south 
  of 
  the 
  Port 
  Washington 
  stage, 
  on 
  the 
  

   Oyster 
  Bay 
  quadrangle 
  everywhere 
  in 
  the 
  moraine 
  rises 
  to 
  levels 
  

   higher 
  than 
  80 
  feet 
  above 
  the 
  present 
  sealevel 
  but 
  is 
  open 
  to 
  the 
  

   west, 
  the 
  nature 
  of 
  the 
  body 
  of 
  water 
  in 
  which 
  the 
  deltas 
  at 
  this 
  

   stage 
  were 
  built 
  — 
  whether 
  fresh 
  water 
  or 
  sea 
  water 
  — 
  must 
  be 
  

   determined 
  by 
  observations 
  drawn 
  from 
  outside 
  the 
  district. 
  Witli 
  

   this 
  point 
  in 
  mind, 
  the 
  following 
  notes 
  from 
  the 
  Harlem 
  and 
  Brook- 
  

   lyn 
  sheets 
  tlu'ow 
  light 
  on 
  the 
  glacial 
  history 
  of 
  this 
  area. 
  

   Harlem 
  and 
  Brooklyn 
  quadrangles 
  

  

  For 
  the 
  purpose 
  of 
  comparison 
  and 
  in 
  order 
  to 
  follow 
  out 
  to 
  some 
  

   dehnite 
  conclusion 
  the 
  problems 
  arising 
  on 
  the 
  area 
  heretofore 
  dealt 
  

   with, 
  a 
  reconnaissance 
  was 
  made 
  of 
  the 
  region 
  on 
  the 
  west. 
  The 
  

   questions 
  which 
  have 
  thus 
  far 
  arisen 
  are 
  the 
  distinction 
  between 
  the 
  

   inner 
  and 
  the 
  outer 
  moraine, 
  the 
  nature 
  of 
  the 
  water 
  body 
  in 
  which 
  

   the 
  Port 
  Washington 
  delta 
  was 
  deposited, 
  and 
  incidentally 
  the 
  rea- 
  

   son 
  for 
  the 
  diversion 
  of 
  glacial 
  drainage 
  on 
  the 
  outwash 
  plain 
  into 
  

   Jamaica 
  bay. 
  

  

  It 
  has 
  been 
  shown 
  how 
  the 
  "inner 
  " 
  moraine 
  becomes 
  the 
  

   principal 
  and 
  outer 
  moraine 
  west 
  of 
  Roslyn. 
  From 
  this 
  vicinity, 
  

   particularly 
  near 
  Hollis, 
  to 
  the 
  western 
  limit 
  of 
  the 
  island 
  the 
  aline- 
  

   ment 
  of 
  the 
  front 
  of 
  the 
  moraine 
  at 
  its 
  merging 
  into 
  the 
  sand 
  plain 
  

   is 
  strikingly 
  uniform 
  in 
  direction. 
  From 
  2 
  to 
  3 
  miles 
  east 
  and 
  

   west 
  of 
  Jamaica 
  this 
  line 
  certainly 
  is 
  suggestive 
  of 
  an 
  ancient 
  shore 
  

   line, 
  now 
  at 
  about 
  80 
  feet 
  above 
  the 
  sealevel. 
  

  

  A 
  number 
  of 
  newly 
  cut 
  streets 
  expose 
  the 
  glacial 
  deposits 
  along 
  

   this 
  line, 
  particularly 
  on 
  the 
  crest 
  and 
  frontal 
  slope 
  of 
  the 
  moraine 
  

   in 
  the 
  vicinity 
  of 
  Jamaica. 
  The 
  moraine 
  near 
  the 
  front 
  is 
  composed 
  

   of 
  till 
  with 
  medium-sized 
  boulders, 
  often 
  passing 
  into 
  an 
  ill 
  strati- 
  

   fied, 
  contorted 
  drift, 
  with 
  lenses 
  of 
  till 
  and 
  gravel, 
  the 
  topography 
  

   of 
  the 
  whole 
  being 
  of 
  the 
  knob 
  and 
  basin 
  type. 
  

  

  The 
  frontal 
  slope 
  of 
  the 
  moraine 
  inclines 
  from 
  15° 
  to 
  20°, 
  an 
  

  

  ^ 
  On 
  the 
  colored 
  geological 
  map 
  accompanying 
  this 
  report, 
  the 
  deposit 
  at 
  Great 
  

   Neck 
  village 
  is 
  not 
  discriminated 
  from 
  the 
  older 
  Manhasset 
  sands 
  for 
  the 
  reason 
  

   that 
  no 
  section 
  of 
  the 
  deposit 
  was 
  obtainable. 
  

  

  