﻿PLEISTOCENE 
  GEOLOGY 
  OF 
  NASSAU 
  CO. 
  AND 
  BOROUGH 
  OF 
  QUEENS 
  659" 
  

  

  The 
  position 
  of 
  the 
  ice 
  front 
  is 
  definitely 
  fixed 
  in 
  this 
  field 
  during 
  

   the 
  retreat 
  by 
  certain 
  sandy 
  deltas 
  backed 
  by 
  moraiaal 
  deposits. 
  

   Elsewhere 
  in 
  the 
  retreat 
  from 
  the 
  main 
  moraine, 
  the 
  position 
  of 
  

   the 
  ice 
  front 
  is 
  indefinite. 
  In 
  the 
  hypothesis 
  of 
  glacial 
  lakes 
  held 
  

   in 
  by 
  it, 
  it 
  is 
  placed 
  at 
  certain 
  points 
  so 
  as 
  to 
  control 
  the 
  outlet 
  of 
  

   water 
  bodies 
  or 
  lakes 
  whose 
  level 
  is 
  known. 
  There 
  are 
  in 
  this 
  

   district 
  certain 
  drift 
  ridges 
  which 
  simulate 
  the 
  form 
  and 
  extension 
  

   of 
  the 
  main 
  moraine, 
  and 
  they 
  appear 
  to 
  liave 
  developed 
  in 
  part 
  

   during 
  the 
  retreat 
  from 
  the 
  outer 
  ridge 
  at 
  East 
  New 
  York. 
  Their 
  

   trend 
  and 
  position 
  accord 
  as 
  nearly 
  as 
  might 
  be 
  expected 
  with 
  the 
  

   position 
  of 
  the 
  ice 
  front 
  at 
  the 
  time 
  of 
  the 
  JPort 
  Washington 
  and 
  

   College 
  Point 
  stages. 
  

  

  In 
  a 
  broad 
  sense 
  most 
  of 
  the 
  western 
  part 
  of 
  the 
  island 
  north 
  

   of 
  the 
  moraine 
  is 
  morainal. 
  But 
  it 
  has 
  a 
  distinct 
  aggregation 
  in 
  

   belts 
  rudely 
  parallel 
  to 
  the 
  outer 
  moraine 
  and 
  presumably 
  to 
  the 
  

   ice 
  front 
  as 
  it 
  retreated. 
  Some 
  of 
  the 
  thicker 
  deposits 
  may 
  be 
  due 
  

   to 
  the 
  w^orking 
  over 
  of 
  the 
  moraine 
  whose 
  disappearance 
  beneath 
  

   this 
  later 
  drift 
  at 
  Eoslyn 
  has 
  been 
  noted. 
  

  

  A 
  glance 
  at 
  the 
  contours 
  on 
  the 
  map 
  will 
  show 
  a 
  line 
  of 
  irregu- 
  

   lar, 
  flattish 
  drift 
  hills 
  with 
  hollows 
  lying 
  about 
  2 
  miles 
  -nortli 
  of 
  

   the 
  main 
  moraine. 
  This 
  line 
  is 
  encountered 
  at 
  East 
  Williamsburo;. 
  

   On 
  the 
  north 
  and 
  west 
  of 
  Corona 
  is 
  a 
  curved 
  line 
  of 
  deposits 
  

   highly 
  suggestive 
  of 
  an 
  ice 
  margin, 
  and 
  the 
  phenomena 
  are 
  repeated 
  

   in 
  deposits 
  bending 
  around 
  from 
  East 
  Calvary 
  cemetery 
  near 
  Hun- 
  

   ters 
  northeastward 
  past 
  Ravenswood 
  into 
  Astoria 
  and 
  thence 
  to 
  

   the 
  East 
  river 
  near 
  Sanford 
  point. 
  This 
  line 
  is, 
  again, 
  about 
  2 
  

   miles 
  farther 
  back 
  than 
  the 
  Corona 
  line, 
  and 
  the 
  two 
  bend 
  south- 
  

   westward 
  toward 
  New 
  York 
  bay, 
  as 
  the 
  line 
  might 
  be 
  expected 
  to 
  

   bend 
  if 
  the 
  ice 
  were 
  not 
  completely 
  stagnant 
  along 
  the 
  axis 
  of 
  most 
  

   rapid 
  movement 
  down 
  the 
  Hudson 
  valley. 
  Moreover, 
  the 
  Astoria 
  

   line 
  is 
  apparently 
  a 
  continuation 
  of 
  the 
  College 
  Point 
  frontal 
  

   deposits, 
  and 
  they 
  are 
  so 
  represented 
  by 
  the 
  line 
  drawn 
  on 
  the 
  

   accompanying 
  sketch 
  map 
  (pi. 
  9). 
  The 
  line 
  of 
  the 
  Port 
  Washing- 
  

   ton 
  stage 
  is 
  not 
  so 
  definitely 
  known. 
  Erom 
  Littleneck 
  bay 
  it 
  is 
  

   represented 
  as 
  following 
  the 
  Corona 
  deposits 
  ; 
  it 
  may 
  have 
  rested 
  

   against 
  the 
  drift 
  hills 
  on 
  either 
  side 
  of 
  the 
  southern 
  end 
  of 
  Flush- 
  

   ing 
  bay 
  ; 
  the 
  results 
  are 
  practically 
  tlie 
  same 
  in 
  either 
  view. 
  

  

  