﻿606 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  to 
  Mont 
  auk 
  point/ 
  but 
  they 
  are 
  usually 
  much 
  worn 
  and 
  scratched 
  

   and 
  have 
  evidently 
  been 
  transported 
  from 
  some 
  distant 
  source. 
  

   The 
  clays 
  at 
  Center 
  island, 
  West 
  neck, 
  Fresh 
  pond 
  and 
  Fisher's 
  

   island 
  are 
  very 
  similar 
  in 
  appearance 
  and 
  composition, 
  and 
  are 
  very 
  

   probably 
  of 
  the 
  same, 
  age, 
  possibly 
  Tertiary,^ 
  but 
  we 
  lack 
  paleon- 
  

   tologic 
  or 
  stratigraphic 
  evidence. 
  At 
  West 
  neck 
  the 
  clay 
  under- 
  

   lies 
  the 
  yellow 
  gravel 
  and 
  the 
  latter 
  is 
  covered 
  by 
  the 
  drift, 
  so 
  that 
  

   is 
  Prepleistocene. 
  

  

  The 
  theory 
  has 
  been 
  put 
  forth 
  that 
  the 
  Cretaceous 
  formation 
  

   on 
  Long 
  Island 
  would 
  be 
  found 
  north 
  of 
  a 
  line 
  joining 
  the 
  southern 
  

   border 
  of 
  the 
  Cretaceous 
  formation 
  of 
  'New 
  Jersey 
  and 
  Marthas 
  

   Vineyard,-^ 
  and 
  that 
  outcrops 
  south 
  of 
  this 
  might 
  be 
  Tertiary; 
  in 
  

   view, 
  however, 
  of 
  determining 
  the 
  clay 
  at 
  Littleneck 
  near 
  i^orth- 
  

   port 
  to 
  be 
  Cretaceous, 
  we 
  must 
  abandon 
  this 
  theory. 
  

  

  An 
  interesting 
  phenomenon 
  is 
  the 
  tilting 
  and 
  crumpling 
  of 
  the 
  

   strata 
  on 
  the 
  north 
  shore 
  of 
  Long 
  Island. 
  This 
  disturbance 
  is 
  

   specially 
  well 
  shown 
  on 
  West 
  neck, 
  and 
  was 
  considered 
  by 
  Dr 
  

   Merrill 
  to 
  be 
  due 
  to 
  the 
  pressure 
  of 
  the 
  advancing 
  ice 
  sheet,^ 
  which 
  

   excavated 
  the 
  deep 
  narrow 
  bays 
  and 
  pushed 
  the 
  excavated 
  material 
  

   into 
  high 
  hills 
  at 
  their 
  head. 
  Dr 
  Merrill's 
  views 
  have 
  been 
  recently 
  

   corroborated 
  in 
  a 
  paper 
  on 
  " 
  The 
  deformation 
  of 
  portions 
  of 
  the 
  

   Atlantic 
  coast 
  plain," 
  by 
  A. 
  HoUick,* 
  who, 
  in 
  disputing 
  the 
  possible 
  

   erogenic 
  origin 
  of 
  these 
  folds, 
  calls 
  attention 
  to 
  the 
  fact 
  that 
  they 
  

   are 
  found 
  only 
  along 
  the 
  line 
  of 
  the 
  moraine, 
  and 
  that 
  the 
  beds 
  are 
  

   disturbed 
  only 
  to 
  a 
  certain 
  'depth. 
  The 
  disturbance 
  is 
  well 
  shown 
  

   at 
  Glencove, 
  West 
  neck, 
  Freshpond 
  and 
  on 
  Fisher's 
  and 
  Gard- 
  

   iner's 
  islands. 
  It 
  is 
  important, 
  however, 
  not 
  to 
  confound 
  tilting 
  

   of 
  the 
  layers, 
  due 
  to 
  slipping, 
  as 
  is 
  the 
  case 
  on 
  Littleneck 
  near 
  

   Northport, 
  with 
  that 
  produced 
  by 
  the 
  ice-thrust. 
  

  

  1 
  A. 
  Hollick. 
  " 
  Notes 
  on 
  geology 
  of 
  north 
  shore 
  of 
  Long 
  Island," 
  Trans. 
  N. 
  

   Y. 
  acad. 
  sci., 
  13. 
  

  

  2 
  This 
  idea 
  is 
  also 
  expressed 
  by 
  Dr 
  Merrill. 
  

  

  3 
  " 
  Geology 
  of 
  Long 
  Island." 
  Ann. 
  N. 
  Y. 
  acad. 
  sci. 
  1884. 
  

   ^'Trans. 
  N. 
  Y. 
  acad. 
  sci., 
  14. 
  

  

  