﻿630 
  

  

  NEW 
  YOKK 
  STATE 
  MUSEUM 
  

  

  Pig. 
  4 
  Detail 
  of 
  section 
  just 
  west 
  of 
  pre- 
  

   ceding 
  section. 
  A, 
  sands 
  and 
  gravels; 
  

   B, 
  till; 
  C, 
  loesslike 
  sands 
  inclosing 
  

   boulders 
  

  

  admits 
  a 
  different 
  interpretation, 
  one 
  favoring 
  the 
  dislocation 
  of 
  the 
  

   section 
  before 
  the 
  deposition 
  of 
  the 
  till 
  but 
  on 
  a 
  scale 
  quite 
  admis- 
  

   sible 
  as 
  the 
  work 
  of 
  a 
  glacier. 
  The 
  

   dislocated 
  beds 
  dip 
  at 
  high 
  angles 
  

   to 
  the 
  south. 
  The 
  underlying 
  bhie 
  

   clays 
  weather 
  whitish, 
  carry 
  quartz 
  

   pebbles 
  and 
  slight 
  traces 
  of 
  black 
  

   carbonized 
  plant 
  remains 
  and 
  are 
  

   presumably 
  Potomac 
  or 
  Creta- 
  

   ceous. 
  They 
  are 
  unconformably 
  

   beneath 
  the 
  sands. 
  

   Another 
  dislocated 
  section 
  affect- 
  

   ing 
  sands 
  underlain 
  by 
  clays 
  occurs 
  at 
  the 
  southern 
  end 
  of 
  Center 
  

  

  island 
  (tig. 
  7). 
  The 
  clays 
  are 
  

   here 
  dark 
  blue, 
  well 
  laminated, 
  

   and 
  pass 
  by 
  gradations 
  into 
  the 
  

   overlying 
  sands, 
  recalling 
  many 
  

  

  Fig. 
  5 
  Local 
  section 
  at 
  Rocky 
  point 
  showing 
  . 
  /^ 
  r^ 
  j 
  ^ 
  

  

  deformed 
  blue 
  clays 
  and 
  banded 
  sands, 
  uncon- 
  SectlOnS 
  On 
  Cape 
  Cod 
  bay 
  in 
  

  

  f 
  ormably 
  overlain 
  by 
  till 
  with 
  boulders 
  up 
  to 
  2 
  MaSSachuSCttS. 
  The 
  Upper 
  part 
  

   feet 
  in 
  diameter, 
  passing 
  laterally 
  into 
  strati- 
  ^ 
  ^ 
  ^ 
  

  

  fled 
  gravel 
  of 
  the 
  sands 
  carries 
  boulders; 
  

  

  the 
  whole 
  may 
  well 
  be 
  a 
  basal 
  

   At 
  one 
  point 
  a 
  small 
  fold 
  overturned 
  

   southward 
  has 
  passed 
  into 
  a 
  reverse 
  

   fold-fault. 
  Viewed 
  as 
  an 
  over- 
  

   thrust, 
  the 
  movement 
  has 
  been 
  

   northward. 
  To 
  accord 
  with 
  tlie 
  

   hypothesis 
  of 
  glacial 
  thrust 
  acting 
  

   from 
  the 
  north, 
  it 
  is 
  necessary 
  to 
  

   suppose 
  that 
  underthrusting 
  has 
  

   taken 
  place. 
  

  

  The 
  railroad 
  from 
  Oyster 
  Bay 
  to 
  

   Eoslyn 
  passes 
  through 
  three 
  deep 
  

   cuts 
  in 
  an 
  eastwest 
  valley 
  in 
  Mill 
  

  

  Fig. 
  6 
  Section 
  at 
  headland 
  on 
  south- 
  ^ 
  i. 
  j 
  xi 
  . 
  nparpqt 
  Ov^ter 
  

  

  west 
  of 
  Rocky 
  point. 
  A, 
  clay; 
  B, 
  yei- 
  iNeciJ. 
  in 
  tuc 
  cui 
  nearest 
  Kjysier 
  

   lowish 
  sandstone, 
  with 
  boulders; 
  c, 
  jg^y 
  whitish 
  to 
  pinkish 
  sands, 
  prob- 
  

  

  earthy 
  gravel 
  "^ 
  

  

  ably 
  Cretaceous, 
  appear 
  at 
  the 
  bot- 
  

   tom, 
  succeeded 
  by 
  about 
  30 
  feet 
  of 
  coarse 
  gravels, 
  ill 
  stratified 
  and 
  

  

  portion 
  of 
  the 
  Columbia. 
  

  

  