﻿CLAYS 
  OF 
  NEW 
  YORK 
  585 
  

  

  for 
  this 
  locality 
  is 
  250 
  feet 
  above 
  the 
  level 
  of 
  the 
  Hudson 
  river. 
  

   On 
  either 
  side 
  of 
  the 
  track 
  at 
  Thiells 
  are 
  probably 
  remnants 
  of 
  a 
  

   terrace. 
  

  

  The 
  clay 
  bank 
  of 
  the 
  Anchor 
  brick 
  co. 
  at 
  Croton 
  landing 
  is 
  

   elliptic 
  in 
  outline 
  and 
  lies 
  on 
  a 
  bed 
  of 
  granite, 
  gneiss, 
  schist, 
  and 
  

   white 
  crystalline 
  limestone 
  pebbles, 
  cemented 
  together 
  by 
  clay, 
  

   covered 
  with 
  limonite. 
  Large 
  pebbles 
  are 
  scattered 
  through 
  the 
  

   clay, 
  the 
  layers 
  of 
  which 
  are 
  undulating, 
  conforming 
  to 
  the 
  shape 
  

   of 
  the 
  underlying 
  surface. 
  Over 
  the 
  clay 
  is 
  4 
  to 
  6 
  feet 
  of 
  gravel 
  

   and 
  sand. 
  South 
  of 
  this 
  yard 
  an 
  excavation 
  has 
  been 
  made 
  under 
  

   the 
  terrace 
  for 
  obtaining 
  gravel, 
  exposing 
  a 
  section 
  of 
  Croton 
  delta. 
  

   Projecting 
  up 
  into 
  it 
  is 
  a 
  mass 
  of 
  boulder-till. 
  

  

  About 
  the 
  middle 
  of 
  Croton 
  point 
  are 
  the 
  clay 
  pits 
  of 
  the 
  Under- 
  

   hill 
  brick 
  co. 
  Their 
  clay 
  is 
  overlain 
  by 
  the 
  sandy 
  beds 
  of 
  Croton 
  

   delta. 
  The 
  material 
  composing 
  it 
  was 
  evidently 
  derived 
  from 
  the 
  

   crystalline 
  rocks 
  of 
  the 
  surrounding 
  country. 
  It 
  is 
  often 
  micaceous 
  

   and 
  of 
  a 
  yellow 
  color. 
  Scattered 
  through 
  this 
  sand 
  are 
  great 
  num- 
  

   bers 
  of 
  botryoidal 
  sand 
  concretions, 
  some 
  of 
  them 
  forming 
  masses 
  

   6 
  feet 
  long 
  and 
  3 
  to 
  4 
  feet 
  wide. 
  They 
  show 
  the 
  layers 
  of 
  deposi- 
  

   tion 
  of 
  the 
  aand. 
  

  

  The 
  clay 
  at 
  Crugers, 
  Montrose 
  and 
  Yerplanck 
  lies 
  in 
  hollows 
  

   in 
  the 
  rock, 
  being 
  as 
  much 
  as 
  50 
  feet 
  thick 
  in 
  some 
  places. 
  At 
  

   Crugers 
  it 
  is 
  overlain 
  by 
  a 
  few 
  feet 
  of 
  loam; 
  at 
  Montrose 
  by 
  

   stratified 
  sand, 
  varying 
  in 
  depth 
  from 
  5 
  to 
  20 
  feet, 
  according 
  to 
  

   borings 
  made. 
  Along 
  the 
  Hudson 
  River 
  railroad 
  track 
  below 
  

   Montrose, 
  at 
  Morton's 
  yard, 
  the 
  clay 
  is 
  overlain 
  by 
  from 
  8 
  to 
  

   10 
  feet 
  of 
  fine 
  gravel, 
  and 
  cross-stratified 
  sand 
  of 
  a 
  dark 
  gray 
  

   or 
  black 
  color. 
  The 
  materials 
  composing 
  it 
  are, 
  to 
  a 
  gi'eat 
  extent, 
  

   ground 
  up 
  crystalline 
  rocks. 
  The 
  same 
  material 
  covers 
  the 
  clay 
  

   at 
  McConnell 
  dz 
  O'Brien's 
  bank. 
  At 
  the 
  clay 
  beds 
  of 
  the 
  Hud- 
  

   son 
  river 
  brick 
  co. 
  at 
  Yerplanck, 
  the 
  clay 
  is 
  covered 
  by 
  yellowish 
  

   sand 
  and 
  fine 
  dark 
  colored 
  gravel; 
  usually 
  they 
  are 
  unstratified, 
  

   but 
  in 
  a 
  few 
  spots 
  show 
  cross-bedding. 
  

  

  A 
  short 
  distance 
  below 
  Peekskill, 
  at 
  Bonner 
  & 
  Cole's 
  yard, 
  is 
  

   a 
  remnant 
  of 
  a 
  20 
  foot 
  ten-ace. 
  There 
  is 
  here 
  a 
  deposit 
  of 
  clay 
  

  

  