﻿CLAYS 
  OF 
  NEW 
  YORK 
  589 
  

  

  present 
  day 
  but 
  traces 
  of 
  these 
  deposits 
  remain, 
  and 
  the 
  streams 
  

   which 
  formed 
  them 
  have 
  cut 
  down 
  through 
  them 
  below 
  tide 
  

   level. 
  Dr 
  Merrill 
  thinks 
  it 
  highly 
  probable 
  that 
  these 
  deltas 
  once 
  

   filled 
  a 
  large 
  portion 
  of 
  the 
  valley 
  in 
  the 
  Highlands. 
  At 
  E-oseton, 
  

   as 
  already 
  mentioned, 
  there 
  is 
  a 
  deposit 
  which 
  may 
  have 
  come 
  

   from 
  the 
  delta 
  of 
  Wappinger 
  creek. 
  Also 
  at 
  Jonespoint 
  oppo- 
  

   site 
  Peekskill 
  there 
  is 
  a 
  terrace 
  composed 
  of 
  transported 
  material, 
  

   which 
  Dr 
  Merrill 
  for 
  a 
  while 
  regarded 
  as 
  a 
  portion 
  of 
  Peekskill 
  

   delta; 
  the 
  size 
  of 
  the 
  pebbles 
  composing 
  it 
  caused 
  him 
  to 
  give 
  up 
  

   this 
  view. 
  There 
  is 
  however 
  in 
  the 
  upper 
  portion 
  of 
  the 
  terrace, 
  

   a 
  layer 
  of 
  unassorted 
  material 
  which 
  is 
  slightly 
  separated 
  from 
  the 
  

   rest; 
  also 
  at 
  the 
  south 
  end 
  of 
  the 
  terrace, 
  a 
  portion 
  of 
  thinly 
  and 
  

   obscurely 
  stratified 
  loamy 
  clay, 
  which 
  may 
  have 
  formed 
  a 
  portion 
  

   of 
  the 
  secondary 
  cone 
  of 
  this 
  delta. 
  At 
  Croton, 
  Haverstraw 
  and 
  

   Cornwall, 
  also 
  at 
  ISTew 
  Windsor, 
  the 
  clay 
  is 
  overlain 
  by 
  delta 
  ma- 
  

   terial, 
  and 
  where 
  this 
  occurs, 
  specially 
  at 
  Croton, 
  the 
  upper 
  limit 
  

   of 
  the 
  clay 
  is 
  comparatively 
  low, 
  it 
  having 
  probably 
  been 
  eroded 
  

   to 
  a 
  certain 
  extent 
  by 
  the 
  river 
  entering 
  the 
  estuary 
  at 
  that 
  point, 
  

   and 
  again 
  it 
  is 
  not 
  likely 
  that 
  very 
  much 
  clay 
  would 
  be 
  deposited 
  

   around 
  the 
  mouth 
  of 
  the 
  river 
  on 
  account 
  of 
  the 
  current. 
  This 
  

   may 
  have 
  been 
  the 
  case 
  below 
  Peekskill. 
  

  

  In 
  general 
  the 
  upper 
  limit 
  of 
  the 
  clay 
  increases 
  northward 
  as 
  

   does 
  the 
  terrace 
  level. 
  To 
  illustrate 
  this 
  point 
  we 
  have 
  the 
  follow- 
  

   ing 
  altitudes. 
  

  

  East 
  side 
  

  

  Croton 
  100 
  

  

  Peekskill 
  120 
  

  

  Fishkill 
  205 
  

  

  West 
  side 
  

  

  Haverstraw 
  100 
  

  

  Westpoint 
  185 
  

  

  Cornwall 
  200 
  

  

  Newburgh 
  205 
  

  

  Port 
  Ewen 
  . 
  .' 
  207 
  

  

  Schenectady 
  360 
  

  

  