﻿THE 
  GEOLOGICAL 
  HISTORY 
  OF 
  NEW 
  YORK 
  STATE 
  

  

  85 
  

  

  that 
  this 
  late 
  Tertiary 
  reelevation 
  notably 
  affected 
  the 
  rest 
  of 
  the 
  

   State. 
  

  

  This 
  inner 
  gorge 
  of 
  the 
  Hudson 
  valley 
  has 
  been 
  traced 
  for 
  fully 
  

   100 
  miles 
  eastward 
  beyond 
  the 
  mouth 
  of 
  the 
  present 
  river. 
  The 
  

   Coast 
  and 
  Geodetic 
  Survey 
  has 
  made 
  a 
  detailed 
  map 
  (see 
  figure 
  28) 
  

   of 
  the 
  ocean 
  bottom 
  near 
  New 
  York 
  City, 
  and 
  the 
  submerged 
  chan- 
  

   nel 
  of 
  the 
  Hudson 
  river 
  is 
  clearly 
  shown 
  as 
  a 
  distinct 
  trench 
  cut 
  

  

  Fig. 
  28 
  The 
  submerged 
  Hudson 
  River 
  channel, 
  whose 
  position 
  is 
  clearly 
  

   shown 
  by 
  the 
  contour 
  lines. 
  Figures 
  indicate 
  depth 
  of 
  water 
  in 
  fathoms. 
  

   Data 
  from 
  Coast 
  and 
  Geodetic 
  Survey. 
  

  

  into 
  the 
  continental 
  sheif. 
  Even 
  in 
  the 
  Hudson 
  valley 
  above 
  New 
  

   York 
  City, 
  the 
  narrow 
  inner 
  rock 
  channel 
  has 
  a 
  depth 
  of 
  hundreds 
  

   of 
  feet 
  (see 
  plate 
  38) 
  and 
  is 
  mostly 
  submerged 
  below 
  tide 
  water. 
  

   Without 
  any 
  question 
  this 
  submerged 
  Hudson 
  channel 
  was 
  cut 
  

   when 
  the 
  region 
  was 
  dry 
  land, 
  and 
  thus 
  we 
  have 
  positive 
  proof 
  

   that 
  late 
  in 
  the 
  Tertiary, 
  and 
  possibly 
  extending 
  into 
  the 
  early 
  

   Quaternary, 
  the 
  region 
  of 
  southeastern 
  New 
  York 
  was 
  notabl) 
  

   higher 
  than 
  it 
  is 
  today. 
  Conservative 
  estimates 
  place 
  the 
  amount 
  

  

  