﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  533 
  

  

  are 
  overlain 
  by 
  the 
  Upper 
  Siluric 
  and 
  Devonic 
  strata 
  of 
  these 
  

   mountains. 
  

  

  Extension 
  of 
  zone 
  of 
  Utica 
  shale 
  

  

  The 
  stations 
  5 
  to 
  21 
  comprise 
  all 
  the 
  localities 
  with 
  Utica 
  fos- 
  

   sils 
  known 
  to 
  the 
  writer 
  in 
  this 
  region. 
  They 
  are 
  arranged, 
  as 
  a 
  

   glance 
  at 
  the 
  map 
  will 
  show 
  T 
  , 
  in 
  a 
  zone 
  which, 
  beginning 
  at 
  the 
  

   banks 
  of 
  the 
  Hudson 
  river 
  at 
  Laveny's 
  point, 
  passing 
  over 
  the 
  

   islands 
  at 
  the 
  mouth 
  of 
  the 
  Mohawk 
  and 
  following 
  thence 
  the 
  

   edge 
  of 
  the 
  plateau 
  to 
  the 
  west 
  of 
  the 
  Hudson 
  valley, 
  crosses 
  the 
  

   upper 
  part 
  of 
  the 
  city 
  of 
  Albany 
  and 
  extends 
  to 
  the 
  Normans 
  kill, 
  

   where 
  it 
  passes 
  under 
  the 
  drift. 
  As 
  this 
  series 
  of 
  outcrops 
  lies 
  in 
  

   the 
  general 
  direction 
  of 
  the 
  strike 
  of 
  the 
  rocks, 
  and 
  the 
  latter 
  

   form 
  a 
  mass 
  with 
  uniform 
  easterly 
  dip, 
  it 
  may 
  be 
  safely 
  concluded 
  

   that 
  this 
  zone 
  represents 
  a 
  continuous 
  terrane 
  of 
  Utica 
  beds 
  over- 
  

   lying 
  the 
  Lorraine 
  (beds 
  of 
  equal 
  dip 
  in 
  the 
  tilted 
  region, 
  and 
  un- 
  

   derlying 
  the 
  latter 
  in 
  the 
  undisturbed 
  region 
  to 
  the 
  west 
  of 
  the 
  

   separating 
  fault. 
  Toward 
  the 
  north 
  the 
  zone 
  probably 
  connects 
  

   with 
  the 
  Utica 
  shale 
  known 
  from 
  the 
  neighborhood 
  of 
  Mechancis- 
  

   ville, 
  Saratoga 
  Springs, 
  Sandyhill, 
  etc. 
  

  

  C 
  MIDDLE 
  TRENTON 
  BEDS 
  

  

  Station 
  22. 
  Watervliet 
  arsenal 
  

  

  The 
  next 
  group 
  of 
  stations 
  (stations 
  22-26) 
  comprises 
  five 
  locali- 
  

   ties 
  which 
  may 
  be 
  arranged 
  in' 
  two 
  rows 
  extending 
  from 
  n 
  ne 
  to 
  

   s 
  sw 
  on 
  both 
  sides 
  of 
  the 
  Hudson 
  river 
  south 
  of 
  Watervliet 
  and 
  

   Troy. 
  These 
  localities 
  furnish 
  Trenton 
  fossils. 
  The 
  occurrence 
  

   of 
  the 
  latter 
  was 
  first 
  made 
  known 
  by 
  Whitfield 
  (see 
  p. 
  496), 
  who 
  

   reported 
  the 
  finding 
  of 
  Diplograptus 
  amplexicaulis 
  

   at 
  the 
  Watervliet 
  arsenal 
  (station 
  22), 
  and 
  south 
  of 
  Troy 
  in 
  shaly 
  

   partings 
  between 
  layers 
  of 
  metamorphic 
  limestone. 
  The 
  locality 
  

   at 
  the 
  arsenal 
  is 
  no 
  more 
  accessible, 
  but 
  part 
  of 
  the 
  material 
  

   collected 
  at 
  that 
  time 
  is 
  preserved 
  in 
  the 
  state 
  museum. 
  It 
  con- 
  

   sists 
  of 
  very 
  soft 
  bluish 
  black, 
  argillaceous 
  shale, 
  which 
  does 
  not 
  

   effervesce 
  with 
  HC1 
  and 
  is 
  thickly 
  packed 
  with 
  a 
  long, 
  narrow 
  

   graptolite 
  which 
  in 
  dimensions, 
  arrangement 
  and 
  form 
  of 
  thecae 
  

  

  