﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  537 
  

  

  The 
  occurrence 
  of 
  Pachydictya 
  acuta, 
  R 
  h 
  y 
  n 
  c 
  h 
  o 
  - 
  

   trema 
  increbeseens 
  and 
  Proetus 
  parviusculus 
  

   would, 
  hence, 
  indicate 
  a 
  lower 
  or 
  middle 
  Trenton 
  age 
  for 
  these 
  

   beds, 
  which 
  correlation 
  can, 
  on 
  account: 
  of 
  the 
  abundance 
  and 
  

   association 
  of 
  Diplograptus 
  amplexicaulis, 
  with 
  

   these 
  fossils, 
  be 
  limited 
  with 
  a 
  fair 
  degree 
  of 
  exactness 
  to 
  the 
  

   middle 
  Trenton 
  age. 
  

  

  A 
  remarkable 
  and 
  easily 
  misleading 
  feature 
  of 
  some 
  beds 
  in 
  

   this 
  as 
  well 
  as 
  in 
  the 
  Fitzgerald 
  quarry 
  is 
  their 
  great 
  similarity 
  

   to 
  some 
  Lorraine 
  beds 
  at 
  Waterford; 
  for 
  in 
  all 
  three 
  localities 
  

   there 
  occur 
  gray, 
  sandy 
  argillaceous 
  rocks 
  with 
  iron-stained 
  fos- 
  

   sils, 
  which 
  it 
  would 
  be 
  difficult 
  to 
  separate 
  by 
  their 
  lithologic 
  

   aspect, 
  but 
  the 
  fossil 
  contents 
  and 
  a 
  strong 
  admixture 
  of 
  calcare- 
  

   ous 
  matter 
  in 
  the 
  rocks 
  of 
  the 
  Brothers's 
  quarry 
  show 
  that 
  this 
  

   similarity 
  is 
  only 
  accidental. 
  

  

  Station 
  25. 
  Ruscher's 
  quarry, 
  south 
  Troy 
  

  

  Directly 
  south 
  of 
  the 
  Brothers's 
  quarry 
  and 
  in 
  the 
  strike 
  of 
  its 
  

   rocks 
  lies 
  another 
  large 
  quarry, 
  Ruscher's 
  (station 
  25). 
  The 
  same 
  

   black 
  shales, 
  heavy 
  sandstone 
  banks 
  and 
  arenaceous 
  limestone 
  

   beds, 
  as 
  well 
  as 
  greenish 
  shales 
  toward 
  the 
  eastern 
  part, 
  are 
  here 
  

   exposed. 
  Diplograptus 
  amplexicaulis 
  is 
  also 
  quite 
  

   common. 
  

  

  Station 
  26. 
  Corner 
  of 
  Adams 
  and 
  10th 
  streets, 
  Troy 
  

  

  In 
  the 
  railroad 
  cut 
  at 
  the 
  corner 
  of 
  Adams 
  and 
  10th 
  streets 
  in 
  

   North 
  Troy, 
  (station 
  26) 
  in 
  a 
  compact, 
  black 
  argillaceous 
  shale 
  

   Diplograptus 
  amplexicaulis, 
  Hall, 
  and 
  Cory- 
  

   noides 
  curtus, 
  Nicholson, 
  were 
  found. 
  These 
  fossils 
  and 
  

   the 
  appearance 
  of 
  the 
  rock 
  leave 
  no 
  doubt 
  of 
  the 
  identity 
  of 
  these 
  

   beds 
  with 
  those 
  exposed 
  in 
  their 
  direct 
  strike 
  in 
  the 
  Brothers's 
  

   and 
  Ruscher's 
  quarries 
  in 
  south 
  Troy. 
  No 
  other 
  exposures 
  of 
  

   these 
  beds 
  have 
  been 
  met 
  with 
  farther 
  north, 
  in 
  the 
  investigated 
  

   area, 
  though 
  they 
  undoubtedly 
  continue 
  in 
  the 
  direction 
  indicated 
  

   by 
  the 
  outcrops 
  in 
  Troy. 
  

  

  