﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  549 
  

  

  the 
  deposition 
  of 
  large 
  boulders 
  proceeds 
  are 
  evidently 
  not 
  favor- 
  

   able 
  to 
  a 
  benthonic 
  fauna, 
  the 
  scarcity 
  of 
  fossils 
  in 
  the 
  matrix 
  

   appears 
  natural; 
  and 
  the 
  view 
  of 
  the 
  continued 
  existence 
  of 
  the 
  

   fauna 
  of 
  the 
  pebbles, 
  in 
  some 
  adjacent 
  region, 
  and 
  its 
  occasional 
  

   incursion 
  into 
  the 
  graptolite 
  province 
  seems 
  to 
  be 
  the 
  better 
  sup- 
  

   ported. 
  This 
  would 
  mean 
  that 
  the 
  Normans 
  kill 
  graptolite 
  fauna 
  

   and 
  the 
  mollusk 
  and 
  trilobite 
  fauna 
  of 
  the 
  conglomerate 
  with 
  

   lower 
  Trenton 
  aspect 
  were 
  synchronous. 
  The 
  presence 
  of 
  Tren- 
  

   ton 
  fossils 
  in 
  so-called 
  Hudson 
  river 
  shales 
  has 
  been 
  proved 
  be- 
  

   fore 
  (see 
  p. 
  536). 
  So 
  has 
  the 
  resting 
  of 
  these 
  shales 
  immediately 
  

   on 
  lower 
  Trenton 
  limestone 
  beds 
  in 
  the 
  regions 
  to 
  the 
  east 
  (33) 
  

   and 
  to 
  the 
  south, 
  near 
  Poughkeepsie 
  (21). 
  

  

  Following 
  up 
  the 
  Moordener 
  kill 
  to 
  the 
  base 
  of 
  the 
  second 
  

   falls, 
  black 
  shales 
  with 
  intercalations 
  of 
  hard, 
  black 
  chert 
  beds 
  

   and 
  some 
  thinner 
  sandstone 
  and 
  limestone 
  bands 
  are 
  passed, 
  

   and 
  at 
  this 
  point 
  a 
  conglomerate 
  bed, 
  13 
  feet 
  thick 
  and 
  flanked 
  

   by 
  thinner 
  conglomerate 
  beds, 
  crosses 
  the 
  creek. 
  On 
  account 
  of 
  

   the 
  disturbed 
  character 
  of 
  the 
  region, 
  this 
  bed 
  may 
  be 
  identical 
  

   with 
  that 
  first 
  mentioned. 
  The 
  shales 
  continue 
  to 
  the 
  third 
  

   falls, 
  where 
  a 
  third 
  conglomerate 
  bed, 
  20 
  feet 
  thick, 
  is 
  met 
  with. 
  

   Then 
  follow 
  coarse 
  sandstones 
  in 
  layers 
  from 
  2 
  to 
  4 
  feet 
  thick, 
  

   and 
  sandy 
  shales, 
  and 
  above 
  them 
  black, 
  fissile, 
  argillaceous 
  

   shales 
  with 
  many 
  thin 
  intercalations 
  of 
  dark 
  limestone 
  and 
  sand- 
  

   stone. 
  After 
  a 
  break 
  of 
  some 
  300 
  feet, 
  dark 
  gray, 
  fissile 
  shales 
  

   again 
  appear, 
  and 
  these 
  continue 
  to 
  the 
  bridge 
  over 
  the 
  Moor- 
  

   dener 
  kill 
  on 
  the 
  road 
  between 
  Castleton 
  and 
  Schodack 
  depot 
  

   (Brookview). 
  Just 
  below 
  this 
  bridge, 
  in 
  steel 
  gray, 
  somewhat 
  

   sandy, 
  argillaceous 
  shales, 
  numerous 
  excellently 
  preserved 
  speci- 
  

   mens 
  of 
  Corynoides 
  calicularis 
  were 
  found. 
  This 
  

   occurrence 
  suggests 
  that 
  all 
  these 
  beds 
  may 
  belong 
  to 
  the 
  Dicello- 
  

   graptus 
  zone. 
  

  

  A 
  mile 
  and 
  a 
  half 
  farther 
  up, 
  the 
  creek 
  passes 
  again 
  over 
  

   glazed 
  gray 
  and 
  black 
  shales 
  and 
  bluish 
  quartzite 
  beds, 
  followed, 
  

   below 
  Dickerman's 
  mill, 
  2 
  miles 
  below 
  Schodack 
  Center, 
  by 
  the 
  

   green 
  and 
  purple 
  slates 
  and 
  grits 
  of 
  the 
  Cambric 
  formation. 
  

  

  