﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  531 
  

  

  Besides 
  this 
  occur: 
  

  

  Diplograptus 
  quadriniucronatus, 
  Hall 
  

  

  Diplograptus 
  cf. 
  foliaceus, 
  Murchison, 
  fragments 
  

  

  Corynoides 
  curtus, 
  Lapicorth 
  

  

  Leptobolus 
  insignis, 
  Hall 
  

  

  Station 
  19. 
  Ravine 
  by 
  Normans 
  kill 
  

   About 
  half 
  a 
  mile 
  farther 
  up 
  the 
  river 
  in 
  a 
  ravine 
  in 
  the 
  south 
  

   bank 
  a 
  gray, 
  arenaceous 
  and 
  micaceous, 
  thin 
  bedded 
  shale 
  was 
  

   found 
  which 
  yielded 
  quite 
  a 
  number 
  of 
  specimens 
  of 
  Diplo- 
  

   graptus 
  putillus, 
  Hall 
  (station 
  19). 
  The 
  beds 
  of 
  this, 
  as 
  

   those 
  of 
  all 
  preceding 
  stations, 
  dip 
  steeply 
  to 
  the 
  east 
  and 
  have 
  

   been 
  involved 
  in 
  the 
  tilting 
  of 
  the 
  Hudson 
  river 
  beds. 
  

  

  Station 
  20. 
  Black 
  creek, 
  Voorheesville 
  

  

  Following 
  the 
  Normans 
  kill 
  no 
  outcrops 
  are 
  found 
  in 
  its 
  widen- 
  

   ing 
  valley 
  or 
  along 
  any 
  of 
  the 
  tributaries 
  till 
  reaching 
  Black 
  

   creek, 
  a 
  small 
  southerly 
  affluent, 
  4 
  miles 
  farther 
  up 
  (station 
  20). 
  

   The 
  banks 
  and 
  the 
  bed 
  of 
  this 
  creek 
  are 
  formed 
  of 
  dark, 
  often 
  

   black, 
  soft, 
  non-metamorphic, 
  mostly 
  argillaceous 
  shales, 
  from 
  

   which 
  the 
  creek 
  derives 
  its 
  name. 
  While 
  near 
  its 
  mouth 
  the 
  

   shale 
  is 
  slightly 
  disturbed 
  by 
  a 
  fault 
  which, 
  according 
  to 
  its 
  south- 
  

   west 
  strike, 
  still 
  belongs, 
  as 
  an 
  accessory 
  fault, 
  to 
  the 
  Hudson 
  

   river 
  system 
  of 
  faults, 
  -the 
  shales 
  farther 
  up 
  the 
  creek 
  show 
  a 
  

   regular 
  n 
  70° 
  w 
  dip 
  and 
  n 
  160° 
  w 
  strike, 
  and 
  lie 
  hence 
  outside 
  

   the 
  easterly 
  tilted 
  block 
  of 
  the 
  Hudson 
  river 
  region. 
  The 
  large 
  

   fault 
  reported 
  by 
  Emmons 
  and 
  Ford 
  as 
  extending 
  from 
  Saratoga 
  

   Springs 
  across 
  the 
  Mohawk 
  river 
  and 
  separating 
  the 
  tilted 
  and 
  

   folded 
  Hudson 
  river 
  region 
  from 
  the 
  undisturbed 
  region 
  to 
  the 
  

   west, 
  probably 
  passes 
  the 
  Normans 
  kill 
  between 
  the 
  last 
  two 
  sta- 
  

   tions 
  and 
  may 
  also 
  account 
  for 
  the 
  lack 
  of 
  outcrops 
  and 
  the 
  

   broadening 
  of 
  the 
  valley 
  between 
  them. 
  These 
  black 
  shales 
  con- 
  

   tain: 
  

  

  Orthograptus 
  quad.rimucronatus, 
  Hall 
  sp. 
  

  

  Diplograptus 
  putillus, 
  Hall 
  

  

  Climacograptus 
  typicalis, 
  Hall 
  

  

  