﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  

  

  555 
  

  

  The 
  whole 
  system 
  of 
  shales 
  from 
  the 
  Lorraine 
  at 
  Waterford 
  

   through 
  the 
  Utica, 
  upper 
  (?) 
  and 
  middle 
  Trenton 
  shales 
  and 
  Dicel- 
  

   lograptus 
  shales 
  to 
  the 
  Cambric 
  slates 
  and 
  again 
  to 
  the 
  meta- 
  

   morphic 
  slates 
  east 
  of 
  the 
  Cambric 
  zone, 
  which 
  have 
  been 
  found 
  

   to 
  be 
  of 
  "Hudson 
  river 
  age", 
  proves 
  by 
  its 
  conformability 
  (its 
  

   uniform 
  eastern 
  dip) 
  that 
  it 
  was 
  one 
  in 
  system 
  of 
  dislocation 
  and 
  

   one 
  in 
  system 
  of 
  mountain-making. 
  Hence 
  the 
  writer 
  feels 
  safe 
  

   in 
  assuming 
  that 
  the 
  great 
  overthrust 
  fault 
  between 
  the 
  Dicello- 
  

   graptus 
  beds 
  and 
  Cambric 
  beds 
  is 
  a 
  fault 
  cutting 
  parallel 
  to 
  the 
  

   axial 
  plane 
  of 
  an 
  overfold, 
  the 
  western 
  underturned 
  wing 
  of 
  

   which 
  is 
  exposed 
  in 
  the 
  four 
  zones 
  described 
  in 
  this 
  paper. 
  

  

  The 
  orogenic 
  and 
  physiographic 
  stages 
  through 
  which 
  this 
  

   region 
  then 
  passed 
  would 
  have 
  been: 
  

  

  1 
  A 
  folding 
  of 
  Appalachian 
  type, 
  involving 
  all 
  terranes 
  inclu- 
  

   sive 
  of 
  the 
  Lorraine 
  beds 
  (fig. 
  2). 
  

  

  Fig. 
  2 
  Overfolding 
  of 
  Appalachian 
  type 
  (see 
  fig. 
  1) 
  in 
  Hudson 
  valley 
  of 
  Albany. 
  a=Cambrio 
  ; 
  

   b 
  = 
  Beekmantown 
  limestone 
  (Calciferous) 
  ; 
  c=lower 
  Trenton 
  limestone; 
  d 
  = 
  Normans 
  kill 
  shale; 
  

   e= 
  middle 
  and 
  upper 
  Trenton 
  shale; 
  f= 
  Utica 
  shale; 
  g= 
  Lorraine 
  beds. 
  

  

  2 
  The 
  formation 
  of 
  a 
  fault 
  in 
  the 
  underturned 
  wing 
  parallel 
  to 
  

   the 
  axial 
  plane 
  (fig. 
  3). 
  

  

  Fig. 
  3 
  Fault 
  in 
  underturned 
  wing 
  of 
  fold. 
  

  

  