﻿FIFTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I908 
  1 
  5 
  

  

  ones 
  during 
  the 
  later 
  period 
  of 
  mountain 
  making. 
  In 
  the 
  town 
  

   of 
  Fishkill, 
  lying 
  within 
  the 
  younger 
  rocks 
  and 
  extending 
  from 
  near 
  

   the 
  base 
  of 
  the 
  Bald 
  Hill 
  spur 
  northeastward 
  for 
  a 
  distance 
  of 
  5 
  

   miles 
  and 
  terminating 
  in 
  a 
  faulted 
  block 
  known 
  as 
  ".Fly 
  mountain/' 
  

   is 
  a 
  narrow 
  irilier 
  of 
  Precambric 
  rocks 
  which 
  will 
  be 
  shown 
  to 
  be 
  a 
  

   part 
  of 
  the 
  Highlands. 
  

  

  Reconnaissance 
  through 
  the 
  Highlands 
  indicates 
  the 
  essential 
  

   similarity 
  between 
  the 
  basal 
  gneisses 
  of 
  this 
  quadrangle 
  and 
  the 
  

   rest 
  of 
  the 
  northern 
  Highlands. 
  Within 
  the 
  quadrangle 
  there 
  is 
  

   no 
  evidence 
  of 
  more 
  than 
  one 
  sedimentary 
  series. 
  Considerable 
  

   shearing 
  has 
  occurred 
  and 
  is 
  considered 
  responsible 
  for 
  some 
  of 
  

   the 
  foliation. 
  Later 
  faulting 
  and 
  shearing 
  have 
  obscured 
  earlier 
  

   features. 
  There 
  is 
  given 
  as 
  a 
  result 
  of 
  pressure 
  always 
  applied 
  in 
  

   the 
  same 
  general 
  direction 
  and 
  from 
  the 
  factors 
  just 
  mentioned 
  an 
  

   isoclinal 
  character 
  to 
  these 
  rocks 
  that 
  simulates 
  an 
  immense 
  mono- 
  

   clinal 
  series 
  of 
  sediments. 
  Continuity 
  has 
  been 
  broken, 
  and 
  repe- 
  

   titions 
  by 
  earlier 
  folding 
  have 
  been 
  sheared 
  out, 
  by 
  faulting. 
  H' 
  

   the 
  identification 
  of 
  the 
  stratum 
  of 
  serpentinous 
  rock, 
  interbedded 
  

   with 
  the 
  gneiss, 
  as 
  an 
  altered 
  limestone 
  be 
  correct, 
  the 
  general 
  

   resemblance 
  which 
  these 
  gneisses 
  have 
  to 
  the 
  other 
  basal 
  gneisses 
  

   of 
  the 
  Highlands 
  has 
  confirmation 
  in 
  that 
  fact. 
  Recent 
  work 
  by 
  

   Berkey^ 
  in 
  IManhattan 
  shows 
  limestones 
  interbedded 
  with 
  the 
  Ford- 
  

   ham 
  gneiss, 
  which 
  strengthen 
  the 
  correlation 
  previously 
  made 
  by 
  

   him 
  of 
  the 
  Fordham 
  gneiss 
  with 
  the 
  gneisses 
  of 
  the 
  Highlands. 
  

  

  Poughquag 
  quartzite. 
  This 
  formation 
  which 
  intermittently 
  

   appears, 
  overlying 
  the 
  gneisses 
  along 
  their 
  northern 
  border, 
  from 
  

   the 
  type 
  locality 
  at 
  Poughquag, 
  Dutchess 
  co., 
  to 
  the 
  Hudson 
  river 
  

   is 
  undoubtedly 
  of 
  Lower 
  Cambric 
  age. 
  Fossils 
  have 
  not 
  been 
  

   found 
  in 
  this 
  formation, 
  but 
  the 
  blue 
  limestone 
  immediately 
  over- 
  

   lying 
  it, 
  into 
  which 
  it 
  grades, 
  has 
  yielded 
  the 
  opercula 
  of 
  

   Hyolithellus 
  micans. 
  The 
  relationship 
  of 
  the 
  quartzite 
  to 
  

   the 
  gneiss 
  and 
  of 
  the 
  quartzite 
  to 
  the 
  overlying 
  limestones 
  and 
  

   calcareous 
  shales 
  as 
  seen 
  south 
  of 
  Johnsville, 
  in 
  the 
  East 
  Hook, 
  

   are 
  very 
  similar 
  to 
  those 
  near 
  Stissing 
  mountain, 
  at 
  Stissing 
  Junc- 
  

   tion 
  and 
  Attlebury, 
  farther 
  north 
  in 
  Dutchess 
  county, 
  which 
  have 
  

   been 
  proved 
  to 
  be 
  Lower 
  Cambric 
  by 
  the 
  discovery 
  of 
  Olenellus 
  in 
  

   the 
  quartzite 
  and 
  of 
  opercula 
  ofH. 
  micans 
  in 
  the 
  overlying 
  

   limestone. 
  The 
  rusty 
  friable 
  Olenellus 
  quartzite 
  described 
  by 
  Wal- 
  

   cott 
  and 
  Dwight 
  and 
  found 
  by 
  the 
  wTiter 
  west^of 
  Stissing 
  Junction 
  

   could 
  not 
  be 
  located 
  in 
  the 
  Fishkill 
  mountains. 
  

  

  ^ 
  Science 
  N. 
  S. 
  v. 
  28, 
  no. 
  730, 
  p. 
  936. 
  

  

  