﻿i8o 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  latter 
  protruding 
  from 
  still 
  younger 
  rocks. 
  But 
  it 
  is 
  certain 
  that 
  

   not 
  only 
  the 
  Cambric 
  belts 
  in 
  eastern 
  New 
  York 
  but 
  also 
  

   some 
  of 
  the 
  large 
  inliers 
  of 
  basal 
  gneisses 
  along 
  tlie 
  eastern 
  

   boundary 
  partake 
  of 
  the 
  nature 
  of 
  folded 
  or 
  anticline 
  inliers 
  ; 
  this 
  

   would 
  seem 
  to 
  be 
  especially 
  clear 
  in 
  the 
  case 
  of 
  the 
  large 
  inlier, 
  

   beginning 
  near 
  Dover 
  Plains 
  (east 
  of 
  Poughkeepsie) 
  and 
  extend- 
  

   ing 
  northeast 
  along 
  the 
  Ilousatonic 
  river. 
  This 
  is 
  surrounded 
  on 
  

   the 
  west 
  and 
  south 
  sides 
  by 
  a 
  belt 
  of 
  crystalline 
  limestone. 
  The 
  

   Highlands 
  themselves 
  are 
  a 
  " 
  horst 
  " 
  [see 
  p. 
  i86] 
  as 
  we 
  shall 
  see 
  

   later. 
  . 
  " 
  

  

  /\ 
  y\ 
  y\ 
  

  

  Fig. 
  20 
  Inlier 
  of 
  Precambric 
  rocks 
  \ 
  /\ 
  /\ 
  /] 
  

  

  in 
  Georg- 
  

  

  ian 
  

  

  md 
  Lower 
  Siluric 
  limestone 
  

  

  

  and 
  shale 
  ^ 
  

   IS 
  m. 
  ^ 
  I 
  ir 
  

  

  at 
  Stissing 
  mountain, 
  N. 
  Y. 
  Scile 
  

  

  Numerous 
  short, 
  pitching 
  or 
  brachyanticlines 
  that 
  form 
  inliers, 
  

   project 
  from 
  the 
  Hudson 
  River 
  shale 
  belt. 
  One 
  of 
  the 
  best 
  ex- 
  

   amples 
  of 
  this 
  group 
  is 
  Stissing 
  mountain, 
  northeast 
  of 
  Poughkeep- 
  

   sie 
  [see 
  text 
  fig. 
  20]. 
  It 
  consists 
  of 
  an 
  elliptic 
  outcrop 
  of 
  gneiss, 
  

   surrounded 
  by 
  a 
  belt 
  of 
  Cambric 
  rocks 
  on 
  all 
  sides 
  except 
  the 
  north, 
  

   the 
  whole 
  projecting 
  from 
  the 
  plateau 
  of 
  metamorphic 
  Lower 
  

   Siluric 
  shales. 
  This 
  outcrop 
  of 
  gneiss 
  is 
  20 
  miles 
  away 
  from 
  the 
  

   larger 
  Housatonic 
  inlier. 
  It 
  also 
  distinguishes 
  itself 
  from 
  the 
  many 
  

   smaller 
  inliers 
  of 
  Cambric 
  rocks 
  in 
  the 
  neighborhood 
  by 
  the 
  fact 
  

   that 
  it 
  does 
  not 
  follow 
  the 
  northeast 
  direction 
  of 
  the 
  latter, 
  but 
  

   strikes 
  due 
  north. 
  This 
  indicates 
  that 
  this 
  remarkable 
  protrusion 
  

   of 
  gneiss 
  through 
  the 
  thick 
  belt 
  of 
  Cambric 
  and 
  Lower 
  Siluric 
  

  

  