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  68 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  As 
  the 
  numerous 
  inliers 
  on 
  the 
  northwest 
  side 
  of 
  the 
  Adirondacks 
  

   and 
  those 
  of 
  Middleville 
  and 
  Little 
  Falls 
  are 
  only 
  outlying 
  portions 
  

  

  «ENRY 
  

  

  Fig. 
  s 
  Inliers 
  of 
  Precambiric 
  

  

  Potsdam 
  sandstone 
  

   N.iY. 
  Seals 
  I 
  m. 
  = 
  

  

  at 
  Port 
  Henry, 
  

  

  of 
  the 
  Adirondack 
  massive, 
  which 
  have 
  become 
  inliers 
  by 
  burial 
  

   under 
  Paleozoic 
  rocks 
  and 
  subsequent 
  partial 
  exposure 
  by 
  erosion, 
  

   so 
  the 
  whole 
  Adirondack 
  massive 
  is 
  but 
  an 
  outlying 
  portion 
  of 
  the 
  

   Canadian 
  shield 
  or 
  protaxis, 
  that 
  once 
  was 
  more 
  or 
  less 
  buried 
  

   under 
  lower 
  Paleozoic 
  rocks 
  and 
  is 
  now 
  an 
  immense 
  inli^r 
  in 
  them. 
  

   It 
  might 
  be 
  well 
  to 
  distinguish 
  inliers 
  of 
  this 
  magnitude 
  from 
  the 
  

   smaller 
  ones 
  as 
  of 
  the 
  first 
  order. 
  We 
  shall 
  see 
  that 
  the 
  same 
  

   distinction 
  can 
  be 
  made 
  in 
  regard 
  to 
  the 
  other 
  groups 
  of 
  inliers, 
  

   and 
  indeed 
  has 
  been 
  made 
  before 
  by 
  Suess 
  in 
  regard 
  to 
  the 
  

   " 
  horsts." 
  

  

  This 
  Adirondack 
  inlier 
  of 
  the 
  first 
  order 
  which 
  lies 
  at 
  the 
  south- 
  

   east 
  side 
  of 
  the 
  Canadian 
  shield, 
  has 
  a 
  complete 
  counterpart 
  in 
  

   another 
  inlier 
  of 
  similar 
  size 
  and 
  corresponding 
  position 
  on 
  

   the 
  southwest 
  side 
  of 
  the 
  shield 
  in 
  the 
  Wisconsin 
  Precambric 
  

   area 
  •(''Isle 
  Wisconsin"). 
  We 
  consider 
  that 
  the 
  position 
  of 
  

   these 
  two 
  inliers 
  in 
  regard 
  to 
  the 
  Canadian 
  shield 
  and 
  the 
  

   Great 
  Lakes 
  indicates 
  a 
  symmetry 
  of 
  structure 
  that 
  is 
  of 
  some 
  im- 
  

  

  