﻿CRYSTALLINE 
  ROCKS 
  OP 
  THE 
  WESTERN 
  ADIRONDACK 
  REGION 
  495 
  

  

  no 
  limestone 
  is 
  present, 
  there 
  can 
  scarcely 
  be 
  a 
  doubt 
  that 
  these 
  

   gneisses 
  belong 
  to 
  the 
  limestone 
  formation. 
  

  

  On 
  the 
  west 
  shore 
  of 
  Eighth 
  lake 
  and 
  on 
  the 
  island 
  are 
  good 
  

   exposures 
  of 
  a 
  typical 
  crystalline 
  limestone, 
  rich 
  in 
  mica, 
  pyrox- 
  

   ene 
  and 
  graphite. 
  The 
  usual 
  gray 
  and 
  rusty 
  gneisses 
  with 
  a 
  

   coarse 
  amphibolite 
  are 
  present 
  but 
  are 
  not 
  well 
  shown. 
  

  

  The 
  only 
  limestone 
  seen 
  on 
  Eaquette 
  lake 
  is 
  located 
  at 
  the 
  end 
  

   of 
  the 
  long 
  point 
  just 
  south 
  of 
  Marion 
  river. 
  The 
  limestone 
  itself 
  

   is 
  in 
  very 
  small 
  amount 
  and 
  quite 
  impure 
  but 
  the 
  rusty 
  gneiss 
  

   has 
  a 
  very 
  considerable 
  development. 
  

  

  As 
  already 
  stated 
  no 
  other 
  occurrences 
  (with 
  a 
  single 
  excep- 
  

   tion 
  to 
  be 
  mentioned 
  below) 
  of 
  actual 
  limestone 
  have 
  been 
  found, 
  

   but 
  the 
  formation 
  is 
  probably 
  represented 
  as 
  indicated 
  on 
  the 
  

   map 
  by 
  rusty 
  and 
  well 
  banded 
  gneisses 
  at 
  several 
  points. 
  

  

  From 
  the 
  foregoing 
  it 
  is 
  evident 
  that 
  the 
  limestone 
  formation 
  

   has 
  a 
  very 
  considerable 
  development 
  in 
  the 
  region 
  under 
  con- 
  

   sideration 
  and 
  that 
  it 
  corresponds 
  closely 
  in 
  character 
  with 
  the 
  

   limestone 
  formation 
  of 
  St 
  Lawrence 
  co., 
  though 
  so 
  far 
  as 
  seen 
  

   there 
  is 
  a 
  relatively 
  larger 
  amount 
  of 
  the 
  associated 
  gneisses 
  

   and 
  schists, 
  and 
  the 
  limestone 
  itself 
  is 
  decidedly 
  less 
  pure. 
  While 
  

   it 
  is 
  natural 
  and 
  for 
  working 
  purposes 
  convenient 
  to 
  assume 
  that 
  

   the 
  limestone 
  formations 
  of 
  the 
  two 
  areas 
  are 
  essentially 
  the 
  

   same, 
  the 
  fact 
  must 
  not 
  be 
  lost 
  sight 
  of 
  that 
  this 
  assumption 
  will 
  

   perhaps 
  never 
  be 
  proved 
  true. 
  And 
  even 
  with 
  this 
  condition 
  the 
  

   assumed 
  equivalency 
  must 
  not 
  be 
  considered 
  as 
  analogous 
  to 
  the 
  

   equivalency 
  of 
  different 
  areas 
  of 
  a 
  paleozoic 
  or 
  later 
  limestone, 
  

   but 
  rather 
  as 
  meaning 
  a 
  deposition 
  at 
  not 
  greatly 
  separated 
  in- 
  

   tervals 
  with 
  a 
  subsequent 
  history 
  essentially 
  identical. 
  

  

  From 
  the 
  data 
  presented 
  above 
  it 
  is 
  clear- 
  that 
  this 
  considerable 
  

   area 
  in 
  the 
  very 
  heart 
  of 
  the 
  Adirondack 
  region 
  is 
  made 
  up 
  essen- 
  

   tially 
  of 
  gneiss, 
  with 
  minor 
  quantities 
  of 
  crystalline 
  limestone 
  

   and 
  its 
  associated- 
  sedimentary 
  gneisses 
  and 
  schists. 
  

  

  While 
  local 
  variations 
  come 
  in, 
  all 
  of 
  these 
  rocks 
  show 
  a 
  pre- 
  

   vailing 
  northeast 
  strike 
  and 
  northerly 
  dip. 
  This 
  is 
  entirely 
  analo- 
  

   gous 
  to 
  what 
  is 
  shown 
  in 
  St 
  Lawrence, 
  Jefferson 
  and 
  northern 
  

  

  