﻿CRYSTALLINE 
  ROCKS 
  OF 
  THE 
  WESTERN 
  ADIRONDACK 
  REGION 
  487 
  

  

  has 
  existed 
  between 
  the 
  writer's 
  work 
  on 
  the 
  west 
  and 
  that 
  of 
  

   Professors 
  Kemp 
  and 
  Cushing 
  on 
  the 
  east. 
  As 
  above 
  stated, 
  it 
  

   was 
  farther 
  desired 
  to 
  settle 
  if 
  possible 
  the 
  question 
  of 
  the 
  exist- 
  

   ence 
  of 
  a 
  great 
  core 
  of 
  gabbro, 
  which 
  has 
  been 
  assumed 
  to 
  make 
  

   up 
  the 
  central 
  part 
  of 
  the 
  region. 
  Hamilton 
  co. 
  being 
  practi- 
  

   cally 
  unknown 
  from 
  a 
  geological 
  point 
  of 
  view, 
  except 
  for 
  a 
  few 
  

   facts 
  published 
  by 
  Emmons 
  and 
  some 
  work 
  done 
  by 
  the 
  writer 
  

   several 
  years 
  since, 
  and 
  the 
  same 
  being 
  true 
  of 
  central 
  and 
  north- 
  

   ern 
  Herkimer 
  co. 
  it 
  was 
  decided 
  to 
  examine 
  the 
  region 
  contiguous 
  

   to 
  the 
  Fulton 
  chain 
  of 
  lakes 
  and 
  Raquette 
  lake 
  in 
  these 
  counties. 
  

  

  This 
  work 
  as 
  carried 
  out 
  gave 
  a 
  section 
  across 
  Herkimer 
  

   co. 
  and 
  well 
  into 
  Hamilton 
  co. 
  and 
  passed 
  through 
  the 
  hitherto 
  

   unexplored 
  area 
  lying 
  in 
  the 
  heart 
  of 
  the 
  Adirondack 
  region. 
  In 
  

   consequence, 
  while 
  the 
  work 
  was 
  in 
  the 
  nature 
  of 
  a 
  hasty 
  recon- 
  

   naissance 
  and 
  few 
  details 
  were 
  gathered, 
  the 
  broad 
  facts 
  estab- 
  

   lished 
  are 
  of 
  very 
  considerable 
  importance 
  in 
  their 
  bearing 
  on 
  

   the 
  geology 
  of 
  the 
  Adirondack 
  region 
  as 
  a 
  whole. 
  

  

  Approaching 
  this 
  area 
  along 
  the 
  line 
  of 
  the 
  Adirondack 
  and 
  St 
  

   Lawrence 
  railroad 
  the 
  first 
  outcrop 
  of 
  crystalline 
  rocks 
  is 
  seen 
  

   in 
  the 
  bed 
  of 
  Woodhull 
  creek 
  about 
  an 
  eighth 
  of 
  a 
  mile 
  north 
  of 
  

   the 
  Forestport 
  station. 
  The 
  rock 
  is 
  a 
  rather 
  massive, 
  coarse, 
  

   hornblende 
  gneiss 
  and 
  when 
  freshly 
  blasted 
  is 
  of 
  a 
  deep 
  gray 
  

   color 
  with 
  a 
  slight 
  greenish 
  tone. 
  The 
  grain 
  is 
  quite 
  variable, 
  

   and 
  coarse, 
  almost 
  pegmatitic 
  areas 
  are 
  seen 
  with 
  some 
  quartz 
  

   veins. 
  The 
  strike 
  is 
  northeast. 
  

  

  This 
  rock 
  continues 
  two 
  or 
  three 
  miles 
  north 
  and 
  then 
  a 
  pink 
  

   gneiss 
  mingled 
  with 
  gray 
  comes 
  in. 
  Two 
  and 
  one 
  half 
  miles 
  north 
  

   of 
  White 
  lake 
  a 
  quarry 
  has 
  been 
  opened 
  in 
  a 
  high, 
  steep 
  ridge, 
  

   round 
  the 
  northeast 
  end 
  of 
  which 
  the 
  railroad 
  runs. 
  The 
  rock 
  is 
  

   an 
  acid 
  gneiss 
  in 
  various 
  pale 
  tints 
  of 
  pink, 
  green 
  and 
  gray 
  and 
  

   often 
  contains 
  large 
  bunches 
  of 
  garnet 
  (pi. 
  7). 
  

  

  Most 
  of 
  the 
  outcrops 
  shown 
  along 
  the 
  railroad 
  as 
  far 
  as 
  Fulton 
  

   Chain 
  station 
  consist 
  of 
  either 
  pink 
  or 
  gray 
  massive 
  gneiss, 
  

   though 
  some 
  dark, 
  more 
  schistose 
  rocks 
  occur 
  in 
  small 
  patches. 
  

   Similar 
  rocks 
  are 
  crossed 
  in 
  driving 
  from 
  Fulton 
  Chain 
  to 
  Port 
  

   Leyden 
  in 
  the 
  Black 
  river 
  valley, 
  the 
  coarse 
  massive 
  gneisses 
  pre- 
  

  

  