﻿488 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  vailing, 
  but 
  the 
  finer 
  gneisses 
  coming 
  in 
  occasionally. 
  At 
  and 
  

   near 
  Moose 
  river 
  well 
  banded 
  fine 
  gneisses 
  and 
  rusty 
  gneisses 
  

   strongly 
  suggest 
  the 
  limestone 
  series, 
  though 
  in 
  the 
  hasty 
  exam- 
  

   ination 
  made 
  no 
  limestone 
  was 
  seen.o- 
  

  

  At 
  Fulton 
  Chain 
  station 
  a 
  ridge 
  of 
  reddish 
  gneiss 
  is 
  shown 
  

   west 
  of 
  the 
  track. 
  The 
  rock 
  is 
  sometimes 
  quite 
  massive 
  and 
  

   again 
  well 
  -foliated 
  with 
  strike 
  n40°e 
  and 
  dip 
  25°n. 
  A 
  few 
  

   rods 
  north 
  of 
  the 
  station 
  in 
  this 
  ridge 
  is 
  the 
  mine 
  which 
  

   furnished 
  the 
  ore 
  for 
  the 
  forge 
  which 
  has 
  given 
  the 
  name 
  to 
  the 
  

   neighboring 
  hamlet 
  of 
  Old 
  Forge. 
  Though 
  the 
  ore 
  deposit 
  is 
  of 
  

   surprisingly 
  meager 
  dimensions 
  to 
  have 
  led 
  to 
  the 
  investment 
  of 
  

   considerable 
  money, 
  even 
  under 
  the 
  conditions 
  existing 
  nearly 
  a 
  

   century 
  ago, 
  it 
  is 
  not 
  without 
  interest. 
  

  

  The 
  opening 
  is 
  broad 
  and 
  low, 
  of 
  slight 
  depth 
  but 
  sufficient 
  to 
  

   expose 
  the 
  ore 
  well. 
  At 
  this 
  point 
  the 
  rock 
  of 
  the 
  ridge 
  is 
  very 
  

   massive, 
  having 
  all 
  the 
  appearance 
  of 
  a 
  medium 
  grained, 
  red 
  

   hornblende 
  granite. 
  Irregularly 
  scattered 
  through 
  this 
  rock 
  and 
  

   shading 
  into 
  it 
  by 
  imperceptible 
  degrees 
  are 
  areas 
  of 
  fairly 
  coarse 
  

   pegmatite. 
  These 
  areas 
  are 
  sometimes 
  vein-like 
  in 
  form 
  but 
  quite 
  

   as 
  often 
  entirely 
  irregular, 
  and 
  their 
  gradual 
  blending 
  with 
  the 
  

   country 
  rock 
  is 
  so 
  marked 
  that 
  it 
  seems 
  hardly 
  possible 
  to 
  regard 
  

   them 
  as 
  intrusions. 
  While 
  sometimes 
  highly 
  quartzose, 
  the 
  peg- 
  

   matite 
  is 
  more 
  generally 
  marked 
  by 
  a 
  great 
  predominance 
  of 
  feld- 
  

   spar 
  in 
  roughly 
  bounded 
  crystals. 
  Under 
  the 
  microscope 
  this 
  

   feldspar 
  is 
  shown 
  to 
  be 
  an 
  acid 
  plagioclase. 
  

  

  Filling 
  the 
  interspaces 
  between 
  the 
  feldspars 
  or 
  the 
  feldspar 
  

   and 
  quartz 
  is 
  magnetite, 
  which 
  serves 
  as 
  a 
  sort 
  of 
  binding 
  ma- 
  

   terial 
  to 
  hold 
  together 
  the 
  other 
  minerals; 
  and 
  it 
  is 
  this 
  rock 
  that 
  

   constitutes 
  the 
  ore. 
  In 
  the 
  dump 
  specimens 
  as 
  well 
  as 
  in 
  the 
  

   walls 
  of 
  the 
  mine 
  the 
  magnetite 
  is 
  a 
  decidedly 
  minor 
  constituent 
  

   of 
  the 
  pegmatite, 
  which 
  is 
  itself 
  in 
  limited 
  amount. 
  So 
  the 
  ore 
  is 
  

   very 
  lean 
  and 
  forms 
  a 
  limited 
  and 
  irregular 
  body 
  in 
  a 
  hard 
  wall 
  

   rock. 
  But 
  as 
  the 
  proportion 
  of 
  magnetite 
  varies 
  widely 
  and 
  

   occasional 
  lumps 
  are 
  comparatively 
  rich, 
  it 
  is 
  probable 
  that 
  a 
  

   little 
  fairly 
  good 
  ore 
  may 
  have 
  been 
  taken 
  out. 
  

  

  a 
  Since 
  the 
  above 
  was 
  written 
  Mr 
  D. 
  H. 
  Newland 
  has 
  found 
  a 
  little 
  impure 
  lime- 
  

   stone 
  at 
  this 
  point. 
  

  

  