﻿490 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  of 
  Essex 
  co. 
  The 
  western 
  magnetites 
  are 
  so 
  far 
  as 
  seen 
  

   either 
  portions 
  of 
  the 
  country 
  gneiss 
  abnormally 
  rich 
  in 
  mag- 
  

   netite 
  and 
  shading 
  off 
  on 
  all 
  sides 
  into 
  the 
  ordinary 
  rock, 
  show- 
  

   ing 
  no 
  well 
  denned 
  ore 
  body 
  and 
  with 
  no 
  associated 
  intrusive 
  

   masses, 
  or 
  they 
  are 
  simple 
  segregations 
  of 
  magnetite 
  in 
  an 
  

   igneous 
  rock, 
  such 
  as 
  those 
  in 
  the 
  syenite 
  of 
  Diana 
  and 
  Pitcairn 
  

   above 
  described. 
  The 
  latter 
  are 
  of 
  course 
  analogous 
  to 
  the 
  titan- 
  

   iferous 
  magnetites 
  of 
  the 
  gabbro 
  areas 
  in 
  Essex 
  co. 
  though 
  on 
  a 
  

   much 
  smaller 
  scale. 
  

  

  From 
  Fulton 
  Chain 
  station 
  a 
  reconnaissance 
  was 
  made 
  to 
  the 
  

   southeast, 
  east 
  and 
  northeast, 
  embracing 
  the 
  region 
  about 
  Little 
  

   Moose 
  lake, 
  Lime 
  Kiln 
  creek, 
  and 
  Lime 
  Kiln, 
  Fulton 
  Chain, 
  North 
  

   Branch, 
  Big 
  Moose, 
  Raquette 
  and 
  Forked 
  lakes. 
  This 
  examina- 
  

   tion 
  gives 
  in 
  addition 
  to 
  previous 
  work 
  a 
  section 
  of 
  considerable 
  

   width, 
  extending 
  from 
  the 
  Black 
  river 
  in 
  Lewis 
  co. 
  across 
  Herki- 
  

   mer 
  co. 
  and 
  half 
  way 
  across 
  Hamilton 
  co. 
  Throughout 
  this 
  lake 
  

   region 
  there 
  is, 
  excepting 
  a 
  few 
  localities 
  to 
  be 
  referred 
  to 
  later, 
  a 
  

   great 
  uniformity 
  in 
  the 
  geology 
  and 
  the 
  area 
  may 
  be 
  briefly 
  de- 
  

   scribed 
  as 
  a 
  whole. 
  

  

  The 
  prevailing 
  rock 
  is 
  a 
  medium 
  grained 
  hornblende 
  gneiss, 
  

   closely 
  resembling 
  that 
  described 
  as 
  occurring 
  at 
  Forestport. 
  In 
  

   ordinary 
  weathered 
  exposures 
  the 
  rock 
  is 
  light 
  brown, 
  but 
  when 
  

   fresh 
  is 
  a 
  deep 
  gray, 
  sometimes 
  with 
  a 
  greenish 
  tinge, 
  or 
  a 
  pale 
  

   red, 
  the 
  passage 
  from 
  one 
  color 
  to 
  the 
  other 
  being 
  quite 
  gradual. 
  

   While 
  foliation 
  is 
  usually 
  shown, 
  it 
  is 
  seldom 
  very 
  perfect 
  and 
  

   massive 
  phases 
  are 
  common. 
  Banding 
  though 
  occasionally 
  

   present 
  is 
  a 
  decidedly 
  exceptional 
  feature. 
  The 
  foliation 
  strike 
  

   is 
  prevailingly 
  northeast 
  though 
  exceptions 
  are 
  not 
  rare, 
  and 
  the 
  

   dip 
  when 
  shown 
  is 
  usually 
  to 
  the 
  north. 
  

  

  The 
  most 
  pfonounced 
  feature 
  of 
  this 
  rock 
  is 
  its 
  uniformity 
  

   over 
  wide 
  areas, 
  the 
  utmost 
  sameness 
  being 
  presented 
  in 
  a 
  very 
  

   large 
  percentage 
  of 
  the 
  outcrops 
  seen 
  throughout 
  this 
  region. 
  It 
  

   is 
  well 
  shown 
  at 
  many 
  points 
  along 
  the 
  shores 
  of 
  the 
  lakes 
  and 
  

   on 
  the 
  neighboring 
  mountains. 
  

  

  The 
  same 
  unformity 
  marks 
  the 
  rock 
  as 
  seen 
  in 
  thin 
  section. 
  

   It 
  is 
  an 
  aggregate 
  of 
  microperthitic 
  feldspar, 
  quartz 
  and 
  deep 
  

  

  