﻿552 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  down 
  to 
  those 
  that 
  are 
  very 
  rich 
  in 
  dark 
  silicates. 
  No. 
  173 
  is 
  of 
  

   this 
  character, 
  the 
  dark 
  minerals 
  being 
  hypersthene, 
  green 
  

   augite, 
  and 
  brown 
  hornblende. 
  Plagioclase 
  is 
  also 
  present. 
  The 
  

   rocks 
  are 
  all 
  variations, 
  however 
  on 
  a 
  single 
  type 
  and 
  are 
  the 
  

   same 
  as 
  the 
  gneisses 
  described 
  from 
  Indian 
  Lake 
  and 
  Newconib. 
  

  

  The 
  strike 
  of 
  the 
  foliation 
  varies 
  a 
  good 
  deal. 
  The 
  commonest 
  

   seems 
  to 
  be 
  northeast, 
  but 
  northwest 
  strikes 
  have 
  been 
  recorded. 
  

  

  Series 
  2. 
  The 
  crystalline 
  limestones 
  have 
  only 
  been 
  found 
  

   where 
  the 
  Newcomb 
  road 
  crosses 
  the 
  town 
  line. 
  They 
  presented 
  

   no 
  unusual 
  features. 
  

  

  Series 
  3, 
  4 
  and 
  5 
  are 
  entirely 
  lacking. 
  

  

  Series 
  6. 
  The 
  glacial 
  drift 
  is 
  abundantly 
  developed 
  and 
  covers 
  

   much 
  of 
  the 
  town, 
  specially 
  near 
  the 
  shores 
  of 
  Long 
  lake 
  itself. 
  

   Boulders 
  enter 
  largely 
  into 
  it. 
  On 
  Cold 
  river, 
  considerable 
  an- 
  

   orthosite 
  occurs 
  in 
  the 
  drift, 
  and 
  rarely 
  a 
  Potsdam 
  pebble 
  may 
  be 
  

   seen. 
  In 
  the 
  angle 
  between 
  Long 
  lake 
  and 
  Cold 
  river 
  there 
  is 
  

   much 
  clay, 
  occurring 
  about 
  3 
  to 
  4 
  feet 
  above 
  the 
  water 
  level. 
  No 
  

   glacial 
  striae, 
  distinct 
  enough 
  to 
  measure, 
  were 
  observed. 
  

  

  Indian 
  Lake 
  

  

  Series 
  1. 
  The 
  portion 
  of 
  this 
  township 
  of 
  Hamilton 
  co. 
  lying 
  

   between 
  the 
  highway 
  from 
  North 
  River 
  to 
  Longlake 
  and 
  the 
  

   Essex 
  co. 
  line, 
  has 
  been 
  investigated 
  and 
  has 
  been 
  found 
  to 
  

   be 
  almost 
  entirely 
  gneise. 
  It 
  is 
  of 
  the 
  Whitehall 
  type, 
  and 
  

   contains 
  microperthitic 
  orthoelase, 
  some 
  plagioclase, 
  together 
  

   with 
  green 
  augite, 
  brown 
  hornblende 
  and 
  occasionally 
  hyper- 
  

   sthene. 
  Acidic 
  varieties 
  have 
  quartz, 
  and 
  very 
  basic 
  ones 
  are 
  

   rich 
  in 
  the 
  dark 
  silicates. 
  The 
  prevailing 
  strike 
  is 
  northwest 
  

   with 
  a 
  tendency 
  to 
  approach 
  an 
  east 
  and 
  west 
  direction. 
  

  

  Series 
  2. 
  The 
  crystalline 
  limestones 
  have 
  been 
  met 
  where 
  the 
  

   highway 
  crosses 
  the 
  line 
  with 
  Minerva, 
  but 
  they 
  have 
  not 
  been 
  

   elsewhere 
  discovered, 
  though 
  the 
  rather 
  open 
  and 
  level 
  char- 
  

   acter 
  of 
  the 
  country 
  would 
  lead 
  one 
  to 
  infer 
  their 
  more 
  extended 
  

   presence. 
  

  

  Series 
  3, 
  4 
  and 
  5 
  have 
  been 
  nowhere 
  observed 
  unless 
  the 
  

   gneiss 
  referred 
  to 
  above 
  belongs 
  with 
  Series 
  3. 
  

  

  