﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  453 
  

  

  Co. 
  but 
  owing 
  to 
  its 
  siliceous 
  nature 
  it 
  has 
  been 
  used 
  only 
  for 
  

   structural 
  purposes. 
  The 
  following 
  analysis 
  illustrates 
  the 
  char- 
  

   acter 
  of 
  the 
  stone: 
  

  

  Lime 
  29.05 
  

  

  Magnesia 
  12.80 
  

  

  Ferric 
  oxid 
  1 
  . 
  02 
  

  

  Alumina 
  .46 
  

  

  Carbonic 
  acid 
  : 
  38.60 
  

  

  Insoluble 
  residue 
  18.04 
  

  

  99.97 
  

  

  The 
  Trenton 
  limestone 
  is 
  exposed 
  about 
  one 
  and 
  one 
  half 
  miles 
  

   east 
  of 
  the 
  canal 
  and 
  the 
  section 
  is 
  very 
  similar 
  to 
  that 
  found 
  at 
  

   Glens 
  Falls, 
  the 
  upper 
  layers 
  being 
  somewhat 
  impure 
  and 
  the 
  

   lower 
  layers 
  showing 
  8 
  feet 
  of 
  black 
  limestone 
  evidently 
  of 
  con- 
  

   siderable 
  purity. 
  

  

  St 
  Lawrence 
  county 
  

  

  The 
  Trenton-Chazy 
  limestones 
  extend 
  along 
  the 
  St 
  Lawrence 
  

   river 
  from 
  Chippewa 
  Bay 
  to 
  the 
  northeastern 
  edge 
  of 
  the 
  county. 
  

   Its 
  southeastern 
  boundary 
  passes 
  through 
  Flackville, 
  Norwood, 
  

   North 
  Stockholm, 
  Brasher 
  Falls 
  and 
  Fort 
  Covington 
  Center. 
  

  

  At 
  Ogdensburg 
  the 
  stone 
  has 
  been 
  quarried 
  for 
  lime 
  manufac- 
  

   ture 
  about 
  a 
  mile 
  west 
  of 
  the 
  town. 
  The 
  stone 
  is 
  thin 
  bedded 
  

   and 
  only 
  the 
  upper 
  layers 
  of 
  the 
  quarry 
  are 
  used 
  for 
  lime. 
  

  

  The 
  following 
  analyses 
  show 
  not 
  only 
  the 
  dolomitic 
  character 
  

   of 
  the 
  rock 
  but 
  also 
  the 
  greater 
  freedom 
  from 
  silica 
  of 
  the 
  upper 
  

   layers. 
  

  

  Upper 
  stone, 
  Howard's 
  quarry, 
  Ogdensburg 
  : 
  

  

  Silica 
  . 
  . 
  4.42 
  

  

  Alumina 
  2 
  . 
  23 
  

  

  Ferric 
  oxid 
  .16 
  

  

  Lime 
  carbonate 
  55 
  . 
  87 
  

  

  Magnesia 
  carbonate 
  37 
  . 
  74 
  

  

  100.42 
  

  

  