﻿440 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  South 
  of 
  Leyden 
  and 
  below 
  the 
  railroad 
  level 
  is 
  a 
  large 
  quarrf 
  

   of 
  black, 
  finely 
  crystalline 
  limestone 
  on 
  the 
  land 
  of 
  Mrs 
  Christy. 
  

   The 
  stone 
  has 
  thus 
  far 
  only 
  been 
  used 
  for 
  building 
  purposes. 
  It 
  

   probably 
  represents 
  a 
  lower 
  bed 
  than 
  the 
  stone 
  in 
  Snyder's 
  

   quarry. 
  It 
  is 
  of 
  greater 
  purity 
  however 
  as 
  shown 
  by 
  the 
  follow- 
  

   ing 
  analysis: 
  

  

  Silica 
  1.44 
  

  

  Alumina 
  

  

  Ferric 
  oxid 
  

  

  Lime 
  carbonate 
  97 
  . 
  36 
  

  

  Magnesia 
  1 
  . 
  04 
  

  

  i 
  0.83 
  

  

  100.67 
  

  

  The 
  Trenton 
  limestone 
  has 
  been 
  quarried 
  for 
  lime 
  burning 
  at 
  

   Collinsville 
  three 
  miles 
  north 
  of 
  Port 
  Leyden. 
  The 
  rock 
  here 
  as 
  

   exposed 
  in 
  Roberts 
  lime 
  quarry 
  is 
  a 
  coarse 
  grained, 
  gray 
  stone, 
  

   in 
  thin 
  layers 
  2 
  to 
  8 
  inches 
  thick 
  and 
  often 
  containing 
  irregular 
  

   partings 
  of 
  bituminous 
  shale. 
  They 
  predominate 
  at 
  times 
  so 
  as 
  

   to 
  give 
  the 
  rock 
  a 
  shaly 
  character 
  and 
  such 
  portions 
  are 
  discard- 
  

   ed. 
  The 
  stone 
  makes 
  a 
  white 
  lime 
  as 
  might 
  be 
  expected 
  from 
  its 
  

   low 
  silica 
  and 
  iron 
  percentage. 
  

  

  The 
  composition 
  of 
  the 
  stone 
  as 
  analyzed 
  by 
  Mr 
  Newland 
  is 
  as 
  

   follows: 
  

  

  Silica 
  3.09 
  

  

  Alumina 
  1.15 
  

  

  Ferric 
  oxid 
  , 
  .49 
  

  

  Lime 
  carbonate 
  94.11 
  

  

  Magnesium 
  carbonate 
  1.63 
  

  

  100.47 
  

  

  At 
  Lowville 
  the 
  Trenton 
  limestone 
  is 
  exposed 
  in 
  J. 
  Water's 
  

   quarry, 
  one 
  and 
  one 
  half 
  miles 
  north 
  of 
  the 
  town 
  and 
  along 
  the 
  

   Rome, 
  Watertown 
  & 
  Ogdensburg 
  R. 
  R. 
  

  

  The 
  upper 
  layers 
  are 
  a 
  black 
  limestone 
  with 
  calcite 
  spots, 
  while 
  

   the 
  lower 
  ones 
  are 
  a 
  light 
  gray, 
  finely 
  crystalline 
  stone, 
  and 
  it 
  is 
  

   these 
  latter 
  ones 
  which 
  are 
  chiefly 
  used. 
  

  

  