﻿ECONOMIC 
  GEOLOGY 
  225 
  

  

  Cambrian 
  age, 
  quarried 
  at 
  Fort 
  Ann 
  in 
  Washington 
  county, 
  has 
  

   been 
  ground 
  for 
  use 
  as 
  a 
  wood 
  filler. 
  It 
  has 
  also 
  been 
  used 
  at 
  

   the 
  Troy 
  Iron 
  Works 
  for 
  lining 
  Bessemer 
  converters 
  and 
  for 
  

   similar 
  refractory 
  purposes. 
  A 
  similar 
  rock 
  is 
  quarried 
  for 
  wood 
  

   filler 
  at 
  Billings, 
  Dutchess 
  county. 
  

  

  At 
  Ellenville, 
  Ulster 
  county, 
  quarries 
  and 
  mills 
  are 
  operated 
  

   by 
  the 
  Crystal 
  Sand 
  Manufacturing 
  Company. 
  The 
  product 
  

   which 
  is 
  called 
  ^ 
  glass 
  sand 
  ' 
  is 
  obtained 
  from 
  the 
  Shawangunk 
  

   grit, 
  which 
  is 
  crushed 
  very 
  fine. 
  Much 
  of 
  it 
  is 
  sent 
  to 
  the 
  glass 
  

   works 
  at 
  Corning. 
  

  

  Glass 
  Sand 
  

  

  Large 
  glass 
  sand 
  deposits 
  of 
  Quaternary 
  age 
  occur 
  at 
  Durham- 
  

   villei 
  near 
  Oneida 
  lake. 
  They 
  are 
  operated 
  by 
  William 
  Williams. 
  

   The 
  sand 
  is 
  not 
  as 
  white 
  nor 
  as 
  fine 
  as 
  that 
  from 
  Ellenville, 
  and 
  

   is 
  used 
  for 
  the 
  commoner 
  grades 
  of 
  glassware. 
  Much 
  of 
  it 
  is 
  

   sihipped 
  to 
  Lockport. 
  The 
  sand 
  contains 
  97-97.5 
  5^ 
  Si. 
  02. 
  

  

  Glass 
  was 
  formerly 
  made 
  at 
  Sand 
  Lake 
  in 
  Rensselaer 
  County. 
  

  

  An 
  artificial 
  glass 
  sand 
  made 
  at 
  Ellenville 
  is 
  described 
  under 
  

   the 
  previous 
  head. 
  

  

  Molding 
  Sand 
  

  

  Sand 
  for 
  molding 
  is 
  found 
  in 
  southern 
  Albany 
  county, 
  near 
  the 
  

   Hudson 
  river, 
  immediaitely 
  below 
  the 
  ■surface 
  soil. 
  When 
  this 
  is 
  

   removed 
  the 
  sand 
  is 
  skimmed 
  off 
  to 
  a 
  depth 
  of 
  about 
  six 
  inches. 
  

   It 
  is 
  quite 
  extensively 
  shipped 
  from 
  the 
  town 
  of 
  Bethlehem. 
  

   This 
  is 
  a 
  Quaternary 
  deposit. 
  Near 
  Poughkeepsie 
  molding 
  

   sand 
  is 
  obtained 
  from 
  a 
  silicious 
  Potsdam 
  limestone, 
  which, 
  in 
  

   decomposing, 
  leaves 
  a 
  fine 
  sand 
  which 
  has 
  been 
  found 
  very 
  satis- 
  

   factory 
  for 
  this 
  purpose. 
  

  

  Garnet 
  

  

  Garnet 
  is 
  mined 
  or 
  quarried 
  in 
  New 
  York 
  state 
  in 
  and 
  near 
  

   the 
  valley 
  of 
  the 
  upper 
  Hudson 
  river 
  in 
  Warren 
  county 
  on 
  the 
  

   borders 
  of 
  the 
  Adirondack 
  region. 
  It 
  all 
  appears 
  to 
  be 
  of 
  the 
  

   common 
  variety, 
  Almandite, 
  and 
  occurs 
  in 
  a 
  formation 
  of 
  crys- 
  

   talline 
  limestone 
  which 
  appears 
  to 
  form 
  the 
  bed-rock 
  of 
  the 
  val- 
  

   ley 
  in 
  the 
  vicinity 
  of 
  North 
  Creek 
  and 
  Minerva 
  and 
  in 
  gneissio 
  

  

  