﻿830 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  says 
  I^rof 
  . 
  Hall, 
  " 
  are 
  a 
  green 
  and 
  ashen 
  marl, 
  with 
  seams 
  of 
  fibrous 
  

   gypsum 
  and 
  red 
  or 
  transparent 
  selenite. 
  It 
  occurs 
  in 
  the 
  vicinity 
  

   of 
  Lyons 
  and 
  numerous 
  points 
  farther 
  west 
  ". 
  

  

  The 
  third 
  division 
  contains 
  large 
  gypsum 
  beds 
  and 
  is 
  probably 
  not 
  

   suitable 
  for 
  use. 
  

  

  The 
  Salina 
  shale, 
  as 
  stated 
  above, 
  is 
  worked 
  at 
  Warner, 
  Onon- 
  

   daga 
  CO., 
  by 
  the 
  Onondaga 
  vitrified 
  brick 
  co. 
  The 
  shale 
  as 
  exposed 
  

   in 
  their 
  bank 
  consists 
  of 
  a 
  green 
  or 
  red, 
  soft, 
  argillaceous 
  shale, 
  

   of 
  considerable 
  impurity, 
  as 
  the 
  following 
  analyses 
  furnished 
  by 
  

   the 
  company 
  show. 
  

  

  Calcareous 
  Red 
  Blue 
  

  

  layer 
  in 
  bank 
  shale 
  shale 
  

  

  Silica 
  25.40 
  52.30 
  57.79 
  

  

  Alumina 
  9.46 
  18.85 
  16.15 
  

  

  Ferric 
  oxid 
  2.24 
  6.55 
  5.20 
  

  

  Lime 
  22.81 
  3.36 
  2.73 
  

  

  Magnesia 
  10.39 
  4.49 
  4.67 
  

  

  Carbonic 
  acid 
  20.96 
  3.04 
  3.42 
  

  

  Potash 
  95 
  4.65 
  4.11 
  

  

  Soda 
  1.35 
  1.22 
  

  

  Water 
  and 
  organic 
  matter 
  7.60 
  5.30 
  4.50 
  

  

  99.81 
  99.89 
  99.79 
  

  

  I 
  

  

  Total 
  fluxing 
  impurities.. 
  . 
  36.39 
  20.40 
  17.93 
  

  

  These 
  shales 
  must 
  be 
  quite 
  fusible 
  owing 
  to 
  their 
  high 
  per- 
  

   centage 
  of 
  fluxing 
  impurities. 
  

  

  At 
  the 
  works 
  of 
  the 
  Onondaga 
  vitrified 
  brick 
  co., 
  the 
  shale 
  crops 
  

   out 
  in 
  considerable 
  thickness 
  near 
  the 
  yard, 
  and 
  is 
  of 
  various 
  shades 
  

   of 
  red, 
  green, 
  and 
  gray; 
  it 
  disintegrates 
  very 
  rapidly, 
  and 
  the 
  whole 
  

   bank 
  is 
  traversed 
  by 
  numerous 
  cracks, 
  so 
  that 
  a 
  small 
  blast 
  brings 
  

   down 
  a 
  large 
  amount. 
  The 
  material 
  is 
  mixed 
  with 
  a 
  surface 
  clay 
  

   in 
  the 
  proportion 
  of 
  1 
  of 
  clay 
  to 
  3 
  of 
  shale; 
  it 
  is 
  ground 
  in 
  a 
  dry 
  

   pan, 
  and 
  molded 
  in 
  an 
  auger 
  machine; 
  the 
  green 
  bricks 
  are 
  dried 
  

   in 
  tunnels 
  and 
  burned 
  in 
  circular 
  kilns; 
  the 
  product 
  is 
  of 
  a 
  red 
  color, 
  

   and 
  very 
  hard. 
  

  

  Marcellus 
  shale. 
  This 
  formation 
  presents 
  numerous 
  undesira- 
  

   ble 
  features, 
  so 
  that 
  its 
  occurrence 
  is 
  of 
  little 
  importance 
  to 
  clay 
  

  

  