﻿836 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Ferric 
  oxid 
  9.07 
  

  

  Lime 
  82 
  

  

  Magnesia 
  2.32 
  

  

  Alkalis 
  3.78 
  

  

  Total 
  impurities 
  16.97 
  

  

  Tlie 
  principal 
  output 
  of 
  these 
  works 
  is 
  fireproofing. 
  On 
  ac- 
  

   count 
  of 
  its 
  softness 
  the 
  shale 
  is 
  easily 
  mined 
  and 
  transported 
  in 
  

   cars 
  to 
  the 
  dry 
  pans, 
  where 
  it 
  is 
  first 
  ground 
  and 
  then 
  tempered 
  in 
  

   a 
  wet- 
  pan. 
  The 
  tempered 
  material 
  is 
  then 
  conveyed 
  to 
  the 
  upper 
  

   floors 
  and 
  discharged 
  into 
  the 
  usual 
  form 
  of 
  sewer 
  pipe 
  press. 
  

   The 
  glazing 
  of 
  the 
  sewer 
  pipe 
  is 
  done 
  by 
  means 
  of 
  salt. 
  

  

  Chemung. 
  The 
  most 
  southern 
  shale 
  formations 
  of 
  New 
  York 
  

   state 
  are 
  included 
  under 
  this 
  head. 
  As 
  a 
  whole, 
  the 
  group 
  con- 
  

   sists 
  of 
  interbedded 
  shales 
  and 
  sandstones, 
  the 
  former 
  prominent 
  

   toward 
  the 
  west, 
  the 
  latter 
  becoming 
  predominant 
  to 
  the 
  east. 
  

   The 
  shales 
  vary 
  in 
  color, 
  and 
  are 
  black, 
  olive 
  or 
  green. 
  The 
  shales 
  

   sometimes 
  pass 
  into 
  shaly 
  sandstones 
  ; 
  these 
  are 
  often 
  highly 
  mica- 
  

   ceous. 
  The 
  members 
  of 
  the 
  group 
  recognized 
  by 
  Prof. 
  Hall, 
  be- 
  

   ginning 
  at 
  the 
  top, 
  are 
  : 
  

  

  6 
  Sandstone 
  and 
  conglomerate 
  

  

  6 
  Old 
  red 
  sandstone 
  

  

  2 
  Black, 
  slaty 
  shale 
  

  

  3 
  Green 
  shale 
  with 
  gray 
  sandstones 
  

  

  4 
  Gray 
  and 
  olive 
  shales 
  and 
  shaly 
  sandstone 
  

   1 
  Olive, 
  shaly 
  sandstone 
  

  

  Portage 
  sandstone 
  

  

  Of 
  these 
  members 
  2, 
  3 
  and 
  4 
  are 
  the 
  most 
  important 
  to 
  clay 
  

   workers 
  ; 
  the 
  beds 
  of 
  shale 
  exposed 
  are 
  often 
  20 
  or 
  30 
  feet 
  in 
  thick- 
  

   ness 
  and 
  free 
  from 
  sandstone. 
  

  

  ^' 
  On 
  the 
  Genesee 
  river 
  the 
  shale 
  is 
  often 
  in 
  thick 
  beds 
  of 
  a 
  

   bright 
  green 
  color 
  and 
  scarcely 
  interrupted 
  by 
  sandy 
  layers 
  '\ 
  

  

  '' 
  Westward 
  from 
  the 
  Genesee 
  river 
  there 
  appears 
  to 
  be 
  a 
  con- 
  

   stant 
  augmentation 
  in 
  the 
  quantity 
  of 
  the 
  green 
  shale, 
  which 
  is 
  

  

  