﻿434 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  rock 
  in 
  appearance 
  is 
  very 
  free 
  from 
  impurities. 
  The 
  fol- 
  

   lowing 
  analysis 
  of 
  the 
  rock 
  was 
  furnished 
  by 
  the 
  superintendent 
  

   of 
  the 
  company: 
  

  

  Silica 
  .70 
  

  

  Ferric 
  oxid 
  .25 
  

  

  Alumina 
  .37 
  

  

  Lime 
  30.63 
  

  

  Magnesia 
  20 
  . 
  25 
  

  

  Soda 
  12 
  

  

  Potash 
  46 
  

  

  The 
  limestones 
  in 
  the 
  western 
  part 
  of 
  the 
  county 
  are 
  usually 
  a 
  

   hard, 
  fine 
  grained 
  bluish 
  gray 
  rock, 
  containing 
  less 
  magnesia 
  

   than 
  the 
  whiter 
  phases 
  to 
  the 
  southeast 
  and 
  east. 
  

  

  It 
  has 
  been 
  used 
  for 
  lime 
  but 
  on 
  the 
  whole 
  is 
  too 
  siliceous 
  so 
  

   that 
  the 
  resulting 
  lime 
  would 
  be 
  lean. 
  

  

  Large 
  quarries 
  have 
  been 
  opened 
  in 
  this 
  belt 
  of 
  Calciferous 
  as 
  

   its 
  siliceous 
  nature 
  makes 
  it 
  a 
  splendid 
  material 
  for 
  roads. 
  An 
  

   analysis 
  of 
  this 
  stone 
  from 
  Clinton 
  point 
  two 
  miles 
  above 
  New 
  

   Hamburg 
  gave: 
  

  

  Lime 
  29.07 
  

  

  Magnesia 
  16 
  . 
  29 
  

  

  Carbonic 
  acid 
  40 
  .76 
  

  

  Alumina 
  2.33 
  

  

  , 
  Ferric 
  oxid 
  .47 
  

  

  Silica 
  10.17 
  

  

  99.09 
  

  

  Erie 
  county 
  

  

  The 
  only 
  limestone 
  formations 
  represented 
  in 
  this 
  county 
  are 
  

  

  the 
  hydraulic 
  or 
  water 
  limestones, 
  the 
  Onondaga 
  and 
  the 
  

  

  Oorniferous. 
  According 
  to 
  Bishop 
  : 
  a 
  

  

  The 
  northern 
  edge 
  of 
  the 
  Corniferous 
  limestone 
  together 
  

   with 
  the 
  Onondaga 
  limestone 
  and 
  the 
  upper 
  part 
  of 
  the 
  

   hydraulic 
  limestone 
  form 
  a 
  well 
  marked 
  escarpment, 
  which 
  

   runs 
  in 
  a 
  general 
  southwest 
  direction 
  from 
  the 
  Genesee 
  

  

  aGeology 
  of 
  Erie 
  county, 
  15th 
  an. 
  rep't 
  N. 
  Y. 
  state 
  geol. 
  p. 
  305. 
  

  

  