﻿240 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  This 
  Onondaga 
  limestone 
  was 
  two 
  and 
  one-half 
  feet 
  thick 
  in 
  

   the 
  shaft. 
  At 
  the 
  Oatka 
  falls 
  below 
  Le 
  Roy 
  it 
  is 
  ten 
  to 
  twelve 
  

   feet 
  thick. 
  

  

  The 
  change 
  from 
  the 
  soft 
  black 
  Marcel] 
  us 
  shale 
  to 
  the 
  hard, 
  

   blue 
  Corniferous 
  limestone 
  is 
  very 
  noticeable 
  to 
  the 
  driller, 
  and 
  

   gives 
  him 
  opportunity 
  for 
  accurately 
  determining 
  the 
  depth 
  in 
  

   his 
  well 
  to 
  the 
  top 
  of 
  the 
  formation. 
  

  

  It 
  is 
  more 
  difficult 
  to 
  ascertain 
  the 
  precise 
  point 
  at 
  which 
  the 
  

   drill 
  reaches 
  the 
  bottom 
  of 
  the 
  Corniferous, 
  the 
  Oriskany 
  sand- 
  

   stone 
  being 
  of 
  too 
  slight 
  a 
  thickness 
  to 
  attract 
  attention, 
  and 
  the 
  

   next 
  rock 
  below 
  differs 
  but 
  slightly 
  in 
  texture. 
  

  

  The 
  change 
  in 
  color 
  from 
  bluish 
  gray 
  to 
  pinkish 
  gray 
  is 
  the 
  

   principal 
  indication 
  of 
  the 
  change 
  in 
  the 
  rock, 
  and 
  may 
  not, 
  in 
  all 
  

   cases, 
  be 
  noticed 
  immediately. 
  The 
  difference 
  in 
  the 
  figures 
  in 
  

   the 
  records 
  is 
  probabty 
  due 
  more 
  to 
  this 
  cause 
  than 
  to 
  variation 
  

   in 
  the 
  thickness 
  of 
  the 
  strata. 
  

  

  In 
  the 
  upper 
  part 
  of 
  the 
  Corniferous 
  beds 
  shaly 
  partings 
  from 
  

   a 
  fraction 
  of 
  an 
  inch 
  to 
  four 
  inches 
  thick 
  occur 
  at 
  irregular 
  inter- 
  

   vals, 
  and 
  separate 
  the 
  strata 
  into 
  layers 
  from 
  a 
  few 
  inches 
  to 
  

   several 
  feet 
  in 
  thickness. 
  

  

  At 
  the 
  depth- 
  of 
  88 
  S 
  feet 
  in 
  the 
  shaft 
  and 
  twenty-two 
  feet 
  below 
  

   the 
  top 
  of 
  the 
  Corniferous 
  limestone, 
  interst 
  ratified 
  between 
  thick 
  

   layers 
  of 
  hard, 
  cherty 
  limestone, 
  there 
  occurs 
  a 
  very 
  peculiar 
  soft 
  

   laj 
  er 
  about 
  four 
  inches 
  thick 
  that 
  differs 
  widely 
  from 
  the 
  usual 
  

   shaly 
  partings 
  in 
  that 
  formation, 
  in 
  regard 
  to 
  the 
  nature 
  and 
  

   origin 
  of 
  which 
  some 
  difference 
  of 
  opinion 
  has 
  been 
  expressed 
  by 
  

   the 
  few 
  experts 
  to 
  whom 
  specimens 
  have 
  been 
  submitted. 
  

  

  It 
  is 
  glistening, 
  brownish 
  gray 
  in 
  color, 
  with 
  an 
  appearance 
  

   strongly 
  suggestive 
  of 
  a 
  mica 
  schist 
  or 
  decomposing 
  volcanic 
  tufa. 
  

   It 
  is 
  rather 
  shaly 
  and 
  crumbles 
  quickly 
  when 
  exposed. 
  

  

  There 
  is 
  very 
  little 
  doubt 
  that 
  it 
  is 
  a 
  deposit 
  of 
  thin, 
  minute 
  hex- 
  

   agonal 
  crystals 
  flakes 
  of 
  v 
  sulphate 
  of 
  lime, 
  the 
  darker 
  particles 
  

   perhaps 
  colored 
  by 
  iron. 
  

  

  No 
  fossils 
  were 
  observed 
  in 
  this 
  layer, 
  but 
  an 
  irregular 
  layer 
  of 
  

   soft, 
  shaly 
  limestone 
  about 
  an 
  inch 
  thick, 
  which 
  separates 
  it 
  from 
  

   the 
  hard 
  overlying 
  limest 
  <ne 
  stratum, 
  contains 
  many 
  specimens 
  

   common 
  to 
  the 
  adjacent 
  strata. 
  

  

  The 
  layer 
  appeared 
  also 
  in 
  the 
  Greigsville 
  shaft 
  and 
  the 
  Lehigh 
  

   shaft, 
  maintaining 
  its 
  thickness 
  and 
  presenting 
  no 
  apparent 
  dif- 
  

   ference 
  in 
  character. 
  

  

  