﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  the 
  well 
  at 
  Perry, 
  about 
  ten 
  miles 
  nearly 
  due 
  south 
  of 
  Pavilion, 
  

   shows 
  at 
  least 
  477 
  feet 
  of 
  Hamilton 
  rocks, 
  an 
  increase 
  of 
  eleven 
  

   feet 
  to 
  the 
  mile 
  in 
  that 
  direction. 
  

  

  When 
  not 
  covered 
  by 
  drift 
  the 
  shales 
  and 
  limestones 
  of 
  the 
  

   Hamilton 
  group 
  are 
  exposed 
  over 
  a 
  belt 
  of 
  country 
  about 
  ten 
  

   miles 
  wide, 
  extending 
  from 
  east 
  to 
  west 
  across 
  the 
  salt 
  district. 
  

  

  Besides 
  the 
  Ketsof 
  and 
  Greigsville 
  shafts 
  in 
  the 
  Genesee 
  valley, 
  

   the 
  well 
  at 
  York, 
  those 
  of 
  the 
  Genesee 
  Salt 
  Company 
  and 
  the 
  

   Livingston 
  Salt 
  Company 
  at 
  Piffard, 
  those 
  of 
  the 
  Phoenix 
  Salt 
  

   Company 
  near 
  Cuylerville 
  and 
  the 
  Lakeville 
  wells 
  are 
  opened 
  in 
  

   this 
  belt. 
  

  

  In 
  the 
  Oatka 
  valley 
  the 
  more 
  southerly 
  wells 
  of 
  the 
  Le 
  Roy 
  

   Salt 
  Company, 
  the 
  Lehigh 
  shaft, 
  the 
  Junction 
  well 
  and 
  the 
  

   Pavilion 
  well 
  are 
  also 
  located 
  within 
  its 
  limits. 
  

  

  ~No 
  very 
  great 
  change 
  in 
  the 
  character 
  of 
  the 
  rock 
  was 
  

   observed 
  at 
  the 
  depth 
  of 
  797 
  feet 
  in 
  the 
  Livonia 
  shaft, 
  but 
  the 
  

   shale 
  wa* 
  considerable^ 
  darker 
  and 
  Orbiculoidea 
  minuta 
  and 
  

   Liorhynchus 
  limitaris 
  suddenly 
  appeared 
  in 
  great 
  abundance, 
  

   showing 
  that 
  the 
  Marcellus 
  group 
  was 
  reached. 
  It 
  is 
  sixty 
  -nine 
  

   feet 
  thick 
  at 
  Livonia. 
  The 
  records 
  make 
  it 
  fifty-six 
  feet 
  thick 
  at 
  

   the 
  Retsof 
  shaft 
  and 
  sixty-one 
  feet 
  at 
  the 
  Lehigh. 
  

  

  The 
  thinning 
  out 
  appears 
  to 
  be 
  in 
  the 
  black 
  shales 
  which 
  lie 
  

   between 
  the 
  impure 
  limestone 
  at 
  853-854 
  feet 
  and 
  the 
  top 
  of 
  the 
  

   Corniferous, 
  for 
  at 
  the 
  Lehigh 
  sha 
  f 
  t 
  this 
  limestone 
  rests 
  directly 
  

   upon 
  the 
  Corniferous. 
  

  

  The 
  black 
  shales 
  and 
  the 
  upper 
  (Stafford) 
  limestone 
  are 
  well 
  

   exposed 
  at 
  Littleville, 
  near 
  Avon, 
  and 
  in 
  the 
  bed 
  of 
  the 
  Oatka 
  

   creek 
  below 
  Main 
  street 
  bridge 
  in 
  the 
  village 
  of 
  Le 
  Roy. 
  

  

  Several 
  salt 
  wells 
  put 
  down 
  by 
  the 
  Le 
  Roy 
  Salt 
  Company 
  and 
  

   the 
  well 
  in 
  Caledonia 
  have 
  Marcellus 
  shales 
  for 
  their 
  first 
  rock. 
  

  

  The 
  Corniferous 
  or 
  upper 
  Helderberg 
  limestones 
  were 
  135 
  feet 
  

   thick 
  at 
  Livonia. 
  From 
  the 
  records 
  of 
  the 
  other 
  shafts 
  and 
  salt 
  

   wells, 
  it 
  would 
  appear 
  that 
  the 
  thickness 
  of 
  the 
  rocks 
  generally 
  

   regarded 
  as 
  belonging 
  to 
  this 
  group 
  is 
  ten 
  to 
  fifteen 
  feet 
  greater 
  

   in 
  the 
  Genesee 
  and 
  Oatka 
  valleys. 
  

  

  In 
  all 
  the 
  measurements, 
  except 
  at 
  the 
  Livonia 
  shaft, 
  the 
  Onon- 
  

   daga 
  limestone, 
  distinguished 
  mainly 
  by 
  the 
  absence 
  of 
  chert 
  and 
  

   the 
  abundance 
  of 
  corals, 
  is 
  included. 
  

  

  