﻿352 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  physical 
  composition 
  of 
  the 
  strata 
  are 
  for 
  a 
  considerable 
  extent 
  

   suggestive 
  of 
  the 
  beds 
  beneath. 
  The 
  differences 
  in 
  the 
  succession 
  

   here 
  and 
  at 
  the 
  nearest 
  section 
  to 
  the 
  eastward 
  where 
  the 
  faunas 
  

   have 
  been 
  carefully 
  studied, 
  are 
  quite 
  marked. 
  Along 
  the 
  meridian 
  

   of 
  Canandaigua 
  lake, 
  in 
  Ontario 
  county, 
  the 
  black 
  Marcellus 
  

   shales 
  are 
  capped 
  by 
  several 
  feet 
  of 
  light 
  gray 
  limestones 
  (basal 
  

   limestones*), 
  rich 
  in 
  the 
  characteristic 
  forms 
  of 
  the 
  Hamilton 
  

   division 
  and 
  especially 
  prolific 
  toward 
  the 
  top 
  in 
  corals. 
  These 
  

   pass 
  gradually 
  into 
  a 
  considerable 
  thickness 
  of 
  argillaceous 
  shales 
  

   above, 
  which 
  are 
  interrupted 
  by 
  a 
  sudden 
  and 
  brief 
  return 
  of 
  the 
  

   black 
  shales 
  with 
  the 
  Marcellus 
  fauna. 
  This 
  returning 
  fauna 
  has 
  

   been 
  described 
  by 
  the 
  writer 
  as 
  "recurrent 
  Marcellus" 
  and 
  its 
  

   appearance 
  has 
  been 
  noted 
  by 
  Dr. 
  D. 
  F. 
  Lincoln 
  still 
  further 
  east- 
  

   ward 
  on 
  the 
  shore 
  of 
  Seneca 
  lake. 
  But 
  in 
  Livingston 
  county 
  the 
  

   basal 
  limestones 
  with 
  their 
  rich 
  fauna 
  have 
  disappeared. 
  There 
  

   is 
  no 
  good 
  evidence 
  of 
  an 
  abrupt 
  return 
  of 
  the 
  black 
  shales 
  and 
  

   their 
  fossils, 
  but 
  the 
  entire 
  lower 
  portion 
  of 
  the 
  Hamilton 
  division 
  

   is 
  a 
  mass 
  of 
  dark 
  compact 
  and 
  very 
  sparsely 
  fossiliferous 
  shale 
  

   beds 
  characterized 
  by 
  their 
  distinct 
  layers 
  of 
  Liorhynchus 
  

   multicosta. 
  

  

  The 
  great 
  beds 
  of 
  highly 
  fossiliferous 
  Moscow 
  shales 
  overlying 
  

   the 
  Encrinal 
  limestome 
  at 
  560 
  feet 
  vary 
  so 
  little 
  in 
  physical 
  

   characters 
  and 
  the 
  composition 
  of 
  their 
  faunas 
  throughout 
  their 
  

   extent 
  and 
  to 
  the 
  top 
  of 
  their 
  section 
  that 
  a 
  recapitulation 
  of 
  

   their 
  relations 
  is 
  unnecessary. 
  

  

  The 
  Geological 
  horizons 
  of 
  the 
  recorded 
  section 
  of 
  the 
  Livonia 
  

   Shaft 
  and 
  their 
  thickness 
  briefly 
  stated. 
  

  

  f 
  Upper 
  or 
  Moscow 
  shales 
  . 
  . 
  . 
  225' 
  — 
  560' 
  =345' 
  

   Hamilton 
  group 
  ) 
  Encrinal 
  limestone 
  560' 
  — 
  562 
  = 
  2* 
  

  

  ( 
  Lower 
  shales 
  562' 
  — 
  650 
  = 
  98 
  

  

  Marcellus 
  group 
  650* 
  — 
  866£*=216£' 
  

  

  Corniferous 
  limestone 
  866f 
  — 
  998i'=132i' 
  

  

  Schoharie 
  grit 
  M 
  901' 
  -1006' 
  = 
  5' 
  

  

  Oriskany 
  sandstone 
  ) 
  

  

  Tentaculite 
  limestone 
  1006* 
  — 
  1045(?)= 
  89' 
  

  

  Waterlime 
  group 
  1045'(?) 
  

  

  * 
  Clarke 
  in 
  Annual 
  Report 
  of 
  State 
  Geologist 
  for 
  1886. 
  

  

  