﻿226 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  acter 
  of 
  the 
  beds 
  changing 
  to 
  soft 
  clayey 
  shale 
  with 
  thin 
  

   sandstones. 
  In 
  the 
  lower 
  part 
  of 
  this 
  bed 
  fossils 
  are 
  of 
  rare 
  

   occurrence, 
  though 
  sometimes 
  a 
  thin 
  concretionary 
  layer 
  may 
  be 
  

   found 
  to 
  contain 
  many 
  good 
  specimens. 
  

  

  Next 
  above 
  are 
  fifteen 
  to 
  twenty 
  feet 
  of 
  soft 
  clayey 
  olive 
  

   shales 
  in 
  which 
  the 
  impressions 
  and 
  casts 
  of 
  fossils 
  are 
  very 
  

   abundant. 
  Overlying 
  these 
  shales 
  are 
  about 
  six 
  feet 
  of 
  hard 
  

   bluish, 
  non-fossiliferous 
  sandstones, 
  then 
  soft 
  clay 
  shales 
  with 
  

   recurring 
  sandy 
  layers 
  for 
  100 
  feet 
  or 
  more 
  to 
  the 
  Second 
  Black 
  

   Band. 
  

  

  In 
  the 
  ravines 
  north 
  of 
  the 
  village 
  of 
  Naples, 
  on 
  both 
  sides 
  of 
  

   the 
  vallejr, 
  there 
  occurs 
  a 
  concretionary 
  calcareous 
  layer, 
  of 
  

   pinkish 
  color, 
  three 
  to 
  four 
  inches 
  thick, 
  a 
  few 
  feet 
  above 
  the 
  

   thick 
  sandstone 
  just 
  mentioned. 
  It 
  is 
  exposed 
  near 
  the 
  highway 
  

   on 
  the 
  hill 
  between 
  Middlesex 
  and 
  Potter 
  Centre, 
  and 
  also 
  at 
  

   Belknap's 
  gully, 
  two 
  miles 
  north 
  of 
  Branchport, 
  in 
  Yates 
  

   county, 
  where 
  it 
  is 
  a 
  layer 
  of 
  clear, 
  hard 
  limestone 
  of 
  a 
  light 
  

   blue 
  color 
  and 
  is 
  eight 
  to 
  ten 
  inches 
  thick. 
  It 
  contains 
  many 
  

   fine 
  fossils 
  wherever 
  exposed, 
  but 
  appears 
  to 
  be 
  richer 
  in 
  Parrish 
  

   Gully, 
  two 
  miles 
  northeast 
  of 
  Naples, 
  than 
  elsewhere. 
  Along 
  

   Honeoye 
  and 
  Conesus 
  lakes, 
  and 
  at 
  many 
  places 
  between 
  them, 
  

   there 
  occurs 
  a 
  layer 
  of 
  concretions 
  containing 
  many 
  fossils, 
  

   which 
  appears 
  to 
  be 
  in 
  the 
  same 
  horizon 
  as 
  the 
  thin 
  limestone. 
  

  

  Flat 
  concretions, 
  which 
  in 
  rare 
  instances 
  contain 
  fossils, 
  are 
  

   abundant, 
  sometimes 
  constituting 
  layers 
  between 
  the 
  sandstones 
  

   and 
  the 
  second 
  black 
  band. 
  

  

  The 
  second 
  black 
  band 
  is, 
  at 
  Branchport 
  and 
  Naples, 
  rather 
  

   more 
  than 
  200 
  feet 
  above 
  the 
  lower 
  black 
  band, 
  and 
  in 
  Parrish 
  

   Gully 
  it 
  is 
  twenty 
  feet 
  six 
  inches 
  thick. 
  It 
  is 
  of 
  precisely 
  the 
  

   same 
  character 
  and 
  appearance 
  as 
  the 
  lower 
  black 
  band, 
  and 
  

   they 
  both 
  resemble 
  so 
  closely 
  the 
  black 
  shales 
  in 
  the 
  lower 
  part 
  

   of 
  the 
  Genesee 
  group 
  that 
  it 
  is 
  only 
  by 
  examination 
  of 
  the 
  

   adjacent 
  strata 
  that 
  the 
  observer 
  can 
  determine 
  the 
  horizon 
  of 
  

   either. 
  

  

  Toward 
  the 
  west 
  these 
  two 
  black 
  bands 
  continue 
  across 
  the 
  

   salt 
  fields, 
  becoming, 
  if 
  possible, 
  more 
  densely 
  black 
  and 
  bitumin- 
  

   ous, 
  and 
  the 
  upper 
  one 
  increasing 
  to 
  nearly 
  100 
  feet 
  in 
  thickness 
  

   near 
  the 
  southwest 
  corner 
  of 
  Genesee 
  county. 
  The 
  shales 
  

   between 
  them, 
  however, 
  become 
  very 
  much 
  softer 
  and 
  lighter 
  

  

  