﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  243 
  

  

  3 
  8. 
  granulosus 
  (Con.) 
  H. 
  & 
  C. 
  (rr) 
  

  

  4 
  CJwnetes 
  setigera 
  Hall 
  < 
  (rr) 
  

  

  5 
  Ortlwnota 
  undulata 
  Con. 
  (c) 
  

   "6 
  Nucnlites 
  oblongatus 
  Con. 
  (c) 
  

  

  Small 
  specimens. 
  

  

  7 
  Palaeoneilo 
  constricta 
  (Con.) 
  Hall 
  (rr) 
  

  

  8 
  Grammysia 
  bisulcata 
  (Con.) 
  Hall 
  (rr) 
  

  

  9 
  Pterinopecten 
  vertumnus 
  Hall 
  (?) 
  (rr) 
  

  

  15 
  feet 
  above 
  the 
  base 
  of 
  zone 
  B 
  c 
  and 
  940 
  feet 
  above 
  the 
  top 
  

   of 
  the 
  Onondaga 
  limestone 
  are 
  coarse, 
  bluish, 
  arenaceous 
  shales 
  

   (B 
  7 
  ) 
  containing 
  some 
  fossils 
  as 
  follows: 
  

  

  1 
  Chonetes 
  coronata 
  (Con.) 
  Hall 
  ■ 
  i 
  (r) 
  

  

  2 
  Spirlfer 
  muoronatus 
  (Con.) 
  Bill. 
  (rr) 
  

  

  3 
  Pterinea 
  flabella 
  (Con.) 
  Hall 
  i 
  (r) 
  

  

  4 
  Actinopteria 
  boydi 
  (Con.) 
  Hall 
  

  

  5 
  Nucnlites 
  oblongatus 
  Con. 
  

  

  6 
  Bryozoan 
  (rr) 
  

  

  These 
  are 
  the 
  highest 
  rocks 
  of 
  the 
  section 
  in 
  which 
  Hamilton 
  

   fossils 
  were 
  found 
  and 
  must 
  be 
  regarded 
  as 
  forming 
  the 
  top 
  of 
  

   that 
  formation; 
  in 
  fact 
  the 
  greenish 
  shales 
  of 
  B 
  5 
  , 
  65 
  feet 
  lower, 
  

   are 
  transitional 
  from 
  the 
  Hamilton 
  to 
  the 
  Sherburne 
  formation 
  

   and 
  perhaps 
  might 
  be 
  considered 
  as 
  at 
  its 
  top, 
  but 
  it 
  is 
  thought 
  

   better 
  to 
  classify 
  the 
  succeeding 
  65 
  feet 
  of 
  rocks 
  which 
  contain 
  

   a 
  fair 
  Hamilton 
  fauna 
  with 
  that 
  formation. 
  The 
  difference 
  in 
  

   altitude 
  gives 
  a 
  thickness 
  of 
  at 
  least 
  940 
  feet 
  for 
  the 
  Marcellus 
  

   and 
  Hamilton 
  formations 
  in 
  this 
  section; 
  but 
  where 
  observed 
  

   there 
  is 
  a 
  dip 
  from 
  1|° 
  to 
  2J° 
  a 
  mile 
  to 
  the 
  southwest 
  which 
  

   would 
  add 
  from 
  475 
  to 
  780 
  feet, 
  making 
  the 
  thickness 
  of 
  the 
  

   formation 
  between 
  1415 
  and 
  1720 
  feet. 
  

  

  For 
  about 
  50 
  feet 
  above 
  zone 
  B 
  7 
  the 
  rocks 
  are 
  covered 
  when 
  a 
  

   heavy 
  ledge 
  of 
  coarse 
  grained 
  sandstone 
  (B 
  9 
  ) 
  varying 
  from 
  a 
  

   -slightly 
  greenish 
  gray 
  to 
  bluish 
  gray 
  color 
  and 
  splitting 
  into 
  thin 
  

   layers 
  which 
  in 
  places 
  have 
  a 
  somewhat 
  crossbedded 
  structure, 
  

   is 
  reached 
  in 
  the 
  field 
  on 
  the 
  western 
  side 
  of 
  the 
  road. 
  A 
  little 
  

  

  