﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  189" 
  

  

  XXVIII 
  W 
  1 
  . 
  Perhaps 
  one 
  half 
  mile 
  farther 
  west 
  and 
  some 
  170 
  

   feet 
  lower 
  along 
  the 
  banks 
  of 
  a 
  brook 
  to 
  the 
  south 
  of 
  the 
  road 
  is 
  a 
  

   good 
  exposure 
  of 
  bluish, 
  argillaceous 
  shales. 
  Stratigraphically 
  

   these 
  shales 
  belong 
  in 
  the 
  lower 
  part 
  of 
  the 
  covered 
  interval 
  of 
  

   Y 
  6 
  and 
  being 
  in 
  the 
  Ithaca 
  formation 
  indicate 
  that 
  the 
  greater 
  

   part 
  of 
  the 
  zone 
  Y 
  6 
  belongs 
  in 
  that 
  formation. 
  The 
  species 
  found 
  

   at 
  this 
  locality 
  are 
  the 
  following: 
  

  

  1 
  Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  (c) 
  

  

  Some 
  of 
  the 
  specimens 
  are 
  very 
  wide 
  and 
  mucronate. 
  

  

  2 
  Spirifer 
  mesastrialis 
  Hall 
  (rr) 
  

  

  3 
  S. 
  fimbriatus 
  (Con.) 
  Bill. 
  (rr) 
  

  

  4 
  Ambocoelia 
  umbonata 
  (Con.) 
  Hall 
  (?) 
  (rr) 
  

  

  Imperfectly 
  preserved. 
  

  

  5 
  Sphenotus 
  truncatus 
  (Con.) 
  Hall 
  (rr) 
  

  

  6 
  Paracyclas 
  tenuis 
  Hall 
  (rr) 
  

  

  7 
  Liopteria 
  dekayi 
  Hall 
  (rr) 
  

  

  8 
  Goniophora 
  sp. 
  (rr) 
  

  

  Only 
  posterior 
  part 
  of 
  specimen 
  preserved. 
  

  

  9 
  Tentaculites 
  sp. 
  (rr) 
  

  

  10 
  Grammysia 
  subarcuata 
  Hall 
  (rr) 
  

  

  11 
  Crinoid 
  segments 
  

  

  In 
  the 
  above 
  section, 
  if 
  the 
  top 
  of 
  the 
  Hamilton 
  formation 
  has 
  

   been 
  correctly 
  located 
  at 
  Y 
  3 
  then 
  it 
  gives 
  information 
  upon 
  which 
  

   an 
  estimate 
  of 
  the 
  thickness 
  of 
  the 
  Marcellus 
  and 
  Hamilton 
  for- 
  

   mations 
  may 
  be 
  made. 
  The 
  barometer 
  made 
  West 
  Fulton 
  about 
  

   450 
  feet 
  above 
  the 
  Schoharie 
  river 
  level, 
  while 
  in 
  Sherwood's 
  

   section 
  the 
  thickness 
  of 
  the 
  rocks 
  from 
  the 
  top 
  of 
  the 
  Helderberg 
  

   limestone 
  to 
  the 
  base 
  of 
  Wauhalla 
  mountain, 
  which 
  is 
  about 
  oppo- 
  

   site 
  the 
  mouth 
  of 
  Panther 
  creek, 
  is 
  given 
  as 
  920 
  feet 
  a 
  . 
  This 
  gives 
  

   920+450+655=2025 
  feet 
  minus 
  the 
  amount 
  of 
  dip 
  from 
  the 
  mouth 
  

   of 
  Panther 
  creek 
  to 
  the 
  bridge 
  across 
  the 
  creek 
  west 
  of 
  West 
  Ful- 
  

   ton 
  for 
  the 
  thickness 
  of 
  the 
  Marcellus 
  and 
  Hamilton 
  formations. 
  

   If 
  in 
  section 
  XXIX 
  A 
  east 
  of 
  Breakabeen 
  and 
  Wauhalla 
  mountain 
  

   the 
  zone 
  A 
  9 
  , 
  585 
  feet 
  above 
  the 
  Schoharie 
  river, 
  marks 
  the 
  top 
  of 
  

   the 
  Hamilton 
  then 
  it 
  is 
  approximately 
  485 
  feet 
  lower 
  than 
  in 
  the 
  

   section 
  XXVIII 
  Y 
  and 
  since 
  the 
  distance 
  between 
  the 
  two 
  locali- 
  

   ty 
  Proc. 
  Amer. 
  philosophical 
  soc, 
  1878, 
  17 
  :34S-19. 
  

  

  