﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  71 
  

  

  seen 
  from 
  the 
  following 
  list 
  of 
  species 
  obtained 
  as 
  a 
  result 
  of 
  a 
  

   few 
  minutes' 
  collecting 
  from 
  near 
  the 
  top 
  of 
  the 
  section 
  : 
  

  

  1 
  Camarotoecliia 
  eximia 
  (Hall) 
  H. 
  & 
  C. 
  (a) 
  

  

  2 
  G. 
  stevensi 
  (Hall) 
  H. 
  & 
  C. 
  (c) 
  

  

  3 
  Spirifer 
  mesastrialis 
  Hall 
  (rr) 
  

  

  4 
  Ghonetes 
  setigera 
  Hall 
  (r) 
  

  

  5 
  C. 
  scitula 
  Hall 
  (rr) 
  

  

  6 
  Pamcyclas 
  Ivrata 
  (Con.) 
  Hall 
  (r) 
  

  

  7 
  Palcmoneilo 
  maxima 
  (Con.) 
  Hall 
  (r) 
  

  

  8 
  Palaeoneilo 
  cf. 
  muta 
  Hall 
  (r) 
  

  

  9 
  Sphenatus 
  cf. 
  contractus 
  Hall 
  (rr) 
  

  

  Poorly 
  preserved. 
  

  

  1 
  Gomophora 
  sp. 
  (rr) 
  

  

  11 
  Leptodesma 
  rogersi 
  Hall 
  (?) 
  (r) 
  

  

  12 
  JSfucula 
  corouliformis 
  Hall 
  (?) 
  (rr) 
  

  

  13 
  Tentaculites 
  sp. 
  (c) 
  

  

  All 
  very 
  poorly 
  preserved. 
  

  

  XXIII 
  B 
  4 
  . 
  70 
  feet 
  higher 
  is 
  the 
  base 
  of 
  a 
  massive, 
  greenish 
  gray 
  

   coarse 
  grained 
  sandstone 
  forming 
  heavy 
  ledges. 
  On 
  the 
  surface 
  

   the 
  massive 
  layers 
  tend 
  to 
  separate 
  into 
  thinner 
  ones 
  but 
  at 
  a 
  

   little 
  distance 
  from 
  the 
  surface 
  these 
  are 
  firmly 
  united 
  forming 
  

   massive 
  strata. 
  There 
  are 
  also 
  layers 
  which 
  are 
  conspicuously 
  

   crossbedded. 
  This 
  zone 
  has 
  clearly 
  all 
  the 
  lithologic 
  characters 
  

   of 
  the 
  massive 
  sandstones 
  of 
  the 
  Oneonta 
  formation 
  and! 
  repre- 
  

   sents 
  its 
  base 
  on 
  this 
  hill. 
  It 
  will 
  be 
  clearly 
  shown 
  later 
  in 
  this 
  

   report 
  that 
  these 
  sandstones 
  are 
  not 
  found 
  at 
  the 
  same 
  geologic 
  

   horizon 
  from 
  the 
  Chenango 
  valley 
  to 
  Albany 
  co.; 
  but 
  appear 
  

   at 
  a 
  lower 
  horizon 
  as 
  the 
  formation 
  is 
  followed 
  eastward. 
  It 
  is 
  

   probable 
  that 
  the 
  lowest 
  of 
  these 
  heavy 
  greenish 
  gray 
  sandstones 
  

   as 
  exposed 
  at 
  the 
  various 
  localities 
  along 
  the 
  Susquehanna 
  valley 
  

   do 
  not 
  all 
  represent 
  exactly 
  the 
  same 
  geologic 
  horizon, 
  but 
  they 
  

   form 
  an 
  easily 
  recognized 
  dividing 
  line 
  and 
  have 
  been 
  regarded 
  

   as 
  constituting 
  the 
  base 
  of 
  the 
  Oneonta 
  sandstone 
  in 
  this 
  valley. 
  

   In 
  fact 
  it 
  is 
  doubtful 
  if 
  any 
  line 
  can 
  be 
  found 
  between 
  the 
  Ithaca 
  

   and 
  Oneonta 
  formations 
  that 
  can 
  be 
  followed 
  exactly 
  for 
  a 
  con- 
  

   siderable 
  distance. 
  The 
  lowest 
  red 
  shales 
  and 
  sandstones 
  which 
  

   have 
  been 
  used 
  by 
  some 
  writers 
  for 
  the 
  line 
  of 
  division 
  between 
  

  

  