﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  95 
  

  

  2 
  Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  (aa) 
  

  

  var. 
  posterns 
  Hall 
  & 
  Clarke 
  

   Small 
  and 
  very 
  inucronate. 
  Apparently 
  this 
  species. 
  Some 
  

   of 
  these 
  specimens 
  were 
  examined 
  by 
  Dr 
  Clarke 
  who 
  

   wrote 
  of 
  them 
  as 
  follows: 
  "These 
  specimens 
  are 
  more 
  

   progressed 
  towards 
  Sp. 
  mesacostalis 
  [than 
  the 
  Ithaca 
  

   fauna 
  Sp. 
  mucronatus 
  Y&v.posterus]; 
  the 
  internal 
  septum 
  is 
  

   more 
  pronounced 
  and 
  the 
  median 
  costa 
  stronger. 
  They 
  

   impress 
  one 
  as 
  distinctly 
  more 
  progressed 
  toward 
  the 
  

   mesacostalis 
  extreme. 
  I 
  have 
  called 
  them 
  posterns; 
  perhaps 
  

   it 
  would 
  be 
  nearer 
  the 
  truth 
  if 
  one 
  should 
  designate 
  them 
  

   as 
  posterus+or 
  mesacostalis 
  — 
  . 
  I 
  would 
  not 
  call 
  them 
  

   mesacostalis 
  for 
  the 
  concept 
  which 
  that 
  term 
  embodies 
  is 
  

   a 
  mucronatus 
  with 
  a 
  well 
  developed 
  median 
  costa 
  and 
  in- 
  

   ternal 
  septum." 
  

  

  3 
  Cyrtina 
  hamiltonensis 
  Hall 
  (it) 
  

  

  4 
  Schizophoria 
  impressa 
  (Hall) 
  H. 
  & 
  C. 
  

  

  = 
  8. 
  striatula 
  (Schl.) 
  Schuchert 
  (r) 
  

  

  5 
  Productella 
  lachrymosa 
  (Con.) 
  Hall 
  . 
  (c) 
  

  

  6 
  Liorliynchus 
  globuliformis 
  (Van.) 
  Hall 
  (aa) 
  

  

  The 
  specimens 
  are 
  flattened 
  in 
  the 
  shale 
  but 
  I 
  think 
  they 
  

   are 
  the 
  above 
  species 
  rather 
  than 
  L. 
  mesacostalis 
  Hall. 
  

  

  7 
  Cryptonella 
  eudora 
  Hall 
  (?) 
  (rr) 
  

  

  8 
  Leptodesma 
  sp. 
  (rr) 
  

  

  9 
  Palaeoneilo 
  brevis 
  Hall 
  (?) 
  (rr) 
  

  

  10 
  Tentaculites 
  spiculus 
  Hall 
  (?) 
  (a) 
  

  

  11 
  Crinoid 
  segments 
  and 
  stems 
  (c) 
  

  

  These 
  rocks 
  are, 
  clearly, 
  stratigraphically 
  above 
  the 
  Oneonta 
  

   formation 
  and 
  correspond 
  with 
  those 
  of 
  Greene 
  township 
  along 
  

   ithe 
  Chenango 
  valley 
  and 
  as 
  the 
  writer 
  stated 
  in 
  the 
  early 
  part 
  

   nf 
  this 
  report 
  they 
  may 
  be 
  regarded 
  as 
  representing 
  the 
  lower 
  

   part 
  of 
  the 
  Chemung 
  formation.^ 
  However 
  before 
  this 
  question 
  

   can 
  be 
  settled 
  authoritatively 
  the 
  rocks 
  should 
  be 
  carefully 
  studied 
  

   and 
  followed 
  across 
  the 
  country 
  from 
  the 
  Chenango 
  valley 
  to 
  the 
  

   southern 
  part 
  of 
  Tompkins 
  county. 
  This 
  fauna 
  was 
  called 
  the 
  

   Liorhynchus 
  globuliformis 
  stage 
  by 
  Prof. 
  H. 
  S. 
  Williams 
  who 
  

   studied 
  specimens 
  from 
  this 
  glen 
  and 
  considered 
  them 
  to 
  repre- 
  

  

  Gl5th 
  an. 
  rep't 
  N. 
  Y. 
  state 
  geologist, 
  P. 
  165. 
  

  

  