﻿80 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  In 
  1841 
  Conrad 
  named 
  them 
  the 
  Oneonta 
  group,® 
  while 
  in 
  the 
  

   following 
  year 
  Vanuxem 
  referred 
  them 
  correctly 
  to 
  the 
  Ithaca 
  

   group. 
  6 
  In 
  1885 
  Prof. 
  Hall 
  published 
  the 
  following 
  classification 
  

   for 
  the 
  Devonian 
  system 
  of 
  Otsego, 
  Delaware 
  and 
  Chenango 
  

   counties 
  : 
  

  

  'Catskill 
  group 
  

  

  Chemung 
  group 
  

  

  j 
  Portage 
  group 
  

   Oneonta 
  -j 
  _ 
  ... 
  . 
  . 
  

  

  ( 
  Hamilton 
  (upper) 
  

  

  Hamilton 
  group 
  

  

  Corniferous 
  limestone 
  

  

  Oriskany 
  sandstone.' 
  

  

  The 
  author 
  states 
  that 
  the 
  Oneonta 
  sandstone 
  " 
  comes 
  in 
  at 
  

   about 
  the 
  close 
  of 
  the 
  Hamilton 
  period, 
  or 
  more 
  properly 
  may 
  be 
  

   regarded 
  as 
  the 
  result 
  of 
  changes 
  which 
  terminated 
  the 
  conditions 
  

   of 
  the 
  Hamilton 
  group." 
  d 
  In 
  the 
  list 
  of 
  localities 
  following 
  the 
  

   description 
  of 
  species, 
  Goniophora 
  carinata 
  (Con.) 
  Hall 
  from 
  

   Oneonta, 
  e 
  Nuculites 
  cuneiformis 
  Con., 
  at 
  Oneonta/ 
  and 
  Phthonia 
  

   nodioostata 
  Hall 
  near 
  Oneonta 
  9 
  are 
  referred 
  to 
  the 
  Hamilton 
  

   group. 
  

  

  In 
  1886 
  Prof. 
  H. 
  S. 
  Williams 
  showed 
  that 
  the 
  fossiliferous 
  rocks 
  

   at 
  Oneonta 
  belong 
  stratigraphically- 
  above 
  the 
  horizon 
  of 
  the 
  

   Genesee 
  shale 
  and 
  he 
  called 
  them 
  the 
  Paracyclas 
  lirata 
  stage.* 
  

  

  Prosser 
  in 
  1887 
  showed 
  that 
  between 
  the 
  fossiliferous 
  rocks 
  of 
  

   Oneonta 
  and 
  the 
  top 
  of 
  the 
  Hamilton 
  formation 
  are 
  the 
  Sherburne 
  

   flagstones 
  of 
  Vanuxem.* 
  

  

  a 
  5th 
  an. 
  rep't 
  paleontology 
  of 
  N. 
  Y. 
  (assembly 
  doc. 
  no. 
  150, 
  1841) 
  p. 
  31. 
  

   b 
  Geology 
  of 
  New 
  York. 
  1842. 
  pt 
  3, 
  p. 
  192. 
  

  

  c 
  Geol. 
  surv., 
  N. 
  Y. 
  Paleontology, 
  5, 
  pt 
  1, 
  Lamellibranchiata 
  2:518. 
  

   d 
  Ibid, 
  p. 
  517. 
  

   e 
  Ibid, 
  p. 
  302. 
  

   /Ibid, 
  p. 
  826. 
  

   g 
  Ibid, 
  p. 
  474. 
  

  

  ftProc. 
  American 
  ass'n 
  adv. 
  science, 
  34:225, 
  233 
  and 
  see 
  §10 
  of 
  the 
  chart 
  of 
  Meridional 
  sections 
  of 
  

   the 
  Upper 
  Devonian 
  deposits 
  of 
  New 
  York, 
  Pennsylvania 
  and 
  Ohio. 
  

   i 
  Proc. 
  American 
  ass'n 
  adv. 
  science, 
  34 
  : 
  210. 
  

  

  