﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  75 
  

  

  referred 
  to 
  the 
  formation 
  in 
  several 
  places 
  in 
  his 
  final 
  report, 
  but 
  

   without 
  mentioning 
  Conrad's 
  name, 
  and 
  in 
  describing 
  this 
  hill 
  

   referred 
  the 
  rocks 
  at 
  its 
  base, 
  correctly, 
  to 
  the 
  Ithaca 
  group. 
  He 
  

   states 
  that 
  the 
  rocks 
  of 
  the 
  Catskill 
  group 
  or 
  Oneonta 
  sandstones 
  

   of 
  Vanuxem 
  " 
  occupy 
  the 
  highest 
  part 
  of 
  the 
  face 
  of 
  the 
  hill, 
  

   the 
  base 
  of 
  which 
  is 
  composed 
  of 
  rocks 
  which 
  I 
  [Vanuxem] 
  have 
  

   supposed 
  to 
  belong 
  to 
  the 
  Ithaca 
  group."® 
  Again, 
  the 
  term 
  

   Oneonta 
  as 
  the 
  name 
  for 
  a 
  geological 
  formation 
  was 
  already 
  in 
  

   use, 
  for 
  Vanuxem 
  in 
  1840 
  proposed 
  the 
  name 
  " 
  Montrose 
  sandstone 
  

   or 
  sandstone 
  of 
  Oneonta 
  " 
  6 
  for 
  the 
  massive 
  gray 
  and 
  red 
  sand- 
  

   stones 
  and 
  shales 
  that 
  cover 
  the 
  high 
  ground 
  in 
  the 
  vicinity 
  of 
  

   Oneonta. 
  Later 
  studies 
  have 
  proved 
  that 
  the 
  rocks 
  in 
  the 
  

   vicinity 
  of 
  Montrose, 
  Pa., 
  belong 
  in 
  a 
  later 
  formation 
  — 
  the 
  Cats- 
  

   kill 
  — 
  than 
  the 
  higher 
  sandstones 
  about 
  Oneonta, 
  consequently 
  

   the 
  name 
  Oneonta 
  sandstone 
  has 
  been 
  retained 
  for 
  this 
  forma- 
  

   tion. 
  Some 
  years 
  ago 
  the 
  writer 
  called 
  attention 
  to 
  this 
  double 
  

   use 
  of 
  Oneonta 
  for 
  a 
  formation 
  name 
  and 
  explained 
  their 
  differ- 
  

   ence 
  in 
  stratigraphic 
  position 
  . 
  

  

  XXIII 
  D 
  4 
  . 
  Above 
  Chestnut 
  st. 
  and 
  about 
  29 
  feet 
  above 
  the 
  

   top 
  of 
  the 
  White 
  quarry 
  are 
  fine, 
  blue 
  argillaceous 
  shales 
  which 
  

   weather 
  to 
  a 
  greenish 
  color 
  and 
  break 
  into 
  very 
  fine 
  pieces. 
  About 
  

   11 
  feet 
  of 
  these 
  shales 
  were 
  formerly 
  exposed 
  but 
  recent 
  building 
  

   has 
  greatly 
  obscured 
  the 
  outcrop. 
  These 
  shales 
  are 
  somewhat 
  

   fossiliferous 
  although 
  but 
  few 
  species 
  were 
  ever 
  collected 
  in 
  this 
  

   zone. 
  The 
  list 
  is 
  as 
  follows: 
  

  

  1 
  Tropidoleptus 
  carmatus 
  (Con.) 
  Hall 
  (rr) 
  

  

  2 
  Splrifer 
  mesastrialis 
  Hall 
  (c) 
  

  

  3 
  GamarotoecMa 
  eximia 
  (Hall) 
  H. 
  & 
  C. 
  (r) 
  

  

  4 
  Strophalosia 
  sp. 
  * 
  (rr) 
  

  

  5 
  Chonetes 
  sp. 
  (rr) 
  

  

  6 
  Nucula 
  oellistriata 
  (Con.) 
  Hall 
  var. 
  (c) 
  

  

  7 
  Pafacyclas 
  Urata 
  (Con.) 
  Hall 
  (rr) 
  

  

  8 
  Crinoid 
  segments 
  (rr) 
  

  

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

  

  &4th 
  an. 
  rep't 
  third 
  district 
  (assembly 
  document 
  no. 
  50, 
  1840) 
  p. 
  381. 
  

  

  c 
  Proc. 
  American 
  ass'n 
  adv. 
  science, 
  1887. 
  36 
  : 
  210. 
  

  

  