﻿350 
  Forty- 
  seventh 
  Report 
  on 
  tee 
  State 
  Museum. 
  

  

  acteristic 
  Oriskany 
  sandstone 
  species, 
  though 
  there 
  is 
  a 
  large 
  

   orthoid 
  suggestive 
  of 
  Hipparionyx 
  proximus, 
  a 
  large 
  Stropheo- 
  

   donta 
  and 
  a 
  large 
  Spirifer 
  which 
  may 
  prove 
  to 
  be 
  S. 
  arenosus. 
  

   These 
  are 
  all 
  unlike 
  forms 
  occurring 
  in 
  Upper 
  Helderberg 
  faunas 
  

   and, 
  as 
  far 
  as 
  the 
  fragments 
  show, 
  have 
  an 
  Oriskany 
  sandstone 
  

   aspect. 
  On 
  the 
  other 
  hand, 
  the 
  presence 
  of 
  the 
  Pentamerella 
  

   referred 
  to, 
  of 
  Pentagonia 
  unisulcata 
  and 
  an 
  Orthis 
  comparable 
  

   to 
  0. 
  propinqua, 
  indicate 
  a 
  positive 
  Upper 
  Helderberg 
  element 
  

   in 
  the 
  fauna 
  ; 
  and 
  it 
  has 
  hence 
  been 
  suggested 
  that 
  this 
  four 
  feet 
  

   of 
  sandstone 
  represents 
  a 
  commingling 
  of 
  the 
  faunas 
  of 
  the 
  

   Oriskany 
  sandstone 
  and 
  Schoharie 
  grit, 
  a 
  repetition 
  on 
  a 
  small 
  

   scale 
  of 
  the 
  concurrence 
  of 
  the 
  two 
  faunas 
  observed 
  in 
  the 
  

   province 
  of 
  Ontario. 
  

  

  The 
  separation 
  of 
  this 
  stratum 
  from 
  the 
  overlying 
  upper 
  

   Helderberg 
  limestones 
  is 
  sharp, 
  the 
  delimitation 
  of 
  these 
  lime- 
  

   stones 
  being 
  very 
  clear 
  both 
  above 
  and 
  below. 
  With 
  its 
  base 
  at 
  

   100 
  L 
  feet 
  and 
  its 
  upper 
  limit 
  at 
  866-J- 
  feet 
  it 
  has 
  a 
  total 
  thickness 
  of 
  

   134 
  i 
  feet, 
  of 
  which 
  but 
  two 
  and 
  a 
  half 
  feet 
  at 
  the 
  base 
  can 
  be 
  

   referred 
  to 
  the 
  Onondaga 
  limestone. 
  The 
  132 
  feet 
  of 
  Cornif 
  erous 
  

   limestones 
  is 
  free 
  of 
  soft 
  shale 
  and 
  not 
  especially 
  abundant 
  in 
  

   fossils. 
  The 
  most 
  striking 
  character 
  of 
  the 
  limestones 
  through- 
  

   out 
  their 
  extent 
  is 
  the 
  remarkable 
  paucity 
  of 
  corals 
  ; 
  all 
  the 
  more 
  

   surprising 
  from 
  their 
  amazing 
  abundance 
  in 
  these 
  limestones 
  a 
  

   little 
  further 
  to 
  the 
  west, 
  in 
  Oenesee 
  county, 
  aJbout 
  LeEoy. 
  

  

  The 
  succession 
  of 
  faunas 
  in 
  the 
  Marcellus 
  group 
  is 
  most 
  interest- 
  

   ing 
  and 
  instructive. 
  Above 
  the 
  topmost 
  layer 
  of 
  Upper 
  Helder- 
  

   berg 
  limestone 
  is 
  a 
  thin 
  stratum 
  composed 
  of 
  washed 
  crinoidal 
  

   fragments 
  (SQ6 
  feet) 
  and 
  immediately 
  above 
  appear 
  bituminous 
  

   shales 
  with 
  large 
  Panenkas, 
  Liorhynchus 
  UmAtaris 
  and 
  Styliolina 
  

   ■fissureUa. 
  At 
  856 
  and 
  852 
  feet 
  are 
  two 
  layers 
  of 
  an 
  impure 
  

   argillaceous 
  limestone, 
  quite 
  alike 
  in 
  lithological 
  characters 
  and 
  

   largely 
  composed 
  of 
  Tentaculites 
  gracilistriatus. 
  These 
  two 
  

   layers, 
  the 
  upper 
  about 
  twice 
  the 
  thickness 
  of 
  the 
  lower, 
  are 
  

   separated 
  by 
  a 
  two-foot 
  bed 
  of 
  a 
  purer 
  limestone 
  of 
  a 
  different 
  

   aspect. 
  The 
  fauna 
  of 
  this 
  layer 
  is 
  comparatively 
  prolific 
  and 
  the 
  

   list 
  of 
  species 
  given 
  in 
  the 
  section 
  is 
  worthy 
  of 
  close 
  inspection. 
  

   The 
  fossils 
  are 
  not 
  those 
  characteristic 
  of 
  the 
  Marcellus 
  shales, 
  

   properly 
  speaking, 
  but 
  we 
  meet 
  here 
  for 
  the 
  first 
  time 
  many 
  of 
  

  

  