﻿746 
  I 
  ORTY- 
  SEVENTH 
  REPORT 
  ON 
  THE 
  STATE 
  MUSEUM. 
  

  

  Atrypa 
  reticularis, 
  finely 
  striated 
  form. 
  

   Orthoceras 
  sp. 
  ? 
  

  

  Tentaculites 
  bellulus, 
  common. 
  

  

  T. 
  sp. 
  undes. 
  ; 
  almost 
  without 
  ambulations, 
  very 
  fine 
  concen- 
  

   tric 
  strise. 
  

   Hyolithes 
  sp. 
  ? 
  

  

  Liopteria 
  DeJTayi, 
  large, 
  normal 
  form 
  ; 
  abundant. 
  

   Microdon 
  gregarius 
  (or 
  bellistriatus) 
  ; 
  abounds 
  on 
  thin 
  slabs. 
  

   Actinopteria^eta, 
  rare. 
  

   A. 
  perstrialis, 
  rare. 
  

  

  Schizodus 
  appressus, 
  more 
  orbicular 
  than 
  usual. 
  

   Modiella 
  pygmcea, 
  rare. 
  

   PalcBoneilo 
  brevis. 
  

   Sphenotus 
  contractus. 
  

   Grammy 
  sia 
  elliptica, 
  common. 
  

   Scales 
  of 
  Holoptychius 
  or 
  Bothriolepis. 
  

  

  Resume. 
  

  

  The 
  description 
  of 
  a 
  number 
  of 
  sections, 
  for 
  the 
  most 
  part 
  

   isolated, 
  leaves 
  the 
  mind 
  somewhat 
  beclouded 
  as 
  to 
  their 
  interre- 
  

   lations. 
  To 
  return 
  then 
  to 
  the 
  point 
  of 
  departure, 
  the 
  first 
  

   series 
  of 
  sections 
  here 
  described, 
  beginning 
  at 
  the 
  Chenango 
  

   river 
  at 
  Norwich 
  and 
  rising 
  to 
  the 
  summit 
  of 
  the 
  high 
  hill 
  at 
  the 
  

   west, 
  shows 
  very 
  clearly 
  that 
  the 
  Oneonta 
  sandstones, 
  red 
  and 
  

   green 
  shales 
  are 
  underlaid 
  by 
  sandy 
  shales, 
  flags 
  and 
  sandstones, 
  

   the 
  last 
  two 
  predominating, 
  and 
  fossils 
  becoming 
  exceedingly 
  

   sparse 
  toward 
  the 
  top, 
  the 
  more 
  shaly 
  portions 
  beneath 
  being 
  

   frequently 
  highly 
  fossiliferous. 
  Do 
  these 
  fossiiiferous 
  sandy 
  

   shales 
  bearing 
  predominant 
  Hamilton 
  species, 
  some 
  of 
  them 
  

   slightly 
  modified 
  in 
  form 
  from 
  their 
  usual 
  appearance 
  in 
  the 
  

   Hamilton 
  fauna, 
  but 
  associated 
  with 
  Spirifer 
  mesastrialis 
  and 
  

   Actinopteria 
  zeta, 
  eta 
  and 
  pirstrialis 
  / 
  does 
  this 
  mesastrialis- 
  

   fauna 
  lie 
  above 
  the 
  horizon 
  of 
  the 
  Genesee 
  shales? 
  This 
  is 
  the 
  

   critical 
  question, 
  the 
  answer 
  to 
  which 
  must 
  determine 
  the 
  geo- 
  

   logical 
  position 
  and 
  equivalence 
  of 
  the 
  Oneonta 
  sands 
  and 
  shales. 
  

  

  The 
  easternmost 
  recorded 
  exposure 
  of 
  the 
  Genesee 
  shales 
  in 
  

   New 
  York 
  is 
  near 
  Smyrna, 
  a 
  village 
  on 
  the 
  west 
  side 
  of 
  the 
  

   Chenango 
  valley 
  about 
  twelve 
  miles 
  north 
  of 
  Norwich. 
  Closer 
  

   to 
  the 
  river 
  the 
  formation 
  seems 
  to 
  have 
  disappeared 
  entirely, 
  

  

  