﻿200 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  12 
  Leptodesma 
  cf. 
  rogersi 
  Hall 
  (c) 
  

  

  The 
  specimens 
  being 
  poorly 
  preserved 
  do 
  not 
  show 
  the 
  spine 
  

   and 
  do 
  not 
  seem 
  to 
  be 
  quite 
  so 
  oblique 
  on 
  the 
  umbonal 
  

   ridge. 
  

  

  n 
  

  

  13 
  (?) 
  Schizodus 
  sp. 
  (rr) 
  

  

  Badly 
  broken. 
  

  

  14 
  IAopteria 
  dekayi 
  Hall 
  (rr) 
  

  

  15 
  Orbiculoidea 
  sp. 
  (rr) 
  

  

  Broken 
  and 
  poorly 
  preserved. 
  

  

  On 
  the 
  supposition 
  that 
  this 
  zone 
  and 
  that 
  of 
  XXVIII 
  X 
  6 
  on 
  the 
  

   hill 
  south 
  of 
  West 
  Fulton 
  are 
  at 
  about 
  the 
  same 
  horizon, 
  near 
  the 
  

   base 
  of 
  the 
  Ithaca 
  formation, 
  a 
  calculation 
  was 
  made 
  which 
  gave 
  

   a 
  dip 
  of 
  174 
  feet 
  a 
  mile 
  to 
  the 
  south 
  southwest. 
  Again 
  the 
  same 
  

   calculation 
  was 
  made 
  between 
  this 
  zone 
  and 
  that 
  of 
  XXVIII 
  C 
  8 
  

   on 
  the 
  hill 
  east 
  of 
  Summit 
  which 
  gave 
  a 
  dip 
  of 
  129 
  feet 
  a 
  mile 
  

   to 
  the 
  southeast. 
  

  

  It 
  will 
  be 
  noticed 
  that 
  this 
  dip 
  of 
  129 
  feet 
  a 
  mile 
  agrees 
  very 
  

   closely 
  with 
  that 
  obtained 
  for 
  the 
  sandstone 
  of 
  the 
  Eminence 
  

   hill 
  and 
  D 
  5 
  of 
  this 
  section 
  which 
  is 
  122 
  feet. 
  The 
  general 
  agree- 
  

   ment 
  of 
  these 
  several 
  localities 
  seems 
  to 
  demonstrate 
  that 
  this 
  

   portion 
  of 
  Schoharie 
  co. 
  has 
  a 
  considerable 
  southeast 
  dip. 
  

  

  XXVIII 
  D 
  4 
  . 
  A 
  ledge 
  of 
  rather 
  thin 
  shales 
  in 
  which 
  fossils 
  are 
  

   abundant 
  occurs 
  640 
  feet 
  above 
  the 
  level 
  of 
  the 
  river. 
  Spirifer 
  

   mesastrialis 
  Hall 
  and 
  other 
  species 
  of 
  the 
  Ithaca 
  formation 
  were 
  

   found 
  and 
  the 
  entire 
  list 
  is 
  as 
  follows 
  :, 
  

  

  1 
  Sphenotus 
  cuneatus 
  (Con.) 
  Hall 
  (c) 
  

  

  2 
  Orthonota 
  undulata 
  Con. 
  (rr) 
  

  

  3 
  Schizodus 
  appressus 
  (Con.) 
  Hall 
  (?) 
  (c) 
  

  

  Rather 
  smaller 
  though 
  near 
  the 
  form 
  of 
  this 
  species. 
  

  

  4 
  Orammysia 
  (Splienomya) 
  cuneata 
  Hall 
  (rr) 
  

  

  5 
  Leptodesma 
  rogersi 
  Hall 
  (c) 
  

  

  6 
  IAopteria 
  dekayi 
  Hall 
  (r) 
  

  

  7 
  L. 
  sp. 
  (r) 
  

  

  Fine 
  concentric 
  striae. 
  

  

  8 
  Spirifer 
  mesastrialis 
  Hall 
  (r) 
  

  

  9 
  Liorhynchus 
  mesacostalis 
  Hall 
  (?) 
  (rr) 
  

  

  10 
  Orbiculoidea 
  sp. 
  (rr) 
  

  

  11 
  Tentaculites 
  sp. 
  (r) 
  

  

  