﻿202 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Manorkill 
  (this 
  is 
  supposed 
  to 
  be 
  the 
  falls 
  generally 
  called 
  the- 
  

   Minekill). 
  

  

  XXVIII 
  H 
  4 
  . 
  On 
  top 
  of 
  the 
  smooth, 
  argillaceous 
  shales 
  of 
  H 
  3 
  is 
  a 
  

   layer 
  with 
  pebbles 
  making 
  a 
  sort 
  of 
  conglomerate 
  in 
  which 
  

   fossils 
  are 
  common. 
  Succeeding 
  this 
  layer 
  are 
  bluish, 
  argil- 
  

   laceous 
  shales 
  which 
  also 
  contain 
  numerous 
  fossils. 
  Some 
  of 
  

   the 
  layers 
  in 
  the 
  shale 
  are 
  somewhat 
  calcareous, 
  containing 
  

   abundant 
  specimens 
  of 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall, 
  and 
  

   form 
  a 
  sort 
  of 
  fire-stone. 
  These 
  shales 
  constitute 
  one 
  of 
  the 
  

   most 
  fossiliferous 
  zones 
  found 
  in 
  the 
  Ithaca 
  formation 
  and 
  it 
  

   is 
  an 
  excellent 
  locality, 
  for 
  collecting. 
  It 
  will 
  be 
  farther 
  seen 
  

   on 
  referring 
  to 
  the 
  list 
  of 
  42 
  species 
  recorded 
  from 
  this 
  zone 
  that 
  

   it 
  is 
  practically 
  Hamilton 
  and 
  furnishes 
  an 
  interesting 
  example 
  

   of 
  the 
  recurrence 
  of 
  this 
  fauna. 
  Spirifer 
  mesastrialis 
  Hall 
  was 
  

   not 
  noticed 
  in 
  this 
  zone, 
  but 
  in 
  section 
  XXVIII 
  D 
  this 
  species 
  was 
  

   found 
  some 
  235 
  feet 
  lower 
  and 
  also 
  higher. 
  The 
  fauna 
  is 
  interest- 
  

   ing 
  and 
  richer 
  than 
  that 
  fdund 
  at 
  any 
  other 
  locality. 
  

  

  1 
  Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  (a) 
  

  

  2 
  8. 
  tullius 
  Hall 
  (c> 
  

  

  3 
  S. 
  granulosus 
  (Con.) 
  H. 
  & 
  C. 
  (r) 
  

  

  4 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (a) 
  

  

  5 
  Athyris 
  spiriferoides 
  (Eaton) 
  Hall 
  (c) 
  

  

  6 
  Ghonetes 
  setigera 
  Hall 
  (a) 
  

  

  7 
  G. 
  coronata 
  (Con.) 
  Hall 
  (r) 
  

  

  8 
  Gryptonella 
  (Eunella) 
  lincklaeni 
  Hall 
  (r) 
  

  

  9 
  Palaeoneilo 
  maxima 
  (Con.) 
  Hall 
  (c) 
  

  

  10 
  P. 
  emarginata 
  (Con.) 
  Hall 
  (rr) 
  

  

  11 
  Pholadella 
  radiata 
  (Con.) 
  Hall 
  (c) 
  

  

  12 
  Nucula 
  bellistriata 
  (Con.) 
  Hall 
  (rr) 
  

  

  13 
  Glyptodesma 
  erectum 
  (Con.) 
  Hall 
  (c) 
  

  

  14 
  Orthonota 
  undulata 
  Con. 
  (r) 
  

  

  15 
  Modiomorpha 
  concentrica 
  (Con.) 
  Hall 
  (rr) 
  

  

  16 
  M. 
  mytiloides 
  (Con.) 
  Hall 
  (rr) 
  

  

  17 
  M. 
  suoalata 
  (Con.) 
  Hall 
  

  

  var. 
  chemungensis 
  Hall 
  (rr) 
  

  

  aProc. 
  Amer. 
  philosophical 
  society, 
  17:347-48. 
  

  

  