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  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Sherburne 
  formation 
  of 
  eastern 
  New 
  York 
  as 
  synchronous 
  with* 
  

   the 
  lower 
  part 
  of 
  the 
  Portage 
  of 
  western 
  New 
  York. 
  

  

  XXVIII 
  D 
  2 
  . 
  In 
  the 
  ledges 
  by 
  the 
  side 
  of 
  the 
  highway 
  leading 
  up 
  

   Mill 
  creek 
  only 
  a 
  short 
  distance 
  above 
  the 
  bridge, 
  are 
  thin 
  sand- 
  

   stones 
  alternating 
  with 
  blue, 
  arenaceous 
  shales, 
  in 
  both 
  of 
  which 
  

   are 
  numerous 
  specimens 
  of 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  as- 
  

   sociated 
  with 
  a 
  smaller 
  number 
  of 
  specimens 
  of 
  other 
  species. 
  

   The 
  complete 
  list 
  is: 
  

  

  1 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (a) 
  

  

  2 
  Chonetes 
  coronata 
  (Con.) 
  Hall 
  (?) 
  (rr) 
  

  

  3 
  Anxbocoelia 
  umbonata 
  (Con.) 
  Hall 
  (rr) 
  

  

  4 
  Camarotoechia 
  congregata 
  (Con.) 
  H. 
  & 
  C. 
  (c) 
  

  

  One 
  specimen 
  resembles 
  somewhat 
  C. 
  stevensi 
  (Hall) 
  H. 
  

   & 
  C. 
  

  

  5 
  Cephalopod 
  (rr) 
  

  

  Fragment 
  of 
  shell. 
  

  

  The 
  above 
  fossiliferous 
  zone 
  is 
  25 
  feet 
  above 
  the 
  base 
  of 
  the 
  

   Westkill 
  gorge 
  and 
  shows 
  the 
  transitional 
  nature 
  of 
  the 
  beds 
  

   in 
  the 
  lower 
  part 
  of 
  this 
  section. 
  

  

  XXVIII 
  D 
  3 
  . 
  In 
  ascending 
  the 
  eastern 
  point 
  of 
  the 
  hill 
  for 
  215 
  

   feet 
  above 
  the 
  shales 
  by 
  the 
  highway 
  the 
  rocks 
  are 
  largely 
  covered. 
  

   At 
  an 
  elevation 
  of 
  270 
  feet 
  above 
  the 
  river 
  level, 
  however, 
  are 
  

   plenty 
  of 
  loose, 
  angular 
  shales 
  which 
  evidently 
  came 
  from 
  a 
  ledge 
  

   at 
  about 
  that 
  horizon. 
  These 
  shales 
  are 
  quite 
  fossiliferous 
  con- 
  

   taining 
  a 
  large 
  number 
  of 
  specimens 
  of 
  Camarotoechia 
  stevensi 
  

   (Hall) 
  H. 
  & 
  C. 
  and 
  an 
  occasional 
  one 
  of 
  Spirifer 
  mesastrialis 
  Hall. 
  

   These 
  fossils 
  show 
  that 
  at 
  this 
  horizon 
  the 
  rocks 
  of 
  the 
  Ithaca 
  

   group 
  are 
  reached. 
  The 
  complete 
  fauna 
  is: 
  

  

  1 
  Camarotoechia 
  stevensi 
  (Hall) 
  H. 
  & 
  C. 
  (aa) 
  

  

  Very 
  abundant 
  in 
  a 
  thin 
  rotten 
  sandstone. 
  

  

  2 
  Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  (?) 
  ■ 
  (rr) 
  

  

  3 
  8. 
  mesastrialis 
  Hall 
  (rr) 
  

  

  The 
  fine 
  striae 
  are 
  only 
  faintly 
  shown. 
  

  

  4 
  Sphenotus 
  cuneatus 
  (Con.) 
  Hall 
  ' 
  (a) 
  

  

  5 
  Goniophora 
  carinata 
  (Con.) 
  Hall 
  (rr) 
  

  

  6 
  Modiomorpha 
  sp. 
  (r) 
  

  

  