﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  161 
  

  

  G 
  M. 
  (Cypricardella) 
  complanatus 
  Hall 
  (rr) 
  

  

  7 
  Modiomorpha 
  mytiloides 
  (Con.) 
  Hall 
  (?) 
  (rr) 
  

  

  8 
  Palaeoneilo 
  emarginata 
  (Con.) 
  Hall 
  var. 
  (r) 
  

  

  9 
  Nucula 
  bellistriata 
  (Con.) 
  Hall 
  (?) 
  W 
  

  

  10 
  N. 
  corbuliformis 
  (Con.) 
  Hall 
  (?) 
  (rr) 
  

  

  11 
  Gomophora 
  cf. 
  hamilt.onensis 
  (Hall) 
  Miller 
  (rr) 
  

  

  12 
  Leptodesma 
  rogersi 
  Hall 
  (?) 
  ( 
  r 
  ) 
  

  

  13 
  Actinopteria 
  boydi 
  (Con.) 
  Hall 
  ( 
  r 
  ) 
  

  

  14 
  Ten-taculites 
  attenuatus 
  Hall 
  (?) 
  ( 
  c 
  ) 
  

  

  These 
  fossils 
  are 
  believed 
  to 
  occur 
  between 
  350 
  and 
  400 
  feet 
  

   above 
  coarse, 
  greenish 
  gray 
  sandstones 
  which 
  cap 
  the 
  hill 
  be- 
  

   tween 
  the 
  Westkill 
  and 
  Mill 
  creek 
  to 
  the 
  west 
  of 
  North 
  Blenheim 
  

   in 
  the 
  Schoharie 
  valley. 
  The 
  explanation 
  is 
  that 
  the 
  coarse 
  

   sandstones 
  with 
  the 
  facies 
  of 
  the 
  Oneonta 
  sandstone 
  appear 
  lower 
  

   in 
  the 
  Schoharie 
  valley 
  than 
  in 
  the 
  Charlotte 
  and 
  Susquehanna 
  

   valleys. 
  This 
  replacement 
  of 
  the 
  Ithaca 
  formation 
  by 
  coarse, 
  

   greenish 
  gray 
  and 
  red 
  sandstones 
  in 
  lithologic 
  characters 
  similar 
  

   to 
  those 
  of 
  the 
  Oneonta 
  sandstone 
  is 
  well 
  shown 
  along 
  the 
  Scho- 
  

   harie 
  valley 
  and 
  to 
  the 
  eastward. 
  

  

  Mather 
  in 
  his 
  report 
  on 
  the 
  first 
  geological 
  district 
  mentioned 
  

   this 
  locality 
  north 
  of 
  Jefferson 
  Academy, 
  as 
  Jefferson 
  was 
  then 
  

   called. 
  He 
  wrote, 
  " 
  shells 
  were 
  seen 
  in 
  many 
  places 
  in 
  the 
  grits 
  

   and 
  gritty 
  shales, 
  between 
  Summit 
  and 
  Jefferson 
  Academy, 
  

   especially 
  on 
  the 
  high 
  grounds 
  and 
  on 
  the 
  tops 
  of 
  the 
  hills. 
  They 
  

   are 
  particularly 
  abundant" 
  about 
  one 
  mile 
  north 
  of 
  Jefferson 
  

   Academy." 
  a 
  He 
  simply 
  mentioned 
  them 
  under 
  the 
  Erie 
  division 
  

   of 
  the 
  rocks, 
  which 
  in 
  his 
  district 
  included 
  the 
  Marcellus, 
  Hamil- 
  

   ton, 
  Ithaca 
  and 
  Chemung 
  groups 
  without 
  referring 
  them 
  to 
  any 
  

   formation. 
  On 
  the 
  Geological 
  map 
  of 
  New 
  York 
  published 
  in 
  1844, 
  

   all 
  of 
  Jefferson 
  township, 
  except 
  the 
  extreme 
  northern 
  portion, 
  

   is 
  colored 
  as 
  in 
  the 
  Catskill 
  formation. 
  This 
  would 
  make 
  the 
  

   heavy 
  greenish 
  sandstones 
  near 
  Morseville 
  the 
  base 
  of 
  the 
  for- 
  

   mation. 
  The 
  northern 
  edge 
  of 
  Jefferson 
  and 
  the 
  southern 
  two 
  

   thirds 
  of 
  Summit 
  are 
  colored 
  as 
  in 
  the 
  Portage 
  and 
  Chemung 
  

  

  a 
  Geology 
  of 
  New 
  York. 
  1844. 
  Pt 
  1, 
  p. 
  321. 
  

  

  