﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  197 
  

  

  at 
  North 
  Blenheim, 
  while 
  the 
  coarse 
  sandstone 
  D 
  5 
  west 
  of 
  North 
  

   Blenheim 
  is 
  650 
  feet 
  above 
  the 
  river 
  level. 
  If 
  these 
  two 
  zones 
  

   represent 
  about 
  the 
  same 
  horizon 
  then 
  there 
  is 
  a 
  dip 
  of 
  approxi- 
  

   mately 
  122 
  feet 
  a 
  mile 
  to 
  the 
  southeast. 
  

  

  XXVIII 
  D 
  1 
  . 
  To 
  the 
  west 
  of 
  North 
  Blenheim 
  is 
  a 
  steep 
  hill 
  be- 
  

   tween 
  the 
  Westkill 
  and 
  Mill 
  creek. 
  The 
  rocks 
  exposed 
  in 
  the 
  

   gorge 
  at 
  the 
  lower 
  end 
  of 
  the 
  Westkill 
  and 
  in 
  the 
  eastern 
  end 
  of 
  

   this 
  hill 
  form 
  an 
  interesting 
  section, 
  passing 
  from 
  the 
  Hamilton 
  

   formation 
  at 
  the 
  base 
  to 
  the 
  coarse 
  grained, 
  greenish 
  sandstones 
  

   near 
  the 
  top 
  similar 
  to 
  the 
  Oneonta. 
  In 
  the 
  Schoharie 
  river 
  at 
  

   North 
  Blenheim 
  are 
  coarse, 
  grayish 
  sandstones 
  which 
  do 
  not 
  

   closely 
  resemble 
  the 
  Hamilton 
  although 
  they 
  are 
  probably 
  in 
  that 
  

   formation. 
  Some 
  30 
  feet 
  above 
  the 
  river 
  is 
  the 
  foot 
  of 
  the 
  gorge 
  in 
  

   the 
  lower 
  part 
  of 
  the 
  Westkill 
  at 
  the 
  fails. 
  The 
  sides 
  of 
  the 
  gorge 
  

   are 
  perhaps 
  50 
  feet 
  in 
  hight 
  and 
  the 
  rocks 
  consist 
  of 
  sandstone 
  

   alternating 
  with 
  shales 
  of 
  olive, 
  blue 
  and 
  greenish 
  color. 
  In 
  the 
  

   blue 
  and 
  olive 
  shales 
  below 
  the 
  falls 
  are 
  numerous 
  specimens 
  of 
  

   Paracyclas 
  tenuis 
  Hall, 
  and 
  (?) 
  Beyrichia 
  sp. 
  is 
  also 
  common. 
  This 
  

   exposure 
  resembles 
  the 
  Sherburne 
  formation 
  in 
  lithologic 
  appear- 
  

   ance; 
  but 
  25 
  feet 
  higher 
  are 
  blue 
  shales 
  containing 
  a 
  number 
  of 
  

   Hamilton 
  species 
  so 
  that 
  it 
  is 
  perhaps 
  better 
  to 
  regard 
  this 
  zone 
  

   as 
  one 
  of 
  the 
  transitional 
  beds 
  from 
  the 
  Hamilton 
  to 
  the 
  Sher- 
  

   burne 
  formation. 
  Mather 
  mentioned 
  the 
  fossils 
  at 
  this 
  locality 
  

   stating 
  that 
  " 
  The 
  gray 
  grits 
  by 
  the 
  falls 
  at 
  the 
  tannery, 
  at 
  North 
  

   Blenheim, 
  contain 
  fossil 
  shells. 
  They 
  were 
  first 
  observed 
  by 
  

   Prof. 
  Vanuxem, 
  who 
  found 
  their 
  stratum 
  about 
  six 
  inches 
  thick. 
  

   Several 
  localities 
  were 
  observed 
  where 
  many 
  species 
  of 
  fine 
  shells 
  

   may 
  be 
  obtained, 
  in 
  the 
  bluish 
  and 
  brownish 
  gritty 
  shales 
  on 
  the 
  

   road 
  from 
  North 
  Blenheim 
  to 
  Gilboa." 
  a 
  

  

  Mather 
  also 
  indicated 
  the 
  top 
  of 
  the 
  Hamilton 
  on 
  his 
  section 
  

   <v 
  up 
  the 
  valley 
  of 
  Schoharie 
  creek 
  " 
  as 
  near 
  North 
  Blenheim 
  and 
  

   succeeded 
  by 
  the 
  Portage 
  group. 
  b 
  This 
  is 
  about 
  the 
  same 
  clas- 
  

   sification 
  as 
  that 
  indicated 
  above, 
  since 
  the 
  writer 
  regards 
  the 
  

  

  a 
  Geology 
  of 
  New 
  York, 
  1843, 
  pt 
  1, 
  p. 
  322-23. 
  

   *Ibid., 
  pi. 
  25, 
  fig. 
  6. 
  

  

  