﻿CLASSIFICATION, 
  ETC. 
  OP 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  271 
  

  

  south. 
  Loose 
  shales 
  were 
  also 
  found 
  at 
  this 
  place 
  which 
  contain 
  

   a 
  fair 
  number 
  of 
  fossils, 
  apparently 
  Hamilton 
  species. 
  Perhaps 
  

   the 
  shales 
  are 
  from 
  a 
  boulder 
  though 
  they 
  are 
  lumpy 
  as 
  though 
  

   they 
  had 
  not 
  been 
  transported 
  very 
  far. 
  

  

  The 
  fossiliferous 
  layer 
  described 
  above 
  occurs 
  475 
  feet 
  higher 
  

   than 
  the 
  red 
  shales 
  of 
  B 
  2 
  in 
  the 
  creek 
  below 
  Durham. 
  Red 
  shales 
  

   and 
  sandstones 
  are 
  conspicuous 
  at 
  various 
  localities 
  on 
  the 
  west- 
  

   ern 
  side 
  of 
  Catskill 
  creek 
  below 
  this 
  fossiliferous 
  bed 
  and 
  all 
  of 
  

   that 
  region 
  is 
  colored 
  as 
  in 
  the 
  Oneonta 
  formation 
  on 
  the 
  Geologic 
  

   map 
  of 
  New 
  York. 
  This 
  classification 
  has 
  been 
  accepted 
  by 
  the 
  

   author 
  for 
  the 
  purpose 
  of 
  geological 
  mapping 
  for, 
  on 
  account 
  of 
  

   the 
  almost 
  entire 
  absence 
  of 
  fossils 
  it 
  would 
  be 
  next 
  to 
  impossible 
  

   to 
  draw 
  a 
  line 
  separating 
  these 
  formations 
  unless 
  some 
  prominent 
  

   lithologic 
  character 
  like 
  the 
  first 
  appearance 
  of 
  the 
  reds 
  be 
  select- 
  

   ed 
  for 
  such 
  purpose. 
  Such 
  a 
  line 
  is 
  not 
  a 
  continuous 
  one 
  for 
  it 
  

   represents 
  horizons 
  of 
  somewhat 
  different 
  geological 
  age 
  at 
  differ- 
  

   ent 
  localities, 
  but 
  perhaps 
  it 
  is 
  as 
  good 
  a 
  method 
  as 
  can 
  be 
  de- 
  

   vised 
  for 
  the 
  separation 
  of 
  these 
  rocks. 
  It 
  seems 
  to 
  the 
  author 
  

   that 
  this 
  lentil 
  of 
  fossils 
  475 
  feet 
  above 
  the 
  base 
  of 
  the 
  reds 
  shows 
  

   conclusively 
  that 
  the 
  reds 
  in 
  Albany 
  and 
  Greene 
  counties 
  ap- 
  

   peared 
  near 
  the 
  close 
  of 
  the 
  Sherburne 
  and 
  practically 
  replaced 
  

   the 
  Ithaca 
  formation 
  by 
  rocks 
  which 
  are 
  indistinguishable 
  from 
  

   those 
  of 
  the 
  Oneonta 
  formation. 
  On 
  the 
  road 
  815 
  feet 
  higher 
  

   than 
  Catskill 
  creek 
  are 
  greenish 
  argillaceous 
  shales 
  containing 
  

   fragments 
  of 
  plant 
  stems. 
  Greenish 
  and 
  reddish 
  shales, 
  the 
  reds 
  

   rather 
  arenaceous, 
  occur 
  75 
  feet 
  higher. 
  At 
  the 
  base 
  is 
  a 
  grayish 
  

   sandstone 
  and 
  the 
  entire 
  outcrop 
  is 
  25 
  feet 
  in 
  thickness. 
  This 
  

   locality 
  is 
  on 
  the 
  road 
  just 
  east 
  of 
  the 
  stone 
  schoolhouse 
  and 
  one 
  

   mile 
  east 
  of 
  West 
  Durham. 
  At 
  the 
  forks 
  of 
  the 
  road 
  just 
  west 
  

   of 
  West 
  Durham 
  and 
  the 
  cemetery 
  are 
  coarse, 
  greenish 
  sand- 
  

   stones 
  alternating 
  with 
  red 
  and 
  green 
  shales, 
  1330 
  feet 
  higher 
  

   than 
  Catskill 
  creek. 
  Glacial 
  striae 
  show 
  very 
  well 
  on 
  top 
  of 
  the 
  

   greenish 
  gray 
  sandstone 
  running 
  about 
  W, 
  10° 
  N, 
  and 
  E, 
  10° 
  S. 
  

   Below 
  the 
  fork 
  toward 
  W^est 
  Durham 
  there 
  is 
  greenish 
  sandstone 
  

   alternating 
  with 
  reddish 
  shale, 
  but 
  for 
  50 
  feet 
  or 
  more 
  the 
  sand- 
  

   stone 
  predominates. 
  Just 
  above 
  the 
  fork 
  on 
  the 
  road 
  turning 
  

  

  