﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  269 
  

  

  top 
  of 
  the 
  Sherburne 
  formation. 
  The 
  dip 
  is 
  2^° 
  S, 
  60° 
  E 
  on 
  the 
  

   bank 
  of 
  Catskill 
  creek 
  below 
  the 
  bridge. 
  The 
  red 
  shales 
  at 
  this 
  

   locality 
  are 
  considered 
  to 
  be 
  the 
  base 
  of 
  the 
  Oneonta 
  formation 
  

   which 
  does 
  not 
  extend 
  much 
  farther 
  down 
  the 
  creek. 
  On 
  the 
  

   Geologic 
  map 
  of 
  New 
  York 
  the 
  base 
  of 
  the 
  Oneonta 
  formation 
  is 
  

   represented 
  about 
  three 
  miles 
  farther 
  down 
  the 
  creek 
  near 
  East 
  

   Durham, 
  but 
  there 
  are 
  occasional 
  exposures 
  of 
  the 
  red 
  rocks 
  

   along 
  the 
  creek 
  between 
  the 
  two 
  localities. 
  The 
  bed 
  of 
  Catskill 
  

   creek 
  east 
  of 
  East 
  Durham 
  is 
  composed 
  of 
  red 
  sandstone 
  while 
  

   on 
  the 
  western 
  bank 
  one 
  mile 
  above 
  the 
  East 
  Durham 
  bridge 
  

   there 
  is 
  a 
  ledge 
  25 
  feet 
  high 
  composed 
  of 
  red 
  shales 
  alternating 
  

   with 
  grayish 
  and 
  greenish 
  shales 
  and 
  sandstones. 
  There 
  is 
  a 
  

   heavy 
  dip 
  to 
  the 
  SE 
  along 
  this 
  part 
  of 
  the 
  creek 
  valley. 
  , 
  

  

  LVII 
  B 
  On 
  the 
  western 
  bank 
  of 
  Catskill 
  creek 
  just' 
  below 
  the 
  

   highway 
  bridge, 
  a 
  short 
  distance 
  south 
  of 
  Oakhill, 
  are 
  ledges 
  15 
  

   feet 
  in 
  thickness 
  (B 
  1 
  ). 
  These 
  rocks 
  are 
  mainly 
  greenish 
  argillaceous 
  

   shales 
  with 
  some 
  bluish 
  shale 
  and 
  alternating 
  with 
  them 
  are 
  sand- 
  

   stone 
  layers. 
  The 
  sandstones 
  are 
  bluish 
  to 
  greenish 
  in 
  color 
  and 
  

   the 
  fine 
  greenish 
  shales 
  contain 
  plenty 
  of 
  concretions 
  of 
  iron 
  

   pyrites, 
  which 
  in 
  weathering 
  stain 
  them 
  in 
  spots 
  and 
  streaks 
  a 
  

   rusty 
  color. 
  Loose 
  in 
  the 
  creek 
  is 
  a 
  large 
  conglomerate 
  boulder 
  

   containing 
  some 
  quartz 
  but 
  a 
  much 
  larger 
  number 
  of 
  clay 
  pebbles. 
  

   The 
  dip 
  at 
  this 
  locality 
  is 
  about 
  3° 
  S, 
  60° 
  E; 
  while 
  directly 
  south 
  

   the 
  rocks 
  appear 
  to 
  lie 
  nearly 
  horizontal. 
  In 
  this 
  region 
  of 
  south- 
  

   ern 
  Albany 
  and 
  northern 
  Greene 
  counties 
  there 
  has 
  been 
  appar- 
  

   ently 
  some 
  gentle 
  folding 
  which 
  is 
  well 
  obscured 
  by 
  the 
  heavy 
  

   covering 
  of 
  drift. 
  No 
  fossils 
  were 
  found 
  in 
  these 
  rocks 
  which 
  are 
  

   in 
  the 
  upper 
  part 
  of 
  the 
  Sherburne 
  formation. 
  Near 
  the 
  above 
  

   locality 
  a 
  stream 
  enters 
  Catskill 
  creek 
  from 
  the 
  west 
  which 
  I 
  

   have 
  called 
  Durham 
  creek, 
  and 
  a 
  section 
  along 
  this 
  creek 
  and 
  

   highway 
  from 
  the 
  creek 
  through 
  Durham 
  and 
  West 
  Durham 
  to 
  

   the 
  crest 
  of 
  the 
  eastern 
  line 
  of 
  the 
  Catskills 
  was 
  carefully 
  studied. 
  

   The 
  various 
  outcrops 
  found 
  along 
  this 
  section 
  are 
  shown 
  on 
  the 
  

   following 
  diagram 
  in 
  which 
  the 
  altitudes 
  are 
  based 
  upon 
  the 
  

   contour 
  lines 
  of 
  the 
  " 
  Durham 
  sheet 
  " 
  of 
  the 
  United 
  States 
  geo- 
  

   logical 
  survey. 
  

  

  