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  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Potuck 
  creek 
  southward 
  to 
  the 
  Catskill 
  creek 
  valley. 
  At 
  the 
  

   southern 
  end 
  of 
  Potuck 
  creek 
  the 
  rocks 
  dip 
  about 
  8° 
  W. 
  

  

  In 
  the 
  gorge 
  of 
  the 
  Potuck 
  at 
  the 
  Potuck 
  mill 
  about 
  one 
  mile 
  

   north 
  of 
  the 
  Catskill 
  creek 
  road 
  are 
  greenish 
  argillaceous 
  shales 
  

   at 
  the 
  base 
  and 
  in 
  the 
  upper 
  part 
  of 
  the 
  banks 
  are 
  bluish 
  shales 
  

   and 
  sandstones, 
  some 
  of 
  which 
  show 
  very 
  good 
  examples 
  of 
  rip- 
  

   ple 
  marks. 
  No 
  fossils 
  were 
  found 
  though 
  careful 
  search 
  was 
  

   made 
  for 
  them, 
  and 
  the 
  dip 
  is 
  8° 
  W. 
  These 
  rocks 
  apparently 
  be- 
  

   long 
  in 
  the 
  Sherburne 
  formation 
  and 
  this 
  conclusion 
  is 
  supported 
  

   by 
  the 
  presence 
  of 
  red 
  shales 
  215 
  feet 
  higher 
  on 
  the 
  steep, 
  eastern 
  

   side 
  of 
  the 
  southern 
  end 
  of 
  Indian 
  ridge. 
  Red 
  sandstone 
  and 
  

   shales 
  outcrop 
  at 
  the 
  three 
  corners 
  at 
  the 
  southern 
  end 
  of 
  Indian 
  

   ridge 
  145 
  feet 
  higher 
  than 
  the 
  outcrop 
  mentioned 
  on 
  the 
  eastern 
  

   slope. 
  On 
  the 
  road 
  down 
  the 
  southern 
  end 
  of 
  the 
  ridge 
  from 
  the 
  

   above 
  three 
  corners 
  there 
  are 
  several 
  outcrops 
  of 
  red 
  shale, 
  the 
  

   lowest 
  one 
  only 
  65 
  feet 
  above 
  the 
  level 
  of 
  the 
  Catskill 
  creek 
  road. 
  

   Red 
  argillaceous 
  shales 
  with 
  red 
  sandstone 
  above 
  are 
  shown 
  on 
  

   the 
  northern 
  bank 
  of 
  the 
  Catskill 
  creek 
  below 
  the 
  place 
  at 
  which 
  

   the 
  highway 
  turns 
  toward 
  Cairo. 
  The 
  Sherburne 
  formation 
  does 
  

   not 
  extend 
  much 
  farther 
  up 
  this 
  valley 
  and 
  it 
  is 
  at 
  about 
  this 
  

   point 
  that 
  the 
  base 
  of 
  the 
  Oneonta 
  formation 
  is 
  represented 
  as 
  

   crossing 
  the 
  creek 
  on 
  the 
  Geologic 
  map 
  of 
  New 
  York. 
  

  

  On 
  the 
  bank 
  of 
  a 
  small 
  brook 
  entering 
  Catskill 
  creek 
  from 
  the 
  

   south 
  one 
  half 
  mile 
  above 
  South 
  Cairo 
  are 
  red 
  argillaceous 
  

   shales 
  and 
  sandstones 
  of 
  the 
  Oneonta 
  formation. 
  Above 
  the 
  

   reds 
  are 
  coarse, 
  gray 
  to 
  bluish 
  sandstones 
  which 
  dip 
  8° 
  S, 
  20° 
  E. 
  

   Farther 
  west 
  toward 
  Cairo 
  a 
  prominent 
  ledge 
  of 
  sandstone, 
  on 
  

   which 
  glacial 
  striae 
  are 
  nicely 
  shown 
  running 
  a 
  little 
  E 
  of 
  S, 
  

   crosses 
  the 
  highway. 
  On 
  the 
  southern 
  bank 
  of 
  Catskill 
  creek 
  

   one 
  and 
  one 
  fourth 
  miles 
  below 
  South 
  Cairo 
  and 
  nearly 
  opposite 
  

   Potuck 
  creek 
  are 
  green 
  argillaceous 
  shales 
  and 
  sandstones 
  below 
  

   which 
  is 
  very 
  hard, 
  coarse 
  grained, 
  greenish 
  to 
  reddish 
  sandstone 
  

   with 
  some 
  red 
  argillaceous 
  shales. 
  The 
  dip 
  is 
  from 
  3J° 
  to 
  5° 
  N,. 
  

   70° 
  W. 
  This 
  variation 
  in 
  the 
  direction 
  of 
  the 
  dip 
  noted 
  at 
  dif- 
  

   ferent 
  places 
  along 
  this 
  part 
  of 
  Catskill 
  creek 
  shows 
  that 
  the 
  

   rocks 
  are 
  gently 
  folded 
  in 
  this 
  region. 
  

  

  