﻿258 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  absence 
  of 
  fossils. 
  Some 
  60 
  feet 
  higher 
  than 
  the 
  lowest 
  shales 
  

   at 
  the 
  foot 
  of 
  Felter's 
  falls 
  is 
  a 
  layer 
  of 
  blue, 
  argillaceous 
  shale 
  

   (B 
  3 
  ) 
  in 
  which 
  Estheria 
  sp. 
  are 
  common. 
  Dr 
  John 
  M. 
  Clarke 
  after 
  

   examining 
  them 
  says 
  " 
  I 
  know 
  no 
  other 
  species 
  in 
  our 
  Devonian 
  

   except 
  my 
  E. 
  pule®, 
  which 
  is 
  a 
  little 
  fellow." 
  (Letter, 
  dated 
  Mar. 
  

   21, 
  1898) 
  

  

  Immediately 
  above 
  the 
  blue 
  shales 
  are 
  smooth, 
  green 
  shales 
  

   breaking 
  into 
  irregularly 
  shaped 
  pieces 
  in 
  which 
  no 
  fossils 
  were 
  

   found. 
  The 
  green 
  shales 
  are 
  about 
  40 
  feet 
  thick, 
  but 
  in 
  the 
  upper 
  

   part 
  of 
  the 
  falls 
  and 
  the 
  rocky 
  sides 
  of 
  the 
  glen 
  are 
  coarse, 
  bloeky, 
  

   red 
  and 
  mottled 
  shales 
  (B 
  4 
  ). 
  This 
  zone 
  is 
  five 
  feet 
  thick 
  and 
  part 
  

   of 
  it 
  is 
  very 
  arenaceous 
  almost 
  forming 
  a 
  sandstone. 
  This 
  

   stratum 
  is 
  the 
  lowest 
  of 
  the 
  clearly 
  red 
  rock 
  seen 
  in 
  the 
  glen 
  

   and 
  is 
  called 
  the 
  base 
  of 
  the 
  Oneonta 
  formation. 
  If 
  the 
  lowest 
  

   red 
  shale 
  (XXX 
  A 
  4 
  ) 
  in 
  the 
  Rensselaerville 
  glen 
  is 
  at 
  approximately 
  

   the 
  same 
  stratigraphical 
  position 
  then 
  there 
  is 
  a 
  dip 
  to 
  the 
  sse 
  of 
  

   62 
  feet 
  a 
  mile. 
  It 
  appears 
  probable 
  that 
  the 
  red 
  shale 
  of 
  XXX 
  C 
  5 
  

   at 
  the 
  northern 
  end 
  of 
  the 
  ridge 
  3.7 
  miles 
  north 
  of 
  Felter's 
  glen 
  

   represents 
  about 
  the 
  same 
  zone 
  as 
  B 
  4 
  in 
  this 
  gleu 
  which 
  gives 
  a 
  

   dip 
  directly 
  south 
  of 
  117 
  feet 
  a 
  mile. 
  

  

  Directly 
  on 
  the 
  top 
  of 
  the 
  zone 
  of 
  red 
  shale 
  and 
  185 
  feet 
  higher 
  

   than 
  the 
  base 
  of 
  the 
  section 
  is 
  a 
  red 
  sandstone 
  (B 
  5 
  ) 
  which 
  forms 
  

   the 
  brink 
  of 
  Felter's 
  falls. 
  Above 
  the 
  falls 
  for 
  a 
  short 
  distance 
  are 
  

   greenish, 
  irregular 
  shales, 
  then 
  red 
  and 
  mottled 
  red 
  and 
  green 
  

   argillaceous 
  shales, 
  but 
  after 
  a 
  few 
  rods 
  the 
  rise 
  is 
  very 
  gradual 
  

   and 
  the 
  rocks 
  are 
  concealed 
  by 
  drift. 
  The 
  red 
  shales 
  are 
  shown 
  

   at 
  various 
  places 
  along 
  the 
  ridge 
  to 
  the 
  north 
  of 
  Felter's 
  glen 
  

   toward 
  the 
  Rensselaerville-Clarksville 
  highway 
  and 
  also 
  on 
  the 
  

   sides 
  of 
  the 
  hills 
  flanking 
  Tenmile 
  creek 
  to 
  the 
  south 
  of 
  the 
  

   glen. 
  On 
  the 
  western 
  side 
  of 
  Tenmile 
  creek 
  on 
  the 
  highway 
  a 
  

   short 
  distance 
  north 
  of 
  Medusa 
  and 
  five 
  miles 
  south 
  of 
  Rensselaer- 
  

   ville 
  are 
  red 
  argillaceous 
  shales 
  125 
  feet 
  above 
  the 
  bed 
  of 
  the 
  

   creek 
  in 
  the 
  village, 
  while 
  on 
  the 
  same 
  road 
  just 
  north 
  of 
  Medusa 
  

   are 
  mottled 
  red 
  and 
  green 
  shales 
  only 
  45 
  feet 
  above 
  the 
  creek 
  

   level. 
  In 
  the 
  creek 
  bed 
  from 
  the 
  highway 
  bridge 
  to 
  the 
  foot 
  of 
  

   the 
  dam 
  are 
  greenish 
  and 
  bluish 
  shales 
  and 
  sandstones 
  apparently 
  

  

  