﻿224 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Schoharie 
  gorge 
  at 
  Gilboa, 
  and 
  on 
  the 
  hillside 
  155 
  feet 
  above 
  the 
  

   road 
  or 
  approximately 
  500 
  feet 
  above 
  the 
  Schoharie 
  at 
  Gilboa, 
  are 
  

   ledges 
  of 
  thin, 
  bluish 
  gray 
  sandstone. 
  These 
  sandstones 
  contain 
  

   a 
  few 
  fossils. 
  One 
  block 
  of 
  slightly 
  greenish 
  gray 
  color 
  was 
  found 
  

   which 
  contained 
  Spirifer 
  mesastrialis 
  Hall 
  in 
  abundance, 
  but 
  the 
  

   other 
  species 
  occur 
  rarely: 
  

  

  1 
  Spirifer 
  mesastrialis 
  Hall 
  (c) 
  

  

  2 
  S. 
  mucronatus 
  (Con.) 
  Bill. 
  (rr) 
  

  

  3 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (r) 
  

  

  4 
  Actmopteria 
  boydi 
  (Con.) 
  Hall 
  (?) 
  (rr) 
  

  

  5 
  Lamellibranch 
  undetermined 
  (rr) 
  

  

  Two 
  very 
  imperfectly 
  preserved 
  species. 
  

  

  This 
  fossiliferous 
  zone 
  is 
  more 
  than 
  200 
  feet 
  above 
  the 
  zone 
  of 
  

   red 
  sandstone 
  occurring 
  on 
  the 
  banks 
  of 
  the 
  Manorkill 
  (LXXV 
  F), 
  

   one 
  fourth 
  mile 
  above 
  its 
  mouth, 
  below 
  Strykersville. 
  That 
  may 
  

   not 
  be 
  the 
  stratigraphic 
  difference, 
  however, 
  for 
  if 
  the 
  general 
  

   dip 
  is 
  down 
  the 
  valley 
  to 
  the 
  southwest 
  then 
  its 
  position 
  is 
  lower 
  

   in 
  the 
  vicinity 
  of 
  the 
  Manorkill 
  falls. 
  

  

  90 
  feet 
  above 
  the 
  fossiliferous 
  zone 
  of 
  W 
  2 
  is 
  another 
  ledge 
  of 
  

   thin 
  bedded, 
  bluish 
  gray 
  sandstone 
  (W 
  3 
  ) 
  10 
  feet 
  in 
  thickness. 
  No 
  

   fossils 
  were 
  found 
  in 
  this 
  ledge. 
  Then 
  for 
  190 
  feet 
  the 
  rocks 
  are 
  

   concealed 
  when 
  a 
  heavy 
  ledge 
  of 
  thin 
  bedded, 
  bluish 
  gray 
  sand- 
  

   stone 
  (W 
  4 
  ) 
  15 
  feet 
  thick 
  occurs 
  at 
  the 
  edge 
  of 
  the 
  plateau 
  which 
  

   rises 
  from 
  this 
  ledge 
  very 
  gradually 
  toward 
  the 
  north. 
  No 
  

   fossils 
  were 
  found 
  or 
  red 
  rock 
  seen 
  in 
  place; 
  but 
  it 
  is 
  probable 
  

   that 
  formerly 
  the 
  plateau 
  was 
  capped 
  by 
  a 
  reddish 
  sandstone, 
  

   for 
  there 
  are 
  numerous 
  flat 
  and 
  angular 
  pieces 
  of 
  it 
  scattered 
  

   over 
  the 
  surface. 
  As 
  far 
  as 
  the 
  outcrops 
  are 
  concerned 
  there 
  are 
  

   no 
  layers 
  of 
  red 
  shale 
  or 
  sandstone 
  in 
  this 
  slope, 
  but 
  it 
  is 
  quite 
  

   probable 
  that 
  such 
  layers 
  occur 
  though 
  concealed 
  by 
  the 
  drift. 
  

   The 
  following 
  diagram 
  represents 
  graphically 
  the 
  above 
  section 
  : 
  

  

  