﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  215 
  

  

  the 
  stratum 
  of 
  red 
  rock 
  in 
  the 
  river 
  gorge, 
  which 
  are 
  coarse 
  

   grained 
  and 
  grayish 
  or 
  greenish 
  gray; 
  then 
  there 
  are 
  greenish 
  

   shales 
  followed 
  by 
  reddish 
  sandstone. 
  Higher 
  are 
  greenish 
  and 
  

   bluish 
  shales 
  and 
  sandstones, 
  and 
  about 
  200 
  feet 
  above 
  the 
  

   river 
  level 
  is 
  the 
  top 
  of 
  another 
  zone 
  of 
  red 
  shales. 
  

  

  LXXV 
  A 
  2-4 
  . 
  By 
  the 
  side 
  of 
  the 
  highway 
  toward 
  Grand 
  Gorge 
  

   near 
  the 
  southern 
  line 
  of 
  Gilboa 
  township, 
  375 
  feet 
  above 
  the 
  Scho- 
  

   harie 
  river 
  at 
  Gilboa, 
  are 
  grayish 
  to 
  greenish 
  gray 
  non-fossilifer- 
  

   ous 
  sandstones 
  alternating 
  for 
  about 
  15 
  feet 
  with 
  thin 
  layers 
  

   in 
  which 
  fossils 
  are 
  very 
  abundant. 
  The 
  most 
  abundant 
  species 
  is 
  

   Spirifer 
  mesastrialis 
  Hall, 
  and 
  these 
  shells 
  are 
  so 
  numerous 
  that 
  

   the 
  layers 
  form 
  a 
  sort 
  of 
  fire 
  stone. 
  These 
  are 
  succeeded 
  by 
  some 
  

   30 
  feet 
  of 
  greenish 
  gray, 
  thin 
  bedded 
  sandstones 
  (A 
  3 
  ) 
  at 
  the 
  sur- 
  

   face 
  which 
  at 
  a 
  greater 
  depth 
  form 
  massive 
  layers 
  that 
  are 
  some- 
  

   what 
  irregularly 
  bedded. 
  The 
  dip 
  as 
  measured 
  by 
  the 
  ledges 
  at 
  

   the 
  side 
  of 
  the 
  road 
  varies 
  from 
  a 
  little 
  less 
  to 
  more 
  than 
  2° 
  S, 
  50° 
  

   W. 
  There 
  is 
  an 
  occasional 
  fossil 
  in 
  these 
  sandstones 
  as 
  well 
  as 
  

   some 
  clay 
  pebbles. 
  Below 
  a 
  ledge 
  of 
  massive, 
  irregularly 
  bedded 
  

   sandstone 
  are 
  bluish, 
  rather 
  thin, 
  argillaceous 
  shales. 
  These 
  

   rocks 
  make 
  a 
  prominent 
  ledge 
  in 
  appearance, 
  not 
  unlike 
  certain 
  

   sandstones 
  in 
  the 
  Oneonta 
  formation. 
  At 
  the 
  top 
  of 
  these 
  sand- 
  

   stones, 
  420 
  feet 
  above 
  the 
  river 
  at 
  Gilboa 
  is 
  another 
  fossiliferous 
  

   zone, 
  (A 
  4 
  ), 
  having 
  the 
  lithologic 
  appearance 
  of 
  the 
  lower 
  one 
  and 
  

   containing 
  abundant 
  specimens 
  of 
  Spirifer 
  mesastrialis 
  Hall. 
  

   From 
  zones 
  A 
  2 
  and 
  A 
  4 
  the 
  following 
  species 
  were 
  collected: 
  

  

  1 
  Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  (r) 
  

  

  2 
  S. 
  mesastrialis 
  Hall 
  (aa) 
  

  

  Very 
  abundant 
  in 
  these 
  thin 
  layers. 
  

  

  3 
  CamarotoechiaeximiaHa.il 
  (c) 
  

  

  4 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (a) 
  

  

  5 
  Palaeoneilo 
  emargmata 
  (Con.) 
  Hall 
  var. 
  (r) 
  

  

  6 
  Microdon 
  (Gypricardella) 
  complanatus 
  Hall 
  (rr) 
  

   1 
  M. 
  (G. 
  ) 
  gregarius 
  Hall 
  (rr) 
  

   8 
  Actmopteria 
  boydi 
  (Con.) 
  Hall 
  (r) 
  

  

  