﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  157 
  

  

  barometer 
  gave 
  a 
  difference 
  of 
  1155 
  feet 
  from 
  the 
  fossiliferous 
  

   band 
  D 
  4 
  to 
  the 
  bridge 
  above 
  the 
  Hamilton 
  gorge 
  in 
  Richniond- 
  

   ville. 
  To 
  this 
  can 
  be 
  added 
  the 
  26 
  feet 
  of 
  coarse, 
  arenaceous 
  

   shales 
  shown 
  in 
  the 
  creek 
  in 
  Richmondville 
  which 
  will 
  give 
  at 
  

   least 
  1231 
  feet 
  for 
  the 
  Hamilton 
  formation 
  in 
  the 
  northern 
  slope 
  

   of 
  Summit 
  hill. 
  This, 
  undoubtedly, 
  is 
  not 
  the 
  entire 
  thickness 
  

   of 
  the 
  formation 
  since 
  the 
  shales 
  in 
  the 
  Richmondville 
  gorge 
  are 
  

   too 
  coarse 
  for 
  the 
  shales 
  at 
  the 
  base 
  of 
  the 
  Hamilton 
  formation. 
  

   From 
  the 
  base 
  of 
  the 
  shales 
  in 
  the 
  Richmondville 
  gorge 
  to 
  the 
  

   level 
  of 
  the 
  Cobleskill 
  is 
  45 
  feet, 
  which 
  is 
  covered. 
  The 
  above 
  

   section 
  is 
  a 
  fairly 
  accurate 
  one, 
  for 
  the 
  altitude 
  of 
  the 
  Richmond- 
  

   ville 
  railroad 
  station 
  is 
  1174 
  feet 
  A. 
  T. 
  and 
  that 
  of 
  Summit 
  hill 
  

   2428 
  feet, 
  making 
  a 
  difference 
  of 
  1254 
  feet 
  between 
  the 
  station 
  

   and 
  the 
  top 
  of 
  the 
  hill; 
  while 
  the 
  barometric 
  section 
  is 
  1276 
  feet 
  

   which 
  is 
  only 
  22 
  feet 
  too 
  great. 
  From 
  the 
  Richmondville 
  gorge 
  

   to 
  Warnerville 
  there 
  is 
  a 
  fall 
  of 
  200 
  feet 
  which 
  makes 
  at 
  least 
  a 
  

   thickness 
  of 
  1355 
  feet 
  for 
  the 
  Hamilton 
  and 
  Marcellus 
  formations, 
  

   without 
  taking 
  into 
  consideration 
  the 
  dip 
  which 
  would 
  increase 
  

   the 
  amount. 
  The 
  barometric 
  section 
  from 
  the 
  top 
  of 
  Summit 
  

   hill 
  to 
  Warnerville 
  is 
  1500 
  feet. 
  This 
  is 
  not 
  far 
  from 
  correct 
  for 
  

   the 
  difference 
  between 
  the 
  Cobleskill 
  railroad 
  station, 
  near 
  the 
  

   same 
  level 
  as 
  Warnerville, 
  and 
  the 
  top 
  of 
  Summit 
  hill 
  is 
  1526 
  

   feet. 
  The 
  diagrammatic 
  form 
  of 
  the 
  above 
  section 
  is 
  given 
  

   in 
  an 
  accompanying 
  figure. 
  

  

  LI 
  A. 
  The 
  brook 
  on 
  which 
  the 
  Richmondville 
  gorge, 
  mentioned 
  

   above, 
  occurs 
  rises 
  in 
  the 
  northern 
  part 
  of 
  Summit 
  township 
  and 
  

   cuts 
  a 
  deep 
  and 
  narrow 
  gorge 
  on 
  the 
  northern 
  slope 
  of 
  Summit 
  

   hill 
  known 
  as 
  Bear's 
  gulf. 
  There 
  are 
  numerous 
  exposures 
  along 
  

   this 
  stream 
  to 
  the 
  gulf, 
  and 
  the 
  section 
  given 
  has 
  been 
  con- 
  

   structed 
  from 
  the 
  Cobleskill 
  along 
  this 
  brook 
  through 
  Bear's 
  gulf 
  

   and 
  to 
  the 
  top 
  of 
  Summit 
  hill. 
  The 
  total 
  thickness 
  of 
  the 
  section 
  

   is 
  not 
  as 
  accurate 
  as 
  the 
  one 
  already 
  described, 
  for 
  it 
  makes 
  the 
  

   difference 
  between 
  the 
  Richmondville 
  railroad 
  station 
  and 
  the 
  

   top 
  of 
  the 
  hill 
  1340 
  feet, 
  which 
  is 
  86 
  feet 
  too 
  great. 
  The 
  "gulf" 
  is 
  

   a 
  narrow 
  glen 
  bounded 
  by 
  steep 
  walls 
  composed 
  largely 
  of 
  Hamil- 
  

   ton 
  sandstones 
  or 
  coarse, 
  arenaceous 
  shales, 
  a 
  general 
  idea 
  of 
  

  

  