﻿CLASSIFICATION, 
  ETC. 
  OP 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  79 
  

  

  In 
  estimating 
  the 
  thickness 
  of 
  the 
  rocks 
  in 
  the 
  above 
  section 
  

   I 
  am 
  indebted 
  to 
  Prof. 
  Henry 
  S. 
  Williams 
  who 
  has 
  kindly 
  loaned 
  

   me 
  notes 
  made 
  by 
  me 
  some 
  years 
  ago 
  when 
  at 
  work 
  on 
  the 
  U. 
  S. 
  

   geological 
  survey 
  under 
  his 
  direction. 
  These 
  readings 
  have 
  been 
  

   compared 
  with 
  those 
  taken 
  during 
  the 
  progress 
  of 
  the 
  field 
  work 
  

   upon 
  which 
  this 
  report 
  is 
  based, 
  which 
  on 
  account 
  of 
  storms 
  were 
  

   not 
  as 
  satisfactory 
  as 
  desired. 
  The 
  same 
  acknowledgment 
  should 
  

   be 
  made 
  in 
  reference 
  to 
  the 
  sections 
  described 
  later, 
  north 
  of 
  

   Otego 
  and 
  Sidney. 
  

  

  The 
  red 
  and 
  gray 
  sandstones 
  forming 
  the 
  " 
  Oneonta 
  ledge 
  " 
  near 
  

   the 
  top 
  of 
  Powell 
  hill, 
  northwest 
  of 
  Oneonta, 
  are 
  important 
  in 
  

   the 
  history 
  of 
  the 
  nomenclature 
  of 
  the 
  New 
  York 
  formations, 
  since 
  

   they 
  are 
  probably 
  the 
  typical 
  outcrop 
  to 
  which- 
  Vanuxem 
  in 
  1840 
  

   applied 
  the 
  name 
  " 
  sandstone 
  of 
  Oneonta" 
  describing 
  the 
  forma- 
  

   tion 
  as 
  consisting 
  " 
  of 
  many 
  veins 
  of 
  gray 
  sandstone, 
  and 
  some- 
  

   times) 
  of 
  red 
  sandstone; 
  when 
  weathered 
  at 
  exhibits 
  a 
  peculiar 
  

   structure, 
  to 
  all 
  appearance 
  owing 
  to 
  the 
  manner 
  in 
  which 
  it 
  was 
  

   deposited 
  from 
  water; 
  in 
  this 
  rock 
  we 
  often 
  find 
  the 
  remains 
  of 
  

   terrestrial 
  plants, 
  and 
  sometimes 
  they 
  are 
  thrown 
  together 
  in 
  such 
  

   numbers 
  as 
  to 
  form 
  a 
  thin 
  mass 
  of 
  coal, 
  extending 
  for 
  a 
  few 
  feet, 
  

   but 
  only 
  an 
  inch 
  or 
  more 
  in 
  thickness 
  ; 
  this 
  rock 
  is 
  found 
  in 
  Otsego, 
  

   Chenango 
  and 
  Broome 
  counties. 
  " 
  a 
  While 
  in 
  his 
  final 
  report 
  in 
  

   describing 
  the 
  localities 
  where 
  the 
  crossbedded 
  structure 
  of 
  the 
  

   Gatskill 
  group 
  6 
  is 
  shown 
  in 
  the 
  most 
  marked 
  manner 
  he 
  cites 
  

   " 
  the 
  hillside, 
  near 
  the 
  top, 
  below 
  Oneonta." 
  As 
  already 
  stated 
  

   and 
  shown 
  on 
  the 
  section, 
  the 
  Writer 
  refers 
  the 
  fossiliferous 
  rocks 
  

   in 
  the 
  lower 
  part 
  of 
  Powell 
  hill, 
  at 
  least 
  to 
  the 
  top 
  of 
  D 
  8 
  , 
  209 
  feet 
  

   above 
  the 
  railroad, 
  to 
  the 
  Ithaca 
  formation. 
  Many 
  different 
  

   opinions 
  have 
  been 
  expressed 
  in 
  reference 
  to 
  the 
  correlation 
  of 
  

   these 
  fossiliferous 
  deposits 
  and 
  it 
  may 
  be 
  of 
  interest 
  to 
  recall 
  some 
  

   of 
  the 
  more 
  important 
  ones. 
  

  

  a 
  4th 
  an. 
  rep't 
  third 
  district 
  (assembly 
  document 
  no. 
  50, 
  1840) 
  p. 
  381. 
  

  

  & 
  As 
  already 
  explained 
  in 
  his 
  final 
  report 
  Vanuxem 
  referred 
  the 
  Oneonta 
  sandstone 
  

   to 
  the 
  Catskill 
  formation; 
  a 
  classification 
  that 
  is 
  now 
  abandoned. 
  

   c 
  Geology 
  of 
  New 
  York. 
  1842. 
  pt 
  3, 
  p. 
  187. 
  

  

  