﻿282 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  them 
  across 
  this 
  county. 
  It 
  is 
  a 
  difficult 
  region 
  to 
  map 
  and 
  in 
  

   places 
  the 
  indicated 
  lines 
  are 
  probably 
  only 
  an 
  approximation. 
  

   In 
  the 
  above 
  account 
  the 
  localities 
  at 
  which 
  the 
  outcrops 
  near 
  

   the 
  dividing 
  lines 
  occur 
  have 
  been 
  described 
  so 
  fully 
  that 
  it 
  is 
  

   not 
  deemed 
  necessary 
  to 
  define 
  the 
  course 
  of 
  these 
  lines 
  and 
  all 
  

   interested 
  in 
  their 
  position 
  may 
  follow 
  them 
  readily 
  on 
  the 
  geo- 
  

   logical 
  map. 
  

  

  Greene 
  county 
  Catskills 
  

  

  The 
  western 
  and 
  central 
  portions 
  of 
  Greene 
  county 
  are 
  in 
  the 
  

   Catskill 
  mountain 
  region, 
  the 
  rocks 
  of 
  the 
  greater 
  part 
  belonging 
  

   in 
  the 
  Catskill 
  formation 
  for 
  which 
  it 
  is 
  the 
  typical 
  region 
  of 
  the 
  

   " 
  Catskill 
  division 
  " 
  as 
  they 
  were 
  called 
  by 
  Mather. 
  His 
  detailed 
  

   section 
  " 
  from 
  the 
  top 
  of 
  the 
  South 
  mountain 
  near 
  the 
  Mountain 
  

   house 
  on 
  the 
  Catskills, 
  down 
  to 
  the 
  Helderberg 
  division 
  at 
  the 
  

   Kaaterskill 
  creek," 
  gave 
  the 
  rocks 
  of 
  the 
  Catskill 
  and 
  Erie 
  divis- 
  

   ions 
  6 
  and 
  extended 
  from 
  the 
  eastern 
  part 
  of 
  Hunter 
  northeasterly 
  

   across 
  the 
  southern 
  part 
  of 
  Catskill 
  township 
  to 
  the 
  Kaaterskill 
  

   creek. 
  

  

  In 
  1874 
  Mr 
  Andrew 
  Sherwood 
  measured 
  very 
  accurately 
  a 
  sec- 
  

   tion 
  of 
  these 
  rocks 
  beginning 
  in 
  the 
  Kaaterskill 
  creek 
  at 
  Palen- 
  

   ville, 
  following 
  the 
  famous 
  Kaaterskill 
  clove 
  and 
  continuing 
  to 
  

   the 
  top 
  of 
  Bound 
  Top 
  mountain 
  to 
  the 
  south 
  of 
  the 
  clove 
  . 
  

  

  Sherwood's 
  total 
  thickness 
  for 
  the 
  rocks 
  from 
  the 
  upper 
  part 
  

   of 
  Palenville 
  to 
  the 
  top 
  of 
  Round 
  Top 
  is 
  3482 
  feet, 
  while 
  Prof. 
  . 
  

   Hall 
  estimated 
  the 
  thickness 
  of 
  all 
  the 
  rocks 
  from 
  the 
  top 
  of 
  the 
  

   Hamilton 
  formation 
  to 
  the 
  summit 
  of 
  Round 
  Top 
  as 
  5800 
  feet. 
  d 
  

   Sherwood 
  gave 
  accurately 
  the 
  lithologic 
  characters 
  and 
  thickness 
  

   of 
  the 
  various 
  strata 
  so 
  that 
  there 
  is 
  no 
  need 
  for 
  another 
  de- 
  

   tailed 
  account 
  of 
  this 
  typical' 
  Catskill 
  section. 
  Sherwood 
  cor- 
  

   related 
  the 
  red 
  and 
  green 
  shales 
  (no. 
  94 
  of 
  his 
  section) 
  in 
  the 
  

  

  a 
  Geology 
  of 
  New 
  York. 
  1843. 
  P. 
  1, 
  p. 
  302-5. 
  

  

  b 
  " 
  The 
  Erie 
  division 
  in 
  the 
  first 
  geological 
  district 
  consists 
  of 
  the 
  following 
  groups: 
  

  

  1 
  Ithaca 
  and 
  Chemung 
  group 
  

  

  2 
  Hamilton 
  group 
  

  

  3 
  Marcellus 
  shales." 
  Ibid., 
  p. 
  317. 
  

  

  c 
  Proc. 
  Amer. 
  philosophical 
  society, 
  1878, 
  17 
  : 
  346-47. 
  This 
  section 
  was 
  also 
  republished 
  by 
  A6hburner 
  

   In 
  the 
  Second 
  geological 
  survey 
  of 
  Pennsylvania, 
  F. 
  1878, 
  p. 
  218-19, 
  while 
  Prof. 
  James 
  Hall 
  has 
  given 
  

   an 
  account 
  of 
  it 
  in 
  the 
  28th 
  Report 
  N. 
  Y. 
  state 
  museum 
  of 
  natural 
  history, 
  1879, 
  p. 
  14-15. 
  

  

  d 
  Proc. 
  Am. 
  ass'n 
  adv. 
  science. 
  24: 
  82, 
  83. 
  

  

  