﻿494 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  graiirvaries 
  somewhat. 
  The 
  texture 
  is 
  porous 
  and 
  the 
  hardness 
  

   is 
  high. 
  The 
  beds 
  of 
  which 
  the 
  masses 
  are 
  constituted 
  vary 
  from 
  

   half 
  an 
  inch 
  to 
  a 
  foot 
  in 
  thickness, 
  the 
  same 
  bed 
  often 
  presenting 
  

   considerable 
  variability 
  in 
  this 
  regard. 
  The 
  intercalated 
  shales 
  

   are 
  in 
  beds 
  from 
  a 
  few 
  inches 
  to 
  eight 
  or 
  ten 
  feet 
  in 
  thickness. 
  

   Their 
  color 
  is 
  dark 
  gray 
  to 
  black 
  in 
  greater 
  part, 
  but 
  some 
  

   portions 
  are 
  brownish 
  or 
  greenish. 
  Among 
  the 
  upper 
  members 
  

   of 
  the 
  series 
  there 
  are 
  several 
  thin, 
  discontinuous 
  streaks 
  of 
  light 
  

   greenish 
  and 
  reddish 
  shales 
  interbedded 
  among 
  the 
  dark 
  shales 
  

   and 
  constituting 
  beds 
  of 
  passage 
  to 
  the 
  overlying 
  Upper 
  Flag 
  

   series. 
  • 
  

  

  Thin 
  streaks 
  of 
  quartz 
  conglomerate 
  were 
  noticed 
  at 
  several 
  

   localities 
  interbedded 
  among 
  the 
  flags, 
  notably 
  in 
  the 
  lower 
  beds 
  

   of 
  the 
  Jocky 
  Hill 
  region 
  

  

  The 
  flag 
  beds 
  are 
  exposed 
  over 
  wide 
  areas 
  in 
  the 
  quarry 
  

   districts 
  of 
  Saugerties, 
  Kingston, 
  Hurley 
  and 
  Marble 
  town 
  town- 
  

   ships 
  where 
  they 
  dip 
  gently 
  to 
  the 
  westward. 
  The 
  heavy 
  masses 
  

   give 
  rise 
  to 
  terraces 
  separated 
  by 
  slopes 
  of 
  shale 
  or 
  the 
  thinner- 
  

   bedded, 
  softer 
  sandstones'. 
  In 
  southern 
  Rochester 
  and 
  Wawar- 
  

   sing 
  townships 
  the 
  beds 
  are 
  tilted 
  steeply 
  to 
  the 
  westward 
  and 
  

   their 
  outcrop 
  belt 
  is 
  greatly 
  narrowed. 
  In 
  this 
  region 
  their 
  

   upturned 
  edges 
  give 
  rise 
  to 
  a 
  high, 
  rough 
  range 
  of 
  hills 
  lying 
  

   between 
  the 
  foot 
  of 
  the 
  Catskills 
  and 
  the 
  Rondout-Sandburg 
  

   valley. 
  

  

  The 
  thickness 
  of 
  the 
  Upper 
  Flag 
  series 
  is 
  about 
  500 
  feet, 
  but 
  no 
  

   careful 
  measurement 
  was 
  made. 
  

  

  The 
  age 
  of 
  the 
  series 
  is 
  not 
  definitely 
  known, 
  but 
  it 
  is 
  in 
  the 
  

   main 
  of 
  the 
  upper 
  Hamilton 
  group 
  ; 
  the 
  shales 
  and 
  some 
  of 
  the 
  

   sandstone 
  beds 
  contain 
  fossils, 
  but 
  these 
  have 
  not 
  yet 
  been 
  

   studied. 
  

  

  Hamilton 
  shales. 
  — 
  This 
  formation 
  consists 
  of 
  a 
  series 
  of 
  dark- 
  

   gray 
  to 
  black 
  or 
  brown 
  shales 
  containing 
  thin 
  sandy 
  beds, 
  par- 
  

   ticularly 
  in 
  its 
  upper 
  part. 
  It 
  constitutes 
  the 
  steep 
  slopes 
  rising 
  

   from 
  the 
  wide 
  valley 
  of 
  Onondaga 
  limestone 
  to 
  the 
  terraces 
  and 
  

   plateaus 
  of 
  the 
  Lower 
  Flag 
  series. 
  In 
  Wawarsing 
  township, 
  where 
  

   the 
  beds 
  are 
  steeply 
  tilted, 
  all 
  but 
  its 
  uppermost 
  members 
  are 
  

   deeply 
  eroded 
  and 
  underlie 
  the 
  western 
  side 
  of 
  the 
  Sandburg 
  

   Creek 
  valley. 
  In 
  Mount 
  Marion 
  southwest 
  of 
  Saugerties 
  the 
  

   formation 
  attains 
  its 
  greatest 
  prominence, 
  rising 
  in 
  a 
  steep 
  face 
  

  

  