﻿Report 
  of 
  the 
  State 
  Geologist. 
  557 
  

  

  abruptly. 
  The 
  red 
  shales 
  occur 
  in 
  greatest 
  amount 
  to 
  the 
  north- 
  

   ward 
  and 
  in 
  lower 
  members. 
  Southward 
  they 
  become 
  unim- 
  

   portant 
  features 
  of 
  the 
  stratigraphy, 
  but 
  there 
  are 
  several 
  beds 
  

   conspicuous 
  in 
  the 
  lower 
  members 
  and 
  others 
  are 
  contained 
  at 
  

   long 
  intervals 
  above. 
  To 
  the 
  northward 
  in 
  the 
  Overlook 
  moun- 
  

   tain 
  region, 
  they 
  occur 
  in 
  frequent 
  succession 
  from 
  the 
  base 
  of 
  

   the 
  mountains 
  far 
  up 
  the 
  slopes. 
  Along 
  the 
  Esopus 
  valley 
  the 
  

   red 
  shales 
  often 
  occur 
  in 
  the 
  lower 
  members, 
  but 
  they 
  are 
  rare 
  

   above. 
  In 
  the 
  high 
  region 
  in 
  the 
  western 
  part 
  of 
  the 
  county, 
  

   the 
  formations 
  are 
  piled 
  up 
  to 
  a 
  thickness, 
  which 
  is 
  not 
  far 
  

   from 
  4000 
  feet. 
  ' 
  Owing 
  to 
  frequent 
  variation 
  in 
  the 
  amount 
  of 
  

   dip, 
  estimates 
  of 
  thickness 
  for 
  wide 
  areas 
  cannot 
  be 
  made 
  with 
  

   any 
  degree 
  of 
  accuracy 
  without 
  elaborate 
  measurements, 
  and 
  

   these 
  I 
  had 
  not 
  the 
  time 
  to 
  make. 
  A 
  section 
  through 
  Slide 
  moun- 
  

   tain 
  and 
  adjoining 
  ranges 
  is 
  given 
  in 
  the 
  left 
  end 
  in 
  figure 
  1, 
  

   and 
  this 
  is 
  typical 
  for 
  the 
  higher 
  bank 
  of 
  the 
  southern 
  Catskills. 
  

   The 
  upper 
  flag 
  series 
  in 
  this 
  portion 
  of 
  the 
  region 
  consists 
  of 
  

   thin 
  to 
  thick-bedded 
  sandstones 
  of 
  moderately 
  coarse 
  grain, 
  from 
  

   brownish- 
  gray 
  to 
  greenish-gray 
  in 
  color, 
  sometimes 
  reddish, 
  with 
  

   occasional 
  intercalations 
  of 
  red 
  shale 
  which 
  were 
  not 
  well 
  exposed 
  

   in 
  the 
  outcrops 
  that 
  I 
  saw. 
  This 
  series 
  grades 
  above 
  into 
  coarser, 
  

   thicker-bedded 
  red 
  sandstones 
  containing 
  quartz 
  pebbles 
  dissem- 
  

   inated 
  and 
  in 
  streaks 
  of 
  varying 
  thickness. 
  The 
  rock 
  cannot 
  be 
  

   considered 
  a 
  conglomerate 
  except 
  in 
  some 
  cases 
  locally, 
  where 
  

   the 
  conglomeratic 
  portion 
  attains 
  a 
  thickness 
  of 
  two 
  or 
  three 
  feet 
  

   and 
  the 
  pebbles 
  are 
  relatively 
  close 
  together. 
  This, 
  however, 
  is 
  

   rarely 
  the 
  case 
  and 
  such 
  beds 
  soon 
  give 
  place 
  laterally 
  to 
  members 
  

   characterized 
  by 
  a 
  predominance 
  of 
  finer-grained 
  material. 
  The 
  

   thickness 
  of 
  the 
  series 
  in 
  Slide 
  mountain 
  is 
  13T5 
  feet, 
  but 
  it 
  

   thickens 
  considerable 
  to 
  the 
  westward 
  of 
  Hardenburgh 
  township, 
  

   where 
  it 
  is 
  not 
  less 
  than 
  1500 
  feet. 
  It 
  constitutes 
  the 
  upper 
  part 
  

   of 
  the 
  Wittemburgh 
  range 
  and 
  extends 
  nearly 
  to 
  the 
  edge 
  of 
  the 
  

   county 
  in 
  the 
  ridge 
  between 
  the 
  upper 
  Kondout 
  and 
  the 
  east 
  

   branch 
  of 
  the 
  Neversink. 
  Its 
  western 
  extension 
  was 
  not 
  carefully 
  

   studied, 
  but 
  the 
  same 
  characters 
  appear 
  to 
  persist 
  into 
  Delaware 
  

   county. 
  These 
  red 
  beds 
  are 
  cut 
  through 
  by 
  the 
  Neversink 
  and 
  its 
  

   branches, 
  by 
  the 
  headwaters 
  of 
  Big 
  Indian 
  creek, 
  and 
  their 
  divides, 
  

   by 
  Dry 
  brook, 
  Mill 
  brook 
  and 
  the 
  Beaver 
  kill 
  and 
  are 
  cut 
  off 
  by 
  

   Kondout 
  and 
  Esopus 
  creeks, 
  beyond 
  which 
  they 
  do 
  not 
  appear. 
  

  

  