﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  491 
  

  

  Along 
  the 
  river 
  terraces 
  and 
  in 
  the 
  larger 
  valleys 
  there 
  are 
  

   extensive 
  areas 
  of 
  clay 
  and 
  sands, 
  and 
  in 
  nearly 
  every 
  part 
  of 
  

   the 
  county 
  there 
  are 
  accumulations 
  of 
  drift 
  gravels 
  and 
  sands 
  of 
  

   greater 
  or 
  less 
  extent. 
  

  

  Stbatigeaphy. 
  

   The 
  rocks 
  of 
  Ulster 
  county 
  comprise 
  formations 
  from 
  lower 
  

   Silurian 
  to 
  upper 
  Devonian 
  age 
  lying 
  in 
  two 
  comformable 
  suc- 
  

   cessions 
  separated 
  by 
  an 
  unconformity 
  at 
  the 
  top 
  of 
  the 
  lower 
  

   Silurian. 
  These 
  members, 
  with 
  their 
  ages, 
  thickness 
  and 
  gen- 
  

   eral 
  characteristics, 
  are 
  listed 
  in 
  their 
  regular 
  succession 
  in 
  the 
  

   following 
  table 
  : 
  

  

  NAMES. 
  

  

  Upper 
  Flag 
  series. 
  

   Lower 
  Flag 
  series. 
  

  

  Hamilton 
  shales 
  ) 
  

  

  Onondaga 
  limestone 
  . 
  . 
  . 
  . 
  

  

  E8opus 
  shales 
  

  

  L 
  Oriskany 
  sandstone 
  

  

  Upper 
  shaly 
  limestone 
  1 
  

  

  I 
  Becraf 
  t 
  limestone 
  | 
  

  

  I 
  Lower 
  shaJy 
  limestone 
  } 
  

   I 
  Pentamerus 
  limestone. 
  I 
  

   J 
  Tentaculite 
  limestone.. 
  J 
  

  

  | 
  Cement 
  series 
  

  

  I 
  Niagara 
  limestone 
  

  

  I 
  Ciinton 
  arid 
  Medina 
  

  

  Shawangunk 
  grit 
  

  

  I 
  Hudson 
  River 
  formation 
  

   l.Wappinger 
  limestone 
  . 
  . 
  . 
  

  

  Age. 
  

  

  CatskUl.. 
  

  

  Chemung 
  

  

  Oneonta 
  (Port- 
  

   age) 
  

  

  Hamilton 
  < 
  

  

  Onondaga 
  

  

  Caudi-galli;grit. 
  

   Oriskany 
  

  

  r 
  

  

  Helderherg. 
  . 
  . 
  -j 
  

  

  Salina 
  

  

  Niagara 
  

  

  Clinton-Medina. 
  

  

  Oneida 
  

  

  Hudson 
  River 
  . 
  . 
  

   Calciferous 
  .... 
  

  

  Character. 
  

  

  White 
  conglomeratic 
  sandstones 
  

  

  Red 
  conglomeratic 
  sandstones 
  

  

  Gray 
  sandstones 
  and 
  flags, 
  with 
  red 
  ( 
  

   shales 
  { 
  

  

  Gray 
  sandstones 
  and 
  flags, 
  with 
  black 
  

   shales 
  

  

  Black 
  shales, 
  with 
  thin 
  sandstones 
  

  

  Gray 
  cherty 
  limestone 
  , 
  

  

  Black 
  slaty 
  shales 
  

  

  Calcareous 
  sandstones 
  and 
  conglome- 
  

   rate 
  

  

  Impure 
  limestone 
  

  

  Limestone 
  

  

  Impure 
  limestone 
  

  

  Dark 
  massive 
  limestones. 
  

  

  Thin-bedded 
  limestones 
  

  

  Cement 
  and 
  waterhme 
  

  

  Coralline 
  limestone 
  

  

  Red 
  shales, 
  sandstones 
  and 
  quartzites. 
  

  

  Conglomerate 
  . 
  

  

  Black 
  shales 
  and 
  sandstone 
  

  

  Limestone 
  

  

  Thick- 
  

  

  350+ 
  

  

  1375+ 
  

  

  3000+ 
  

  

  500 
  

  

  600 
  

  

  60 
  

   200-300 
  

  

  5-30 
  

  

  30-125 
  

  

  20-30 
  

  

  60 
  

  

  30-60 
  

  

  20-40 
  

  

  50-50 
  

  

  0-8 
  

  

  0-45 
  

  

  0-250 
  

  

  1800+ 
  

  

  200+ 
  

  

  White 
  conglomeratic 
  sandstone. 
  — 
  This 
  formation 
  caps 
  Slide 
  

   mountain 
  and 
  the 
  summits 
  of 
  some 
  adjacent 
  peaks. 
  It 
  is 
  a 
  

   coarse-grained, 
  heavily-bedded, 
  moderately 
  -hard 
  sandstone 
  con- 
  

   taining 
  disseminated 
  pebbles 
  and 
  conglomeratic 
  streaks. 
  The 
  

   pebbles 
  are 
  of 
  quartz 
  and 
  quartzite 
  in 
  greater 
  part, 
  of 
  light 
  color 
  

   and 
  small 
  size. 
  Its 
  greatest 
  thickness 
  is 
  seen 
  on 
  Slide 
  mountain, 
  

   where 
  there 
  are 
  350 
  feet 
  ; 
  the 
  outliers 
  or 
  adjacent 
  summits 
  are 
  

   very 
  much 
  less 
  in 
  thickness. 
  The 
  colors 
  are 
  in 
  greater 
  part 
  very 
  

   light 
  gray, 
  but 
  some 
  portions 
  are 
  greenish 
  or 
  brownish, 
  particu- 
  

   larly 
  toward 
  the 
  base 
  of 
  the 
  formation. 
  There 
  are 
  several 
  

   intercalated 
  beds 
  of 
  somewhat 
  finer-grained 
  sandstones. 
  The 
  

   pebbles 
  and 
  conglomeratic 
  streaks 
  are 
  of 
  very 
  irregular 
  occur- 
  

  

  