﻿202 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Upper 
  Helderberg 
  limestones 
  

  

  The 
  Upper 
  Helderberg 
  formation 
  appears 
  in 
  the 
  Hudson 
  valley 
  

   at 
  Kingsiton; 
  thence 
  it 
  runs 
  in 
  a 
  'belt 
  west 
  of 
  the 
  river, 
  to 
  the 
  

   Helderberg 
  mountains, 
  bending 
  to 
  the 
  west-noirthwest, 
  and 
  thence 
  

   west 
  it 
  continues 
  across 
  the 
  state 
  to 
  the 
  Niagara 
  river 
  and 
  Lake 
  

   Eirie. 
  The 
  subdivisions 
  are 
  known 
  as 
  the 
  Onondaga, 
  the 
  Oor- 
  

   nifero'Uis 
  and 
  the 
  Seneca 
  limestones. 
  The 
  first 
  is 
  more 
  generally 
  

   recognized 
  as 
  the 
  ^ 
  Onondaga 
  gray 
  limestone 
  ^ 
  and 
  the 
  last 
  as 
  the 
  

   Seneca 
  blue 
  limestone. 
  

  

  There 
  is 
  much 
  diversity 
  in 
  the 
  limestones 
  of 
  this 
  group 
  in 
  its 
  

   long 
  range 
  of 
  outcrop. 
  The 
  Onondaga 
  gray 
  stone 
  is 
  gray 
  in 
  

   color, 
  coarse 
  crystalline; 
  and 
  makes 
  beautiful 
  ashlar 
  work, 
  either 
  

   as 
  rock 
  face 
  or 
  as 
  fine 
  tooled, 
  decorative 
  pieces. 
  

  

  The 
  Oorniferous 
  limestone 
  is 
  hard 
  and 
  durable, 
  but 
  it 
  is 
  so 
  full 
  

   of 
  chert 
  that 
  it 
  can 
  only 
  be 
  used 
  for 
  common 
  wall 
  work. 
  

  

  The 
  Seneca 
  blue 
  limestone 
  is 
  easily 
  dressed 
  and 
  is 
  a 
  fairly 
  good 
  

   building 
  stone. 
  

  

  Limestone 
  of 
  the 
  Upper 
  Helderberg 
  epoch 
  is 
  quarried 
  exten- 
  

   sively 
  at 
  Kingston, 
  Ulster 
  county, 
  and 
  is 
  a 
  valuable 
  building 
  

   stone. 
  In 
  Onondaga 
  county 
  there 
  are 
  the 
  well-known 
  Splitrock 
  

   and 
  Reservation 
  groups 
  of 
  quarries, 
  which 
  have 
  produced 
  an 
  im- 
  

   mense 
  quantity 
  of 
  excellent 
  and 
  beautiful 
  stone 
  and 
  which 
  has 
  

   found 
  a 
  market 
  in 
  all 
  of 
  the 
  central 
  part 
  of 
  the 
  state. 
  They 
  are 
  

   in 
  the 
  lower 
  member 
  of 
  the 
  group. 
  Going 
  west, 
  there 
  are 
  the 
  

   large 
  quarries 
  in 
  the 
  Seneca 
  limestone 
  at 
  Union 
  Springs, 
  

   Waterloo, 
  Seneca 
  Falls 
  and 
  Auburn. 
  The 
  LeRoy, 
  Williamsville, 
  

   Buffalo 
  and 
  Black 
  Rock 
  quarries 
  are 
  in 
  the 
  Oorniferous 
  lime- 
  

   stone. 
  

  

  The 
  aggregate 
  output 
  of 
  the 
  quarries 
  in 
  the 
  Upper 
  Helderberg 
  

   limestones 
  exceeds 
  in 
  value 
  that 
  of 
  any 
  other 
  limestone 
  formation 
  

   in 
  the 
  state. 
  The 
  many 
  quarries 
  of 
  the 
  Trenton 
  probably 
  pro- 
  

   duce 
  more 
  stone. 
  

  

  Tully 
  limestone 
  

  

  The 
  Tully 
  limestone 
  lying 
  above 
  the 
  Hamilton 
  shales, 
  is 
  a 
  thin 
  

   formation 
  which 
  is 
  seen 
  in 
  Onondaga 
  county 
  and 
  to 
  the 
  west 
  — 
  

  

  