﻿362 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Black, 
  massive, 
  fine 
  grained 
  limestone. 
  In 
  floor 
  .of 
  

  

  quarry 
  3 
  feet 
  

  

  Dark 
  gray, 
  fine 
  grained 
  limestone 
  25 
  

  

  Black, 
  compact 
  limestones 
  with 
  slaty 
  layers 
  

  

  Trenton 
  limestone. 
  This 
  is 
  found 
  extending 
  up 
  the 
  Champlain 
  

   valley 
  with 
  a 
  thickness 
  of 
  230 
  feet. 
  It 
  overlies 
  the 
  Chazy. 
  There 
  

   are 
  also 
  extensive 
  outcrops 
  of 
  it 
  around 
  Hoosick 
  Falls 
  but 
  at 
  

   this 
  point 
  the 
  stone 
  is 
  apt 
  to 
  be 
  slaty. 
  

  

  Quarries 
  have 
  been 
  opened 
  up 
  in 
  the 
  Trenton 
  limestone 
  at 
  Isle 
  

   Lamotte, 
  Plattsburg, 
  Larabees 
  point 
  and 
  Fort 
  Frederick 
  on 
  

   Crown 
  point. 
  

  

  The 
  Trenton 
  rocks 
  also 
  extend 
  westward 
  along 
  the 
  Mohawk 
  

   valley 
  and 
  northward 
  to 
  Watertown. 
  They 
  are 
  quarried 
  at 
  

   Prospect, 
  Oneida, 
  Port 
  Leyden, 
  Boonville 
  and 
  Watertown. 
  The 
  

   Trenton 
  limestone 
  formation 
  is 
  dark 
  gray 
  to 
  black 
  and 
  is 
  often 
  

   fossiliferous. 
  

  

  The 
  central 
  part 
  of 
  the 
  Trenton 
  formation 
  is 
  apt 
  to 
  be 
  shaly 
  in 
  

   places 
  while 
  the 
  lower 
  member 
  known 
  as 
  the 
  Birdseye 
  limestone 
  

   is 
  massive 
  and 
  heavy 
  bedded. 
  The 
  upper 
  part 
  of 
  the 
  Trenton 
  

   formation 
  or 
  Trenton 
  limestone 
  proper 
  is 
  a 
  lighter 
  gray 
  lime- 
  

   stone 
  and 
  finely 
  crystalline 
  in 
  its 
  nature. 
  This 
  member 
  is 
  quar- 
  

   ried 
  at 
  Prospect. 
  

  

  Chazy 
  limestone. 
  The 
  Chazy 
  limestone 
  first 
  appears 
  at 
  Saratoga 
  

   and 
  extends 
  northward 
  along 
  the 
  Champlain 
  valley 
  to 
  Montreal. 
  

   The 
  area 
  is 
  probably 
  a 
  continuous 
  one 
  though 
  not 
  exposed 
  at 
  

   all 
  points. 
  The 
  most 
  prominent 
  exposures 
  of 
  the 
  Chazy 
  are 
  in 
  

   the 
  quarries 
  of 
  the 
  Chazy 
  marble 
  lime 
  co. 
  and 
  William 
  Coss, 
  and 
  

   at 
  Grand 
  Isle. 
  The 
  rock 
  is 
  a 
  gray, 
  isubcrystalline 
  limestone, 
  and 
  

   affords 
  an 
  excellent 
  lime. 
  The 
  average 
  thickness 
  of 
  the 
  forma- 
  

   tion 
  according 
  to 
  Brainerd 
  and 
  Seely 
  is 
  about 
  700 
  ft. 
  The 
  char- 
  

   acter 
  of 
  the 
  stone 
  is 
  quite 
  uniform. 
  Large 
  quarries 
  have 
  also 
  been 
  

   opened 
  in 
  the 
  Chazy 
  on 
  Willsboro 
  point, 
  Essex 
  co. 
  

  

  The 
  Chazy 
  limestone 
  is 
  not 
  found 
  in 
  the 
  Mohawk 
  valley 
  and 
  

   thins 
  out 
  in 
  the 
  central 
  and 
  western 
  part 
  of 
  the 
  state. 
  

  

  