﻿456 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Of 
  these 
  the 
  Becraft 
  and 
  the 
  cement 
  beds 
  are 
  the 
  most 
  im- 
  

   portant. 
  

  

  Onondaga 
  limestone. 
  This 
  has 
  been 
  quarried 
  at 
  a 
  number 
  of 
  

   localities 
  for 
  burning 
  into 
  lime. 
  The 
  stone 
  is 
  generally 
  light 
  blue 
  

   gray, 
  dense 
  and 
  massive. 
  An 
  unfortunately 
  common 
  feature 
  is 
  

   the 
  presence 
  of 
  layers 
  of 
  chert 
  though 
  these 
  may 
  be 
  locally 
  absent 
  

   at 
  times. 
  It 
  predominates 
  chiefly 
  in 
  the 
  upper 
  beds. 
  

  

  Darfon 
  states 
  (p. 
  301) 
  that 
  the 
  outcrop 
  of 
  the 
  Onondaga 
  lime- 
  

   stone 
  is 
  practically 
  continuous 
  from 
  the 
  northeastern 
  corner 
  of 
  

   the 
  county 
  to 
  Wawarsing 
  township. 
  

  

  Around 
  Kingston 
  its 
  area 
  widens 
  greatly, 
  due 
  to 
  the 
  presence 
  

   of 
  folds, 
  and 
  most 
  of 
  the 
  upper 
  part 
  of 
  the 
  city 
  is 
  built 
  on 
  it. 
  

   Southward 
  by 
  Hurley 
  and 
  Marbletown 
  the 
  Onondaga 
  formation 
  

   is 
  prominent 
  in 
  the 
  ridge 
  sloping 
  westward 
  to 
  Esopus 
  creek. 
  

  

  Exposures 
  also 
  abound 
  along 
  the 
  W. 
  S. 
  R. 
  R. 
  northward 
  from 
  

   Kingston, 
  and, 
  from 
  west 
  of 
  Saugerties 
  to 
  Asbury, 
  along 
  and 
  near 
  

   the 
  road 
  passing 
  through 
  Cedar 
  Grove 
  and 
  Katsbaan. 
  

  

  Upper 
  shaly 
  limestone. 
  Throughout 
  its 
  whole 
  extent 
  the 
  upper 
  

   shaly 
  limestone 
  exhibits 
  a 
  large 
  amount 
  of 
  argillaceous 
  and 
  

   siliceous 
  impurities. 
  The 
  beds 
  are 
  massive 
  but 
  the 
  rocks 
  possess 
  

   a 
  slaty 
  cleavage 
  and 
  these 
  properties 
  aid 
  in 
  the 
  formation 
  by 
  them 
  

   of 
  small 
  rough 
  ridges. 
  

  

  It 
  extends 
  across 
  the 
  county 
  parallel 
  with 
  the 
  Onondaga 
  lime- 
  

   stone. 
  As 
  far 
  as 
  known 
  it 
  is 
  not 
  available 
  for 
  any 
  of 
  the 
  uses 
  

   treated 
  of 
  in 
  this 
  report. 
  The 
  upper 
  shaly 
  overlies 
  the 
  

  

  Becraft 
  limestone. 
  This 
  in 
  Ulster 
  co. 
  is 
  the 
  purest 
  limestone 
  

   of 
  the 
  whole 
  Lower 
  Helderberg 
  series. 
  The 
  beds 
  are 
  massive, 
  

   bluish 
  gray 
  to 
  reddish 
  limestone, 
  of 
  a 
  semi-crystalline 
  nature 
  and 
  

   highly 
  fossiliferous. 
  

  

  Scattered 
  through 
  the 
  rock 
  are 
  saucer-shaped 
  masses 
  of 
  white 
  

   crystallized 
  lime 
  carbonate, 
  from 
  one 
  to 
  two 
  inches 
  in 
  diameter 
  

   and 
  representing 
  the 
  bases 
  of 
  crinoid 
  heads. 
  The 
  formation 
  

   according 
  to 
  Darton 
  varies 
  from 
  20 
  to 
  30 
  feet. 
  

  

  Extensive 
  quarries 
  have 
  been 
  opened 
  in 
  it 
  near 
  Rondout, 
  Eddy- 
  

   ville 
  and 
  Whiteport. 
  The 
  lime 
  made 
  from 
  it 
  is 
  of 
  good 
  quality, 
  

   lumpy 
  but 
  slightly 
  brown 
  in 
  color. 
  The 
  Becraft 
  limestone 
  ex- 
  

  

  