﻿450 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  In 
  this 
  latter 
  one 
  however 
  they 
  are 
  so 
  unimportant 
  as 
  not 
  to 
  be 
  

   worth 
  considering. 
  

  

  The 
  Cambrian 
  limestones 
  are 
  found 
  at 
  several 
  places 
  in 
  Orange 
  

   co. 
  One 
  area 
  occurs 
  around 
  Central 
  Valley 
  and 
  Turners 
  extend- 
  

   ing 
  thence 
  westward 
  to 
  Monroe. 
  It 
  is 
  finely 
  crystalline, 
  light 
  

   bluish 
  gray, 
  but 
  rather 
  siliceous. 
  It 
  is 
  however 
  used 
  for 
  lime. 
  

   Another 
  area 
  extends 
  from 
  a 
  point 
  about 
  two 
  miles 
  south 
  of 
  

   Sugar 
  Loaf 
  past 
  Stone 
  Bridge, 
  Warwick' 
  and 
  New 
  Milford 
  into 
  

   New 
  Jersey. 
  Its 
  character 
  ih»this 
  area 
  is 
  similar 
  to 
  that 
  around 
  

   Monroe 
  and 
  Turners. 
  It 
  may 
  at 
  times 
  become 
  quite 
  siliceous, 
  

   showing 
  as 
  much 
  as 
  18$ 
  silica, 
  and 
  there 
  may 
  also 
  be 
  a 
  varia- 
  

   tion 
  between 
  the 
  different 
  layers 
  in 
  the 
  same 
  quarry, 
  one 
  perhaps 
  

   containing 
  o'nly 
  2$, 
  while 
  the 
  others 
  may 
  have 
  15$ 
  or 
  18$. 
  

  

  An 
  area 
  of 
  white 
  limestone 
  extends 
  from 
  Florida 
  through 
  

   Pine 
  Island 
  and 
  Amity 
  into 
  New 
  Jersey. 
  This 
  is 
  highly 
  crys- 
  

   talline, 
  metamorphosed 
  Cambrian 
  limestone 
  which 
  also 
  under- 
  

   lies 
  a 
  broad 
  belt 
  which 
  extends 
  southwest 
  from 
  Florida 
  through 
  

   Big 
  Island 
  and 
  Gardinerville 
  to 
  New 
  Jersey. 
  It 
  possesses 
  the 
  

   same 
  character 
  as 
  the 
  other 
  belt. 
  Another 
  small 
  area 
  is 
  found 
  

   along 
  the 
  railroad 
  between 
  Neelytown 
  and 
  Campbell 
  Hall. 
  This 
  

   has 
  been 
  used 
  to 
  a 
  small 
  extent 
  for 
  lime. 
  The 
  Cambrian 
  lime- 
  

   stones 
  also 
  outcrop 
  both 
  southwest, 
  west 
  and 
  north 
  of 
  the 
  city 
  

  

  of 
  Newburgh. 
  

  

  Rockland 
  county 
  

  

  The 
  character 
  of 
  these 
  Calciferous 
  rocks 
  of 
  the 
  Orange 
  and 
  

   Rockland 
  county 
  belt 
  may 
  be 
  judged 
  from 
  the 
  following 
  analyses 
  

   made 
  of 
  samples 
  collected 
  from 
  different 
  parts 
  of 
  the 
  quarry, 
  the 
  

   analyses 
  in 
  each 
  case 
  representing 
  the 
  average 
  of 
  the 
  quarry. 
  

  

  The 
  first 
  one 
  of 
  the 
  magnesian 
  limestone 
  from 
  Tompkins 
  Cove 
  

   is 
  as 
  follows: 
  

  

  Oxid 
  of 
  lime 
  26.34 
  

  

  Magnesia 
  16 
  . 
  74 
  

  

  Carbonic 
  acid 
  39.10 
  

  

  Alumina 
  4 
  . 
  13 
  

  

  Ferric 
  oxid 
  1.0-5 
  

  

  Silica 
  12.00 
  

  

  99.36 
  

  

  