﻿No. 
  30.] 
  

  

  87 
  

  

  State 
  proved 
  a 
  valuable 
  repository 
  for 
  metals, 
  and 
  the 
  workings 
  

   will 
  doubtless 
  be 
  shortly 
  abandoned. 
  The 
  ore 
  is 
  associated 
  with 
  

   quartz^ 
  (No. 
  44,) 
  carbonate 
  of 
  lime 
  in 
  crystals 
  and 
  incrustrations 
  

   upon 
  other 
  minerals, 
  (No. 
  45) 
  and 
  a 
  reddish 
  hrown 
  calcareous 
  spar 
  ^ 
  

   (No. 
  46) 
  which 
  presents 
  curved 
  and 
  broken 
  surfaces 
  on 
  cleavage. 
  

  

  The 
  white 
  limestone 
  which 
  furnishes 
  this 
  ore, 
  is 
  overlaid 
  at 
  

   this 
  locality 
  with 
  Potsdam 
  sandstone, 
  thus 
  furnishing 
  one 
  in- 
  

   stance 
  in 
  addition 
  to 
  the 
  many 
  I 
  have 
  observed 
  in 
  this 
  vicinity, 
  pro- 
  

   ving 
  at 
  least 
  the 
  relative 
  age 
  of 
  the 
  two 
  formations, 
  although 
  it 
  af- 
  

   fords 
  no 
  criterion 
  by 
  which 
  to 
  decide 
  the 
  disputed 
  question 
  of 
  

   their 
  origin. 
  

  

  As 
  the 
  relation 
  of 
  the 
  rocks 
  and 
  the 
  ore 
  is 
  somewhat 
  interest- 
  

   ing, 
  I 
  insert 
  a 
  figure 
  to 
  represent 
  them. 
  

  

  REFERENXES. 
  

  

  a. 
  Soil. 
  6. 
  Potsdam 
  sandstone. 
  

   c. 
  White 
  limestone. 
  

  

  