﻿Report 
  of 
  the 
  State 
  Geologist. 
  705 
  

  

  concentration. 
  But 
  they 
  are 
  precisely 
  like 
  the 
  ores 
  under 
  con- 
  

   sideration 
  in 
  one 
  respect, 
  that 
  is 
  in 
  being 
  concentrated 
  upon 
  an 
  

   impervious 
  rock. 
  Moreover 
  this 
  is 
  usually 
  an 
  altered 
  igneous 
  

   rock, 
  diabase 
  or 
  diorite, 
  which 
  the 
  miners 
  call 
  "paint 
  rock." 
  

   Thus, 
  the 
  analogy 
  in 
  this 
  direction 
  is 
  quite 
  complete, 
  the 
  altered 
  

   diabase 
  or 
  "paint 
  rock" 
  corresponding 
  in 
  position 
  and 
  function 
  

   with 
  the 
  altered 
  granite 
  or 
  " 
  serpentine." 
  

  

  The 
  facts 
  in 
  regard 
  to 
  the 
  past 
  productiveness 
  of 
  this 
  region 
  

   having 
  been 
  given 
  by 
  Dr. 
  Smock,* 
  it 
  is 
  unnecessary 
  to 
  repeat 
  

   them 
  here. 
  As 
  already 
  stated, 
  the 
  mines 
  are 
  now 
  idle 
  and 
  their 
  

   future 
  depends 
  upon 
  so 
  many 
  conditions 
  that 
  it 
  would 
  be 
  useless 
  

   to 
  speculate 
  at 
  length 
  in 
  regard 
  to 
  it. 
  Of 
  course 
  the 
  recent 
  

   developments 
  of 
  the 
  great 
  iron 
  regions 
  of 
  the 
  West 
  and 
  South 
  

   has 
  a 
  tendency 
  to 
  check 
  the 
  working 
  of 
  the 
  more 
  limited 
  

   deposits. 
  And 
  yet 
  these 
  ores 
  have 
  long 
  enjoyed 
  an 
  excellent 
  

   reputation 
  as 
  helping 
  to 
  make 
  a 
  favorable 
  mixture 
  in 
  the 
  blast 
  

   furnace, 
  and 
  for 
  this 
  purpose 
  have 
  been 
  transported 
  considerable 
  

   distances. 
  In 
  view 
  of 
  these 
  facts, 
  and 
  as 
  the 
  ore 
  may 
  be 
  cheaply 
  

   mined, 
  it 
  is 
  very 
  probable 
  that 
  when 
  the 
  present 
  depression 
  in 
  

   the 
  iron 
  trade 
  is 
  over, 
  working 
  of 
  the 
  mines 
  will 
  be 
  resumed. 
  

  

  Talc. 
  

  

  Within 
  recent 
  years 
  an 
  importantindustry 
  has 
  developed, 
  based 
  

   upon 
  a 
  remarkable 
  series 
  of 
  talc 
  deposits, 
  which, 
  though 
  largely 
  

   outside 
  of 
  the 
  region 
  examined, 
  extends 
  into 
  its 
  southeastern 
  

   corner. 
  In 
  that 
  part 
  of 
  the 
  map 
  there 
  is 
  shown 
  a 
  belt 
  of 
  lime- 
  

   stone, 
  including 
  a 
  mass 
  of 
  gneiss 
  which 
  is 
  rich 
  in 
  hornblende 
  and 
  

   nearly 
  black. 
  This 
  belt 
  stretches 
  over 
  into 
  the 
  town 
  of 
  Edwards, 
  

   but 
  has 
  not 
  been 
  examined 
  in 
  that 
  portion. 
  The 
  appearance 
  of 
  

   the 
  limestone 
  is 
  quite 
  different 
  from 
  that 
  seen 
  in 
  the 
  larger 
  areas 
  

   to 
  the 
  north, 
  as 
  it 
  contains 
  abundant 
  thin 
  layers 
  of 
  a 
  fine-grained, 
  

   white 
  substance, 
  which 
  withstands 
  the 
  weather, 
  forming 
  project- 
  

   ing 
  edges. 
  At 
  the 
  same 
  time 
  the 
  limestone 
  often 
  appears 
  less 
  

   crystalline 
  than 
  that 
  seen 
  elsewhere. 
  The 
  composition 
  of 
  these 
  

   layers 
  has 
  not 
  been 
  thoroughly 
  investigated, 
  but 
  a 
  single 
  section 
  

   shows 
  tremolite 
  and 
  colorless 
  pyroxene 
  as 
  the 
  chief 
  constituents. 
  

   In 
  association 
  with 
  these 
  layers 
  thick 
  beds 
  of 
  quite 
  pure 
  talc 
  are 
  

   developed 
  upon 
  a 
  large 
  scale. 
  They 
  are 
  often 
  several 
  feet 
  in 
  

  

  * 
  J. 
  C. 
  Smock, 
  Bull. 
  N. 
  Y. 
  State 
  Museum, 
  No. 
  7, 
  pp. 
  44, 
  et 
  seq. 
  

   89 
  

  

  