﻿GEOLOGY 
  OF 
  THOUSAND 
  ISLANDS 
  REGION 
  1 
  73 
  

  

  Small 
  masses 
  of 
  barite 
  are 
  not 
  infrequent 
  in 
  -the 
  Grenville 
  lime- 
  

   stone, 
  but 
  none 
  were 
  seen 
  of 
  any 
  size 
  or 
  importance. 
  An 
  old 
  

   opening 
  was 
  made 
  on 
  a 
  coarsely 
  micaceous 
  limestone 
  contact 
  zone, 
  

   2 
  miles 
  north 
  of 
  Theresa, 
  but 
  no 
  mica 
  of 
  merchantable 
  size 
  and 
  qual- 
  

   ity 
  was 
  forthcoming. 
  

  

  The 
  only 
  mineral 
  industry 
  of 
  the 
  district 
  that 
  has 
  any 
  present 
  or 
  

   prospective 
  value 
  is 
  the 
  quarry 
  industry. 
  Stone 
  has 
  been 
  and 
  is 
  

   being 
  quarried 
  for 
  road 
  metal, 
  for 
  paving, 
  for 
  flagging, 
  for 
  lime, 
  

   and 
  for 
  construction. 
  Various 
  Precambric 
  rocks, 
  the 
  Potsdam 
  

   sandstone, 
  and 
  the 
  Pamelia, 
  Lowville 
  and 
  Black 
  River 
  limestones 
  

   have 
  all 
  been 
  quarried 
  in 
  varying 
  degree 
  for 
  one 
  or 
  the 
  other 
  of 
  

   these 
  purposes. 
  

  

  Road 
  metal 
  

  

  Road 
  improvement 
  is 
  going 
  on 
  hereabout, 
  as 
  elsewhere 
  in 
  the 
  

   State. 
  About 
  Theresa, 
  Grenville 
  limestone 
  has 
  been 
  chiefly 
  used, 
  

   though 
  a 
  small 
  quarry 
  has 
  been 
  opened 
  in 
  very 
  impure 
  limestone 
  

   cut 
  up 
  by 
  granite, 
  which 
  furnished 
  very 
  variable, 
  and 
  hence 
  not 
  

   very 
  good 
  material. 
  The 
  limestone 
  from 
  the 
  other 
  quarry 
  makes 
  a 
  

   very 
  good 
  macadamized 
  road, 
  as 
  would 
  apparently 
  much 
  of 
  the 
  

   Grenville 
  limestone 
  of 
  the 
  district. 
  

  

  About 
  Alexandria 
  bay 
  various 
  experiments 
  have 
  been 
  tried 
  with 
  

   road 
  metal. 
  The 
  Laurentian 
  granite 
  gneiss 
  of 
  the 
  vicinity 
  has 
  been 
  

   used, 
  and 
  of 
  course 
  given 
  poor 
  satisfaction. 
  To 
  a 
  small 
  extent 
  

   Pamelia 
  limestone 
  has 
  also 
  been 
  used, 
  and 
  has 
  not 
  proved 
  very 
  

   satisfactory, 
  probably 
  because 
  of 
  the 
  variability 
  of 
  the 
  different 
  

   layers 
  used, 
  pure 
  limestone 
  and 
  magnesian 
  limestone 
  probably 
  being 
  

   mixed 
  together. 
  At 
  present 
  a 
  considerable 
  stretch 
  of 
  road 
  north 
  

   of 
  Browns 
  Corners 
  is 
  being 
  macadamized 
  with 
  Grenville 
  amphib- 
  

   olite, 
  obtained 
  i 
  mile 
  west 
  of 
  Redwood, 
  surfaced 
  with 
  Grenville 
  

   limestone, 
  which, 
  as 
  we 
  saw 
  it 
  being 
  obtained, 
  was 
  of 
  poor 
  qual- 
  

   ity. 
  The 
  amphibolite 
  was 
  slightly 
  soaked 
  with, 
  and 
  cut 
  by 
  granite, 
  

   so 
  that 
  the 
  material 
  was 
  not 
  as 
  uniform 
  as 
  is 
  desirable, 
  but 
  the 
  

   quantity 
  of 
  granite 
  is 
  so 
  slight 
  that 
  the 
  lack 
  of 
  uniformity 
  is 
  not 
  

   prominent, 
  and 
  the 
  amphibolite 
  itself 
  is 
  quite 
  undecayed, 
  firm 
  and 
  

   strong. 
  It 
  seems 
  on 
  the 
  whole 
  likely 
  to 
  prove 
  quite 
  adaptable 
  to 
  

   road-making 
  purposes. 
  Its 
  composition 
  is 
  quite 
  similar 
  to 
  that 
  of 
  

   trap, 
  and 
  in 
  all 
  probability 
  it 
  will 
  bind 
  in 
  similar 
  fashion. 
  

  

  Potsdam 
  sandstone 
  has 
  been 
  used 
  as 
  a 
  road 
  rock 
  to 
  a 
  small 
  ex- 
  

   tent. 
  It 
  is 
  absolutely 
  unfitted 
  for 
  such 
  use, 
  and 
  the 
  worst 
  rock 
  that 
  

   could 
  be 
  selected 
  for 
  the 
  purpose. 
  

  

  