﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  

  

  129 
  

  

  1000 
  to 
  1500 
  feet 
  increasing 
  to 
  the 
  southeast 
  in 
  the 
  direction 
  of 
  

   the 
  interior 
  uplifts. 
  Though 
  the 
  contours 
  are 
  generally 
  rugged, 
  

   due 
  to 
  succeeding 
  lines 
  of 
  ridges, 
  there 
  are 
  few 
  notable 
  prominences 
  

   and 
  the 
  hills 
  rise 
  scarcely 
  more 
  than 
  500 
  feet 
  above 
  the 
  valley 
  

   bottoms. 
  

  

  Fig. 
  21 
  Sketch 
  map 
  of 
  the 
  St 
  Lawrence 
  county 
  magnetite 
  deposits. 
  Ore 
  bodies 
  shown 
  by- 
  

   heavy 
  lines 
  

  

  ^The 
  geology 
  of 
  this 
  part 
  of 
  the 
  Adirondacks 
  has 
  been 
  investi- 
  

   gated 
  only 
  in 
  its 
  broad 
  features. 
  No 
  maps 
  adequate 
  for 
  a 
  detailed 
  

   survey 
  are 
  available, 
  and 
  until 
  they 
  are 
  forthcoming 
  a 
  systematic 
  

   investigation 
  must 
  necessarily 
  be 
  postponed. 
  It 
  is 
  to 
  the 
  recon- 
  

   naissance 
  carried 
  out 
  during 
  recent 
  years 
  by 
  C. 
  H. 
  Smyth 
  jr, 
  that 
  

  

  