﻿ADIRONDACK 
  MAGNETIC 
  IRON 
  ORES 
  21 
  

  

  rocks. 
  The 
  principal 
  thrust 
  has 
  been 
  evidently 
  from 
  the 
  southeast 
  

   or 
  northwest. 
  From 
  the 
  fact 
  that 
  the 
  eastern 
  section 
  has 
  undergone 
  

   the 
  greatest 
  disturbance 
  from 
  its 
  influence, 
  the 
  direction 
  would 
  

   appear 
  to 
  be 
  from 
  the 
  southeast 
  rather 
  than 
  from 
  the 
  opposite 
  point. 
  

  

  The 
  iron 
  ore 
  deposits 
  afford 
  many 
  interesting 
  examples 
  of 
  flexure. 
  

   Originally 
  they 
  were 
  probably 
  straight 
  tabular 
  bodies 
  formed 
  

   previous 
  to 
  the 
  dynamism 
  that 
  has 
  affected 
  the 
  inclosing 
  rocks. 
  In 
  

   some 
  districts 
  they 
  have 
  been 
  very 
  little 
  disturbed, 
  either 
  along 
  the 
  

   strike 
  or 
  on 
  the 
  dip. 
  In 
  others 
  as 
  instanced 
  by 
  the 
  deposits 
  of 
  

   Essex 
  county, 
  they 
  have 
  been 
  flexed, 
  twisted 
  and 
  made 
  to 
  assume 
  

   the 
  most 
  intricate 
  shapes, 
  around 
  which 
  the 
  walls 
  have 
  been 
  closely 
  

   molded. 
  

  

  The 
  existence 
  of 
  faults 
  can 
  be 
  demonstrated 
  in 
  many 
  cases 
  where 
  

   the 
  conditions 
  are 
  favorable 
  for 
  their 
  detection, 
  that 
  is 
  in 
  areas 
  

   made 
  up 
  of 
  contrasted 
  formations, 
  and 
  their 
  presence 
  is 
  indicated 
  

   elsewhere 
  by 
  topographic 
  considerations. 
  The 
  probable 
  close 
  

   connection 
  between 
  the 
  present 
  surface 
  conformation 
  and 
  faulting 
  

   has 
  been 
  brought 
  out 
  more 
  specially 
  by 
  Professor 
  Kemp 
  in 
  his 
  work 
  

   in 
  Essex 
  county. 
  

  

  The 
  main 
  series 
  of 
  faults 
  has 
  a 
  northerly 
  trend, 
  varying 
  from 
  

   nearly 
  due 
  north 
  to 
  northeast. 
  It 
  approximately 
  parallels 
  the 
  

   longer 
  axes 
  of 
  the 
  ridges 
  and 
  tends 
  to 
  produce 
  steep 
  faces 
  on 
  the 
  

   northwest 
  and 
  southeast 
  sides. 
  This 
  faulting 
  may 
  have 
  been 
  

   responsible 
  to 
  some 
  extent 
  for 
  the 
  markedly 
  uniform 
  trend 
  of 
  the 
  

   ridges 
  and 
  valleys. 
  In 
  some 
  cases 
  the 
  latter 
  appear 
  to 
  occupy 
  a 
  

   depressed 
  strip 
  between 
  two 
  parallel 
  faults 
  of 
  this 
  character. 
  

  

  A 
  second 
  series 
  of 
  faults, 
  which 
  has 
  probably 
  resulted 
  from 
  the 
  

   movements 
  initiated 
  by 
  the 
  main 
  series, 
  trends 
  away 
  at 
  varia- 
  

   ble 
  angles, 
  so 
  that 
  the 
  ridges 
  are 
  divided 
  into 
  irregular 
  blocks. 
  

   Examples 
  of 
  such 
  block 
  faulting 
  in 
  which 
  the 
  displaced 
  portions 
  

   are 
  more 
  or 
  less 
  tilted 
  form 
  a 
  characteristic 
  feature 
  of 
  the 
  interior 
  

   Adirondacks. 
  

  

  The 
  eastern 
  and 
  southern 
  margins 
  of 
  the 
  region 
  have 
  been 
  

   extensively 
  faulted. 
  In 
  Clinton 
  county 
  Cushing 
  has 
  found 
  the 
  

   Paleozoic 
  strata 
  to 
  be 
  frequently 
  displaced 
  by 
  meridional 
  faults, 
  of 
  

   which 
  one 
  in 
  Chazy 
  township 
  along 
  Tracy 
  brook 
  has 
  a 
  throw 
  of 
  at 
  

   least 
  2000 
  feet, 
  and 
  cuts 
  out 
  the 
  entire 
  Beekmantown 
  formation. 
  

   Most 
  of 
  the 
  faults 
  in 
  this 
  section 
  downthrow 
  to 
  the 
  east. 
  It 
  would 
  

   appear 
  that 
  the 
  New 
  York 
  shore 
  of 
  the 
  lower 
  part 
  of 
  Lake 
  Cham- 
  

   plain 
  is 
  limited 
  by 
  a 
  series 
  of 
  meridional 
  breaks 
  forming 
  a 
  basin 
  

   tilted 
  to 
  the 
  west. 
  North 
  of 
  the 
  Mohawk 
  valley 
  there 
  are 
  a 
  number 
  

   of 
  displacements 
  trending 
  northeast 
  across 
  the 
  dip 
  of 
  the 
  Paleozoic 
  

  

  