﻿GEOLOGY 
  OF 
  THE 
  NORTH 
  CREEK 
  QUADRANGLE 
  53 
  

  

  strikes. 
  The 
  usual 
  evidences 
  prove 
  the 
  faulting, 
  the 
  eastward 
  

   downtilt 
  of 
  the 
  fault 
  block 
  being 
  especially 
  well 
  shown. 
  Neither 
  

   of 
  the 
  two 
  faults 
  just 
  described 
  has 
  a 
  maximum 
  displacement 
  of 
  

   more 
  than 
  a 
  few 
  hundred 
  feet. 
  

  

  Brant 
  lake 
  faults. 
  A 
  very 
  prominent 
  fault, 
  which 
  may 
  be 
  called 
  

   the 
  Brant 
  lake 
  fault, 
  passes 
  along 
  the 
  northern 
  side 
  of 
  the 
  lake 
  of 
  

   the 
  same 
  name 
  within 
  the 
  adjoining 
  Bolton 
  sheet. 
  The 
  lake 
  clearly 
  

   occupies 
  a 
  depression 
  at 
  the 
  base 
  of 
  this 
  fault 
  scarp. 
  Only 
  the 
  

   western 
  end 
  of 
  this 
  fault 
  comes 
  into 
  the 
  North 
  Creek 
  quadrangle 
  

   Where 
  it 
  passes 
  along 
  the 
  southern 
  base 
  of 
  the 
  mountain 
  at 
  the 
  

   village 
  of 
  Horicon. 
  It 
  can 
  not 
  be 
  traced 
  across 
  the 
  Schroon 
  river. 
  

   Near 
  the 
  village 
  of 
  Horicon 
  distinctly 
  sheared 
  and 
  slickensided 
  rock 
  

   may 
  be 
  seen 
  in 
  the 
  granite 
  quarry. 
  At 
  the 
  village 
  the 
  displacement 
  

   appears 
  to 
  be 
  no 
  less 
  than 
  400 
  or 
  500 
  feet. 
  

  

  On 
  the 
  south 
  side 
  of 
  the 
  narrow 
  valley 
  at 
  Horicon 
  a 
  smaller 
  

   fault, 
  parallel 
  to 
  the 
  larger 
  one, 
  is 
  clearly 
  indicated 
  by 
  a 
  crushed 
  

   zone 
  in 
  the 
  granitic 
  syenite. 
  The 
  eastward 
  extent 
  of 
  this 
  fault 
  is 
  

   not 
  known. 
  

  

  Chestertown 
  faults. 
  A 
  prominent 
  fault 
  with 
  northwest-south- 
  

   east 
  strike 
  lies 
  along 
  the 
  southwestern 
  base 
  of 
  Prospect 
  mountain 
  

   and 
  is 
  thought 
  to 
  be 
  continuous 
  with 
  the 
  fault 
  shown 
  on 
  the 
  map 
  

   just 
  east 
  of 
  Loon 
  lake. 
  These 
  two 
  are 
  certainly 
  exactly 
  in 
  line 
  

   and, 
  though 
  they 
  have 
  not 
  been 
  positively 
  connected, 
  they 
  will 
  be 
  

   regarded 
  as 
  parts 
  of 
  the 
  same 
  line 
  of 
  fracture. 
  At 
  the 
  Loon 
  lake 
  

   end 
  the 
  fault 
  shows 
  an 
  almost 
  vertical 
  scarp 
  300 
  feet 
  high 
  where 
  

   it 
  passes 
  along 
  the 
  western 
  border 
  of 
  the 
  gabbro 
  stock. 
  The 
  scarp 
  

   there 
  consists 
  of 
  badly 
  sheared 
  gabbro, 
  and 
  Grenville 
  limestone 
  

   dips 
  directly 
  against 
  the 
  base 
  of 
  the 
  scarp. 
  The 
  southwestern 
  side 
  

   of 
  Prospect 
  mountain 
  is 
  a 
  fine 
  example 
  of 
  a 
  high, 
  steep 
  fault 
  scarp 
  

   with 
  banded 
  Grenville 
  gneisses 
  dipping 
  eastward 
  against 
  the 
  base 
  of 
  

   the 
  mountain 
  which 
  consists 
  of 
  a 
  granitelike 
  mass 
  of 
  gneiss. 
  A 
  

   displacement 
  of 
  no 
  less 
  than 
  700 
  feet 
  is 
  shown 
  here. 
  The 
  southern 
  

   end 
  of 
  the 
  fault 
  is 
  marked 
  by 
  a 
  rather 
  steep 
  scarp 
  several 
  hundred 
  

   feet 
  high 
  and 
  in 
  the 
  homogeneous 
  granite 
  porphyry. 
  

  

  There 
  is 
  fairly 
  good 
  reason 
  to 
  think 
  that 
  another 
  fault 
  with 
  

   north-south 
  strike 
  passes 
  through 
  the 
  western 
  edge 
  of 
  the 
  village 
  of 
  

   Chestertown, 
  but 
  since 
  its 
  presence 
  is 
  not 
  certain 
  it 
  is 
  represented 
  

   on 
  the 
  map 
  by 
  a 
  broken 
  line. 
  The 
  fairly 
  prominent 
  scarp 
  which 
  

   forms 
  a 
  long 
  straight 
  boundary 
  between 
  the 
  Grenville 
  and 
  the 
  

   igneous 
  rocks 
  is 
  the 
  chief 
  evidence 
  for 
  considering 
  a 
  fault 
  here. 
  

   The 
  fault 
  plane 
  is 
  mostly 
  concealed 
  by 
  heavy 
  drift. 
  

  

  