﻿56 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Collins 
  brook 
  fault. 
  The 
  Collins 
  brook 
  fault 
  lies 
  nearly 
  parallel 
  to 
  

   the 
  Holcombville 
  fault 
  and 
  it 
  is 
  named 
  from 
  the 
  small 
  brook 
  which 
  

   follows 
  the 
  base 
  of 
  the 
  scarp 
  near 
  its 
  north 
  end. 
  It 
  is 
  clearly 
  

   marked 
  by 
  the 
  topography 
  for 
  a 
  distance 
  of 
  5 
  miles 
  between 
  the 
  

   Hudson 
  river 
  and 
  Mill 
  creek 
  near 
  Wevertown. 
  The 
  evidence 
  for 
  

   its 
  existence 
  is 
  threefold, 
  namely: 
  (1) 
  the 
  long, 
  regular 
  scarp 
  of 
  

   granite 
  whose 
  crest 
  is 
  lined 
  with 
  peaks 
  rising 
  from 
  300 
  to 
  600 
  

   feet 
  above 
  the 
  base 
  of 
  the 
  scarp; 
  (2) 
  the 
  long, 
  smooth 
  contact 
  of 
  

   the 
  Grenville 
  against 
  the 
  base 
  of 
  the 
  scarp; 
  and 
  (3) 
  the 
  distinctly 
  

   eastward 
  downslope 
  of 
  the 
  earth 
  block 
  away 
  from 
  the 
  crest 
  of 
  the 
  

   scarp. 
  

  

  Henderson 
  mountain 
  faults. 
  The 
  principal 
  fault 
  of 
  this 
  group 
  

   strikes 
  northeast-southwest 
  along 
  the 
  western 
  base 
  of 
  the 
  Hender- 
  

   son 
  mountain 
  mass. 
  Its 
  position 
  is 
  plainly 
  marked 
  by 
  the 
  topog- 
  

   raphy, 
  and 
  though 
  the 
  scarp 
  is 
  not 
  as 
  steep 
  as 
  usual, 
  it 
  is 
  neverthe- 
  

   less 
  very 
  prominent 
  and 
  straight 
  and 
  cuts 
  across 
  the 
  foliation 
  of 
  

   the 
  rocks 
  at 
  a 
  high 
  angle. 
  The 
  sharp 
  swing 
  of 
  the 
  Hudson 
  river 
  

   northeastward 
  for 
  i 
  l 
  / 
  2 
  miles 
  along 
  the 
  line 
  of 
  the 
  fault 
  has 
  

   been 
  determined 
  by 
  the 
  crushed 
  belt 
  of 
  weakness. 
  North 
  of 
  

   the 
  river 
  the 
  position 
  of 
  the 
  stream 
  which 
  flows 
  through 
  Bird 
  

   pond 
  has 
  also 
  been 
  determined 
  by 
  the 
  fault. 
  As 
  judged 
  by 
  the 
  

   height 
  of 
  the 
  scarp 
  at 
  the 
  south 
  end 
  and 
  also 
  at 
  the 
  base 
  of 
  Hender- 
  

   son 
  mountain, 
  the 
  displacement 
  is 
  fully 
  700 
  feet. 
  Where 
  the 
  fault 
  

   crosses 
  the 
  belt 
  of 
  mixed 
  gneisses 
  the 
  scarp 
  is 
  much 
  less 
  prominent 
  

   because 
  of 
  the 
  relative 
  weakness 
  of 
  the 
  rocks 
  there. 
  No 
  tilting 
  of 
  

   this 
  fault 
  block 
  is 
  noticeable. 
  This 
  fault 
  certainly 
  continues 
  for 
  some 
  

   3 
  miles 
  northward 
  into 
  the 
  Schroon 
  Lake 
  quadrangle 
  along 
  the 
  

   western 
  bases 
  of 
  Green 
  and 
  Pine 
  hills. 
  

  

  The 
  second 
  fault 
  of 
  this 
  group 
  strikes 
  almost 
  parallel 
  to 
  the 
  

   Henderson 
  mountain 
  fault 
  and 
  lies 
  at 
  the 
  eastern 
  foot 
  of 
  the 
  moun- 
  

   tain 
  whose 
  elevation 
  is 
  191 
  5 
  feet. 
  The 
  very 
  steep 
  side 
  of 
  this 
  

   mountain 
  rises 
  700 
  feet 
  and 
  is 
  another 
  good 
  example 
  of 
  a 
  fault 
  

   scarp 
  wholly 
  within 
  homogeneous 
  rock. 
  Where 
  the 
  fault 
  passes 
  

   into 
  the 
  area 
  of 
  weaker 
  mixed 
  gneisses 
  the 
  scarp 
  is 
  much 
  less 
  

   prominent. 
  

  

  The 
  third 
  fault 
  of 
  this 
  group 
  is 
  a 
  small 
  one 
  which 
  lies 
  south 
  

   of 
  Igerna 
  and 
  along 
  the 
  north 
  side 
  of 
  the 
  Hudson 
  river. 
  It 
  is 
  

   wholly 
  within 
  the 
  area 
  of 
  mixed 
  gneisses 
  but 
  at 
  some 
  places 
  almost 
  

   vertical 
  scarps 
  rise 
  fully 
  200 
  feet. 
  

  

  Schroon 
  lake 
  faults. 
  The 
  larger 
  of 
  the 
  two 
  faults 
  here 
  de- 
  

   scribed 
  strikes 
  northeast-southwest 
  and 
  extends 
  along 
  the 
  eastern 
  

  

  