﻿5° 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  together 
  with 
  the 
  fact 
  that 
  this 
  abrupt 
  change 
  in 
  slope 
  occurs 
  

   in 
  homogeneous 
  syenite 
  and 
  away 
  from 
  any 
  possible 
  stream 
  action, 
  

   makes 
  the 
  presence 
  of 
  a 
  fault 
  here 
  quite 
  certain. 
  

  

  The 
  eastern 
  face 
  of 
  Little 
  mountain 
  is 
  also 
  very 
  steep, 
  much 
  

   more 
  so 
  in 
  fact 
  than 
  the 
  contour 
  lines 
  indicate, 
  and 
  the 
  general 
  

   topographic 
  and 
  structural 
  relations 
  here 
  also 
  strongly 
  suggest 
  

   faulting. 
  Some 
  signs 
  of 
  shearing 
  were 
  noted. 
  The 
  northward 
  

   extension 
  of 
  this 
  fracture 
  (dotted 
  on 
  the 
  map) 
  is 
  more 
  doubtful 
  

   though 
  the 
  topography, 
  not 
  well 
  shown 
  on 
  the 
  map, 
  points 
  to 
  minor 
  

   faulting 
  there. 
  The 
  strike 
  of 
  these 
  two 
  last 
  named 
  faults 
  is 
  almost 
  

   exactly 
  at 
  right 
  angles 
  to 
  the 
  other 
  larger 
  faults 
  of 
  the 
  group. 
  

  

  Moose-No. 
  9 
  mountain 
  faults. 
  The 
  Moose 
  mountain 
  fault, 
  as 
  

   shown 
  on 
  the 
  map 
  south 
  of 
  Thurman 
  village, 
  is 
  really 
  only 
  the 
  

   northern 
  end 
  of 
  a 
  very 
  prominent 
  fault 
  which 
  has 
  formed 
  the 
  

   steep 
  escarpment 
  along 
  the 
  eastern 
  side 
  of 
  Moose 
  mountain 
  (Lu- 
  

   zerne 
  sheet). 
  

  

  No. 
  9 
  mountain 
  fault 
  strikes 
  due 
  north 
  and 
  south 
  and 
  has 
  caused 
  

   the 
  steep 
  western 
  front 
  of 
  the 
  mountain. 
  Some 
  evidence 
  of 
  shear- 
  

   ing 
  was 
  noted. 
  The 
  displacement 
  appears 
  to 
  have 
  been 
  no 
  less 
  than 
  

   500 
  feet, 
  and 
  the 
  eastward 
  downtilt 
  of 
  the 
  earth 
  block 
  is 
  evident. 
  

  

  Potter-Birch-Heath 
  mountain 
  faults. 
  The 
  Potter-Birch 
  moun- 
  

   tain 
  mass 
  is 
  a 
  fine 
  illustration 
  of 
  a 
  fault 
  block 
  with 
  steep 
  western 
  

   front 
  and 
  gradual 
  slope 
  away 
  from 
  the 
  scarp 
  toward 
  the 
  east. 
  On 
  

   the 
  western 
  side 
  of 
  Birch 
  mountain 
  there 
  is 
  a 
  very 
  distinct 
  shear 
  

   zone 
  along 
  which 
  the 
  syenite 
  has 
  been 
  badly 
  crushed 
  and 
  made 
  to 
  

   appear 
  much 
  like 
  a 
  biotite 
  schist. 
  The 
  Grenville, 
  mostly 
  lime- 
  

   stone, 
  dips 
  at 
  high 
  angles 
  eastward 
  sharply 
  against 
  the 
  syenite 
  

   along 
  the 
  fault. 
  The 
  very 
  distinct 
  curving 
  in 
  of 
  the 
  fault 
  against 
  

   the 
  syenite 
  mass 
  is 
  here 
  better 
  shown 
  than 
  for 
  any 
  other 
  fault 
  of 
  

   the 
  quadrangle. 
  The 
  steepest 
  portion 
  of 
  the 
  scarp 
  is 
  at 
  Daggett 
  

   pond 
  where 
  an 
  almost 
  precipitous 
  wall 
  of 
  syenite 
  rises 
  555 
  feet 
  

   above 
  the 
  pond. 
  Judging 
  by 
  the 
  present 
  topography, 
  the 
  displace- 
  

   ment 
  of 
  this 
  fault 
  ranges 
  from 
  300 
  to 
  600 
  feet, 
  being 
  greatest 
  at 
  

   Potter 
  mountain. 
  

  

  The 
  Heath 
  mountain 
  mass 
  is 
  a 
  good 
  illustration 
  of 
  a 
  small 
  fault 
  

   block 
  eastwardly 
  downtilted. 
  The 
  displacement 
  is 
  no 
  less 
  than 
  

   300 
  or 
  400 
  feet. 
  It 
  is 
  possible 
  that 
  this 
  fault 
  is 
  really 
  a 
  continua- 
  

   tion 
  of 
  the 
  Potter 
  mountain 
  fault, 
  though 
  it 
  is 
  more 
  than 
  likely 
  

   a 
  separate 
  fracture 
  as 
  shown 
  on 
  the 
  map. 
  

  

  The 
  small 
  mountain 
  of 
  syenite 
  lying 
  just 
  across 
  the 
  river 
  from 
  

   Heath 
  mountain 
  is 
  a 
  still 
  smaller 
  fault 
  block 
  much 
  like 
  that 
  of 
  

   Heath 
  mountain. 
  

  

  