﻿22 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  strata 
  into 
  the 
  crystallines. 
  As 
  described 
  by 
  Darton 
  they 
  are 
  normal 
  

   faults 
  with 
  a 
  downthrow 
  to 
  the 
  east, 
  amounting 
  to 
  800 
  feet 
  in 
  the 
  

   Little 
  Falls 
  fault 
  and 
  to 
  1600 
  feet 
  in 
  that 
  at 
  Hoffman. 
  The 
  faults 
  

   cut 
  the 
  latest 
  of 
  the 
  stratified 
  rocks 
  represented, 
  the 
  Utica 
  shale. 
  

  

  An 
  earlier 
  period 
  of 
  faulting 
  occurred 
  in 
  Precambric 
  time, 
  though 
  

   the 
  displacements 
  can 
  be 
  distinguished 
  from 
  those 
  of 
  later 
  age 
  in 
  

   but 
  few 
  cases. 
  The 
  ore 
  bodies 
  on 
  Arnold 
  hill 
  have 
  been 
  broken 
  by 
  

   a 
  system 
  of 
  cross 
  faults, 
  and 
  along 
  some 
  of 
  these 
  diabase 
  dikes 
  have 
  

   been 
  intruded. 
  The 
  dikes 
  are, 
  as 
  already 
  stated, 
  of 
  late 
  Precambric 
  

   age. 
  As 
  they 
  show 
  no 
  effects 
  themselves 
  of 
  any 
  disturbance, 
  it 
  

   would 
  appear 
  that 
  the 
  displacements 
  occurred 
  before 
  their 
  intrusion. 
  

  

  