﻿Plate 
  19 
  

  

  H. 
  P. 
  Cushing, 
  photo, 
  1910 
  

  

  Slickensided 
  shaly 
  material 
  on 
  Stark's 
  knob, 
  as 
  it 
  appeared 
  September 
  

   1, 
  1910. 
  The 
  position 
  of 
  the 
  exposure 
  is 
  shown 
  by 
  the 
  arrow 
  in 
  the 
  

   previous 
  plate. 
  

  

  