﻿Plate 
  22 
  

  

  Falls 
  over 
  Canajoharie 
  (Trenton) 
  black 
  shale 
  south 
  of 
  Canajoharie, 
  Mont- 
  

   gomery 
  county. 
  

  

  Firm 
  N. 
  Y. 
  State 
  Mrs. 
  Bui. 
  19, 
  pi. 
  35 
  

  

  