﻿PLATE 
  LXX.— 
  To 
  face 
  page 
  158. 
  

  

  ?:t^* 
  

  

  • 
  ^'X^^^. 
  

  

  

  

  iVVNKOOP 
  HALLENBECK 
  CRAWFORD 
  'CQ. 
  

  

  N. 
  H. 
  Darton, 
  photo. 
  

  

  Cliff 
  of 
  Lower 
  Pentamerus 
  Limestone, 
  Near 
  Indian 
  Ladder, 
  Albany 
  Co. 
  

  

  