﻿PLATE 
  LXYIII.— 
  To 
  face 
  page 
  158. 
  

  

  N. 
  H, 
  Darton, 
  photo. 
  

  

  Sink 
  in 
  the 
  Lower 
  Helderberg 
  Limestone 
  West 
  of 
  Coxsackie, 
  Greene 
  Co. 
  

  

  