﻿LIMESTONE 
  

   AND 
  BLACK 
  SCHIST^ 
  

  

  POTSDAM 
  SAND 
  

   SCALE 
  Or 
  MILES 
  >. 
  

  

  — 
  5 
  ' 
  i 
  ' 
  1 
  ' 
  I 
  

  

  