﻿Plate 10 



Upper view. Contact of Potsdam sandstone on Grenville limestone just 

 north of lower bridge at Theresa, near the point at which plate n was 

 taken. The Potsdam base rests against the side of a limestone hill, and 

 the boy is seated on the limestone, with his hand resting on a portion of 

 the Potsdam base from which the limestone has been removed. 



Lower view. Nearer view of a portion of plate 9 showing the rotted 

 limestone and the portion of the Potsdam base which projects out beyond 

 it owing to removal of the limestone. H. N. Eaton, photo, 1908 



