﻿Plate 2 



Road metal quarry in Grenville limestone at Theresa near the falls. 

 The limestone bed is a thin one in the general schist series and the quarry- 

 face is down the dip, here 75°. At the upper part of the cliff is Potsdam 

 sandstone with irregular contact with the limestone, and showing one of 

 the depressed pockets characteristic of these contacts, filled with weakly- 

 cemented calcareous sandstone. H. P. dishing, photo, 1907 



