'280 J. W. GOLDTHWAIT^ A7.G0^'QT IX AND TROQTJOIB BEACHES 



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Figure 1. — Mav of Lakes Algonquin and Iroquois 



A short time previous to tlie date of construction of the Algonquin beach. (After 



Gilbert) 



Figure 2. — Map of Lake Algonquin 



At the stage marked by the Algonquin beach. The existence of Lake Iroquois at this 

 time is doubtful. The position of the ice border is quite -hypothetical 



