﻿THE 



CANADIAN RECOED 



OF SCIENCE. 



VOL. VII. APRIL, 1897. No. 6. 



Notes on the Geology of the Admiralty Group 

 OF the Thousand Islands, Ontario. 



By Frank D. Adams, McGill University, Montreal. 



The Thousand Islands, lying in the Eiver St. Lawrence 

 near its exit from Lake Ontario, and which are so 

 well known as a summer resort, owe their origin to 

 the passage across the river here of a narrow arm of the 

 hard Laurentian rocks which form the great nucleus of 

 the North American continent, which arm nearly connects 

 the main part of the nucleus forming the Canadian 

 Highlands with the outlying area of these rocks in the 

 State of New York, known as the Adirondack Mountains. 



The islands, some 1,400 in number, naturally fall into 

 several groups, and that known as the Admiralty Group 

 includes about 150 rocks and islands of various sizes, 

 lying to the south-west of the town of Gananoque. 



The Canadian islands, having recently been offered for 

 sale pj the Government, have been surveyed and their 

 respective areas determined. The larger islands have 

 retained their names on the Government map, while the 

 smaller islands have been designated by numbers, corre- 



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