and Birth of Lake Huron, 15 



Beyond Kirkfield, the survey was not carried, but from the 

 topography of the country and from the fragments of the 

 beaches, the position of the Algonquin Beach is approximately 

 that of the broken line on the map. The gravel ridge at 

 Burk's Falls is probably part of the beach, as the mean rate 

 of northern rise would represent its position near this point. 



For comparison with the Algonquin Beach, the positions 

 and the elevations of the two next higher beaches, east of 

 Lake Huron are given on the map, and the tables of elevations 

 are here added. Of next beach, at or near : 



i'eet above the Sea. 



Forest . 720 (Spencer.) 



Parkhill, east of ... 736 



Bavfield, east of 767 



Ripley 813 



Walkerton (terrace) 825 



Paisley (terrace)... 860 



Burgoyne (east of Southampton) ._ _. 876 



Rockford, north of _ __ 915 



c< 



North coast of Lake Simcoe (probably that) on 



the insular ridge north of Barrie ._ 910 " 



l = 



Of the second beach above the Algonquin, at or near : 



Watford 773 



Ailsa Craig _ 789 



Varna 845 ( + ) 



Walkerton i 944 



Chatsworth ._ 985 



A still higher beach has been surveyed for many miles, and 

 several fragments of even more elevated shores are now well 

 identified. Some of these upper beaches have been traced 

 over long distances, and have been found resting upon the 

 land north of Lake Erie, and even extending to the high 

 country between Lake Ontario and Georgian Bay. 



From the figures recorded in the three tables, it will be 

 found that the mean rate of warping in the Algonquin Beach, 

 from the southern end of the lake to near Southampton, is 

 1-33 feet per mile; of the next beach, between Parkhill and 

 Burgoyne, 1*5 feet ; and of the higher beach, between Wat- 

 ford and Walkerton, 1*71 feet. These rates of differential 

 uplift are reduced at their more southern extensions, but in- 

 creased to two feet, or somewhat more, at the more northern. 



After skirting the Indian Peninsula, the position of the 

 Algonquin Beach surrounding the head of Georgian Bay 

 is such that it can be triangulated, and hence the average 

 amount of uplift, as well as its direction can be obtained. 

 Accordingly, it is found that the uplift upon the more south- 



