Great Lakes, and their Deformation. 203 



some of the beaches had been used as roads since the days of 

 Indian habitation. But in Ohio, more or less work had been 

 done, which will be referred to in its proper place. Upon 

 both sides of the St. Clair River, a succession of beaches may 

 be seen, in ascending inland over the slowly rising plains. 

 The beaches are of the same character as those described in 

 the author's earlier papers upon ancient shores. But they 

 appear to represent a rather shorter time in formation than the 

 Iroquois and Algonquin Beaches. 



The Foeest Beach. — Upon the Canadian side of the St. 

 Clair River, the first important deserted shore line, above the 

 Algonquin Beach, may be seen at Forest — and hence I will 

 name it the Forest Beach. This has been explored in both 

 directions from Forest, as shown on the map, with elevations 

 as in the table — these being instrnmentally levelled. 



Feet above the Sea. 



Lake Huron 582 



Forest 720 



East of Parkhill 736 . 



Xear Bayfield 767 



Ripley 813 



Walkerton (terrace in valley) _ . , _ . 825 



Paisley (terrace in valley) _ 860 



East of Burgoyne 876 



Rockford (spit across valley) 915 



Barrie (on insular ridge) 910 



East of Rockford the country is not favorable for the identi- 

 fication of the old beaches, as they were interrupted by the 

 promontory of Blue Mountains extending into the former sheet 

 of water, but on it various rock-terrace shore-lines are 

 engraved. On the drift hills farther eastward, ridges reappear 

 at elevations above the Algonquin Beach, which would point 

 to their identification with the Forest Beach. In this north- 

 eastward direction our survey was discontinued. 



From Forest, the beach has been explored, upon the northern 

 side of Lake Erie, and the equivalent terraces traced to north 

 of Lake Ontario. The measured elevation at various points 

 are : 



Feet above the Sea. 



Komoko (terrace in valley) 722 



White's Station (south of London) 715 



Xear Waterford 770 



Brantf ord 805 



Pushlinch Church (rock-terrace) 840 



Georgetown (terrace) 891 



Mono Road (terrace) . _ 930 



North of Stouffville (terrace) 1025 



