LAKE ALGONQUIN. 
9 
Locality 
Altitude above 
sea-level, feet 
Sturgeon lake: west side of Sturgeon lake, 1 mile south of 
Fenelon Falls, gravel beach ridge . . . 
832 
i mile south of last, gravel beach ridge ................ 
831 
miles south of last, gravel bar . .................... 
826 
2 \ miles south of last, gravel beach 
820 
East side of Sturgeon lake, 3J miles south of Fenelon 
Falls, gravel beach ridge. 
824 
North side of Sturgeon lake, f mile east of Sturgeon 
point, gravel beach ridge ... . . 
824 
2 J miles northeast of last, gravel spit ................ 
829 
1 mile east of Red Rock post-office, gravel spit, ... . . . 
833 
1 mile west of Bobcaygeon, base of cut bluff . , , . 
830 
South side of Sturgeon lake, opposite Sturgeon point, 
gravel beach ridge. . . 
819 
1 mile east of last, gravel beach ridge 
819 
Near the entrance to the bay in the southwestern part of 
the lake the ancient beach nearly coincides with the present 
beach and in the southern part of the bay the plane of the ancient 
water level apparently passes beneath the present water level. 
These altitudes show that the abandoned beach in Sturgeon Lake 
basin is on a distinctly lower plane than that of the highest 
Algonquin beach in the adjacent Cameron and Balsam Lake 
basins. The connecting outlet channel at Fenelon Falls is 
nearly a mile wide and is in large part rock floored. The bared 
rock floor and undercut banks on the valley sides show evidence 
of strong river action. The present river has a fall of 23 feet over 
a sill of Trenton limestone and it is evident that the ancient 
Algonquin river also had a considerable fall at this point. It is 
impossible to directly measure the height of the ancient fall 
but it can be arrived at approximately by taking the difference 
in altitude of the correlative beaches, at the nearest points 
above and below the fall, and subtracting the amount of uplift. 
This gives approximately 30 feet for the total fall in the ancient 
outlet channel at Fenelon Falls. The total fall was probably 
