8 
MUSEUM BULLETIN NO. 23. 
Algonquin beach extends eastward past Kirkfield and formed an 
embayment in the Balsam Lake and Cameron Lake basins. At 
Fenelon Falls, however, a fall occurred and this point marks the 
beginning of the Trent Valley outlet channel of Lake Algonquin. 
It is known that the highest Algonquin beach south of the 
Trent Valley outlet isobase is a record of a “two outlet” stage of 
Lake Algonquin when the discharge was divided between the 
St. Clair outlet and the Trent Valley outlet . 1 It is probable, 
as Gilbert 2 and Taylor 5 concluded, that the highest Algonquin 
beach north of the Trent Valley outlet isobase is a record of an 
early stage of Lake Algonquin before “the outlet was diverted by 
terrestrial deformation” from the Trent valley to Port Huron, 
so that the continuation of this beach south of the Trent Valley 
outlet isobase would fall below the highest Algonquin beach in 
that region. In Lake Simcoe district, however, the highest 
beach appears to be equally well developed both north and 
south of the outlet isobase and the distance is so short that, prob- 
ably, no serious error is involved in correlating the highest beach 
north of the outlet isobase with that south of it. 
Sturgeon Lake Basin . 
In Sturgeon Lake basin, which is connected with Balsam 
and Cameron Lake basins by a short stretch of river, a strong 
raised beach occurs. The beach is considered to be a correlative 
of the highest Algonquin beach because of the connecting channel 
at Fenelon Falls and because the beach is remarkably strong and is 
not horizontal but shows approximately the same amount of 
deformation that is shown by the Algonquin beach. Instru- 
mental measurements of the altitude of this beach were secured 
at a number of localities as follows : 
* Goldthwait, J. W., Geol. Surv., Can., Mem. 10, 1910, p. 15. 
* Gilbert, G. K., “The Algonquin river” (Abstract), Am. Geol., vol. 18, p. 23 . 
* Taylor, F. B., U.S. Geol. Surv., Mon. LIII, 1915, pp. 412-413. 
