10 
MUSEUM BULLETIN NO. 23. 
partly taken up by rapids above the direct fall which was nearly 
three-quarters of a mile below the head of the outlet channel. 
Pigeon-Buckhorn Lake Basins. 
In Pigeon-Buckhorn Lake basins, a raised shore-line, which 
is probably a correlative of the highest Algonquin shore-line, 
also occurs. Instrumental measurements of the altitude of this 
beach were secured at five localities as follows: 
Locality 
Altitude above 
sea-level, feet 
Pigeon lake: west side of Pigeon lake £ mile north of mouth 
of Bobcaygeon river, base of cut bluff . . 
829 
$ mile north of last, base of cut bluff . . . . 
833 
West side of Pigeon lake 1£ miles south of mouth of 
Bobcaygeon river, gravel beach ridge 
3 miles south of last, gravel spit 
819 
809 
Little Mud lake: at the northeast end of Little Mud lake, 
faint shore cutting. 
813 
No evidence was found of the existence of a shore-line above 
the present shore-line around the southern part of Pigeon 
lake or on Chemong lake and it is probable that the plane of the 
ancient water level passes beneath the present water level in 
the southern part of these basins, as it does in the southwestern 
part of Sturgeon Lake basin. The northern shores of these 
lakes are generally rocky and likely to afford little evidence of 
wave action. They have not been carefully examined. The 
beach is remarkably well developed, however, north of Bobcay- 
geon and there can be little doubt that it extends around the 
northern portion of the Pigeon-Buckhorn Lake basin. 
A strongly scoured, rock-floored channel at Bobcaygeon 
(Plate I) near the northeastern end of Sturgeon lake, affords 
evidence of powerful river action and marks the second fall in 
the ancient outlet channel. The present fall from Sturgeon to 
