1907-8.] THE GEOLOGY OF THE LAKE WENDIGOKAN REGION. 343 
the river to Lake Corrigan begins on comparatively low sand plains, but 
rises in crossing this same mass to about 1,100 feet above the sea and 200 
feet above the foot of the long rapids, and then descends to Lake Corri- 
gan, which has an elevation of about 1,020 feet above the sea-level. To 
First Falls on the Sturgeon River. 
the north of this lake a large hill of conglomerate rises about 250 feet 
above its surface. 
Between Lakes Corrigan and Wendigokan there is no great difference 
in level, though the portage between Wendigokan and the small lake to 
the west on the portage route crosses a divide. The water flows from 
this small lake to Corrigan and from there a short distance northwest 
to the Sturgeon, while the creek leaving the northeast bay of Wendigokan 
flows northward and westward, but reaches the river much higher up- 
stream than the outlet of the-other creek. Between Clear Lake and 
Wendigokan there is only about twelve feet difference in elevation, and 
Clear Creek flows over sand and gravel, which circumstance, combined 
with the fact that it has its origin in lakes lying in the same material, 
makes its water remarkably clear. 
