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9 2 _<br />
Plate 12<br />
A . Vein ice in fine textured till at a depth of 55 cm .<br />
content of this depth was found to be 58 percent on<br />
basis . Southwest side of the Wrigley Sheet .<br />
The ice<br />
a weight<br />
B .<br />
Perennially frozen<br />
fine textured till<br />
and gravel deposits .<br />
Fast mountain<br />
rivers undercut these<br />
frozen materials,<br />
thus contributing<br />
considerably to river<br />
bank erosion .<br />
Dahadinni River area .