GLACIATION OF WRANGELL MOUNTAINS 41 



down to the trunk valley. Of those on the east five drain into 

 Nikonda Creek, nine into Bond Creek, three into Camp Creek 

 (Fig. 3), at least one into Cooper Creek, and three into Stone Creek. 

 From the west, about ten glaciers drain into Jacksina Creek and one 

 into Platinum Creek. Almost all these are cliff glaciers of small 

 area, and are but the remnants of larger bodies of ice which formerly 

 occupied the valleys. 



Glacio-Jiuvial deposits. — The Nabesna Valley, from the terminal 

 moraines to the north base of the Nutzotin Mountains, is floored by 



Fig. 3. — Glacier at the head of Notch Creek, and small cliff glaciers on the walls 

 above. 



gravel beds. The bars are from one to three miles wide, and the river 

 anastamoses over much of this flat in periods of high water. Although 

 the current is swift, the stream is heavily loaded, and the flat is con- 

 stantly being built up by the outwash from the glacier. 



The stream fluctuates daily in volume in the summer season. 

 It is a well-recognized fact by travelers in this region that streams 

 which are not fordable in the afternoons of warm days can be easily 

 crossed on cold days, or in the early morning before the melting ice 

 has swelled the current. In times of high water the main channels 

 may locally deepen their beds. Large bowlders are moved, and can 

 often be heard bumping along the bottoms of the streams. At the 

 same time, the heavily burdened waters may be depositing rapidly 

 in the shallower and more sluggish channels. In the night time, 



