GLACIATION OF W RAN CELL MOUNTAINS 45 



and extends to the ice-edge above Euchre Mountain. It is the only 

 continuous belt of moraine to be seen from this mountain. 



There is an almost complete absence of distinct terminal moraine 

 deposits, and it is concluded that the glacier is retreating. If this 

 is the case, however, the ice-movement must be very slow, for a com- 

 parison of the photographs taken by Rohn^ in 1899 with those taken 

 by the writer nine years later show surprisingly little change in the 

 aspect of the glacier. The moraines appear the same, and there are 

 only slight changes in the courses of the streams below the ice-edge. 

 At one place a slight recession has taken place in the edge of the 

 glacier. 



Small glaciers in the Chisana drainage basin. — ^There are a num- 

 ber of small glaciers which drain into the Chisana Valley. On the 

 east several little ice-lobes project down from the ice-field which caps 

 the mountains southeast of Euchre Mountain. These form the 

 heads of Bow and Gehoenda creeks. On the west, four small 

 glaciers drain into Cross Creek, two from the Wrangell Mountains 

 (Fig. i), and five from the Nutzotin Mountains into Notch Creek. 

 Mount Allen supports two little ice-tongues which drain into the 

 Chisana below the mouth of Cross Creek. 



Glacio-fluvial deposits. — ^The valley below Euchre Mountain con- 

 tains broad gravel bars built up by the streams from the glacier. 

 The stream-laid deposits differ notably, however, from those found 

 immediately below the Nabesna Glacier. Here coarse gravel is the 

 exception, and as far north as the mouths of Cross (Copper) and 

 Chavolda creeks, the bars are largely composed of fine gravels and 

 sands. The valley is wide and the stream breaks up into a multi- 

 tude of channels. On the afternoons of warm days, these channels 

 were observed to overflow and join until much of the wide flat was 

 covered by a thin sheet of water. 



Below the mouth of Cross Creek, the gravels become much coarser, 

 as this creek discharges coarse gravels. The valley through the Nut- 

 zotin Mountains is a narrow U-shaped gorge, and the waters flow in 

 a few large channels. Through the gorge there is shown the usual 

 succession of coarse gravels above, becoming progressively finer down 

 stream. 



I Oscar Rohn, 21st Ann. Kept., U. S. Geological Survey, Part II, PI. LV. 



