534 



A. M. BATEMAN KENNECOTT GLACIER OF ALASKA 



tion or grade occur. Where the grade steepens, marginal crevasses are 

 prevalent and appear to extend across about one-quarter the width of 

 the glacier. Some fourteen measurements of direction made on these 

 marginal crevasses show that they point upstream and form an angle of 

 50 degrees with the edge of the glacier. This figure is a mean of all 

 the measurements, but individual readings did not vary more than 

 six degrees from the mean. 



EDGES 



The edges of the glacier are marked by numerous embayments and 



projections. The embayments appear to be formed by more rapid melt- 



l'j<,l KF 5. 



Yarrow A-shaped Moraine parallel to Edge of Glacier and higher than Top 



of Glacier 



ing at certain places. They are usually half -moon shaped and may 

 reach three hundred yards in diameter. The smaller ones are often 

 filled by ponds of dirty glacier water. Small streamlets wind in and out 

 along the edges, but their length is not great, for they all disappear, 

 sooner or later, down into the glacier. 



Till is present everywhere along the edges (figure 4). In some places 

 it occurs in irregularly outlined hummocks or sporadic bunches or man- 

 tles; in others it is in the form of long moraines, A-shaped in cross- 

 section, resembling eskers in shape, and parallel to the edge of the 

 glacier (figure 5). These moraines are conspicuous topographic fea- 



