GLACr.lL GF.OLOGY OF XORTIf GREENLAND 8oi 



bed over which the up[^er ice passes. It is not possible to say 

 that its motion is absolutely lost, but many phenomena seem to 

 make it certain that the upper portion of the ice of a glacier 

 passes o\er the lower debris-charged portion in the same way 



Fig. 30. — End of a glacier on southeast side of McCormick Bay, resting on its 

 embankment. 



that it passes over a rock bed. The lower part of the ice in such 

 cases becomes virtually an ice conglomerate, the mobility of 

 which is certainly slight. 



Morainic embanki)iC7its. — The ends of many of the north 

 Greenland glaciers appear to rest on huge embankments (or 

 pedestals, as Chamberlin has called them) of drift, which they 

 ha\'e constructed for themselves. The phenomenon is shown in 

 Fig. 30. In reality these pedestals or embankments of drift on 

 which the ends of many of the glaciers seem to rest, are less 

 extensive than they seem. In many cases they appear to be lOO 



