G/.. IC/.I I. GFa )L OGV ( )F X( >A' 77/ t/AViV-.W'/,. / AV) 



803 



glacier ice certainly exteiuled that far down into the debris. 

 The ice seen at this point, and in other gorges in similar situa- 

 tions, was distinctly laminated or stratified, and the laminae were 

 much contorted, just as in the case of glacier ice. This is 



Fig. 31. — A morainic embankment, left at the terminus of an extinct cliff glacier, 

 north side of Herbert Island. 



mentioned only as indicating that the ice which cements the 

 debris is not ice formed by the freezing of water which has 

 trickled down from above into the debris, though in some cases 

 this may be the fact. 



It is evident that the growth of an embankment would be 

 chiefly at the very terminus of a glacier. It is here that 

 advance motion ceases, and it 'is here that all the material 

 brought down from above must stop. It is easy to see that the 

 debris, or debris-filled ice (which for present purposes amounts 

 to the same thing) under the end of the active ice, might 

 easily become higher than the bed of the glacier above. The 

 ice would then have to push the embankment forward, or rise up 

 over it. This probably has something to do with the upturning of 



