3 of the cirqu 



31<> 



It is evident that i 

 be filled with debris up to a certain point. Again since the 

 cirque at this stage is not filled with ice, its walls will 

 more and more tend to have the atmospheric slope of repose 

 induced in them. Thus the cirque wall which at this stage 

 is free from ice and snow covering in great measure, will 

 be in a state of unstable equilibrium, and will shower down 

 debris on to the reduced glacier which will transport it for 

 short distances and dump it at the earliest opportunity to 

 form lateral and terminal moraines. In a short time then 

 the signs of the old abrasive action will vanish and the 

 cirque wall will be rough and jagged. (Fig. 17). But this 

 le development of the amphitheatrical head in 



and slope of corra 

 sapping. The ice 

 lower half of the c 



Upper Evolution Valley. The I 

 visible, as is also the upper slope of 

 v have only just disappeared from the 



