ROCK GLACIERS IN ALASKA 



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Fig. 9. — Rock glacier in McCarthy Creek valley (Fig. i, Nu. 4). Il terminates 

 below at the mouth of the hanging valley in which it lies, this being the point at which 

 the interstitial ice fails to make possible a slow glacier-like movement. The material 

 from the end of the rock glacier has streamed down to form a well-developed talus 

 cone. Photo by F. H. Moffitt. 



