ROCK GLACIERS IN ALASKA 



369 



I have been able to find in the hterature scant reference to features 

 of this kind. In the Falkland Islands there are so-called "stone 

 rivers," described by Thomson,' Andersson,^ and others, which seem 

 to correspond closely to those in the area here described, but which 

 occur on much lower slopes. Andersson, in an article on "Solifluc- 

 tion," or soil flow, thinks that these Falkland " stone rivers," which now 



Fig. 6. — Lower end of rock glacier on McCarthy Creek (Fig. i, No. i). The 

 material at the edge lies at an angle of 35°. The stream has been able to keep open 

 only a narrow channel at the base of the rock glacier. 



are composed of angular blocks, were formerly filled with fine mud 

 and that the blocks of rock, buoyed up by the mud, slowly flowed 

 down the valleys. He conceives that the fine material has since 

 been removed by running water. There is now no movement of these 

 "stone rivers." 



The rock glaciers do not fall under the term "solifluction," as 

 used by Andersson, for he describes a movement of rock debris com- 



I Thomson, The Atlantic, 245. = J. G. Andersson, op. cit. 



