24G 



THE NATIONAL GEOGRAPHIC MAGAZINE 





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Photograph by Frank I. Join 

 FUMAROEES IN FRONT OF BAKED MOUNTAIN CAMP 



Photograph by R. E. Helt 



ONE OF THE MANY CRATERS IN THE SAND-FEOW 



The presence of these craters is evidence that explosions occurred after the general 

 body of the hot sand-flow had come to rest. The whole surface of the east arm of the valley 

 is pitted with craters like this. Many of them are the seats of vigorous fumaroles. 



