26 



SMITHSONIAN INSTITUTION 







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Fig. 21. — Pack train on the Nankoweap Trail. Note how advantage is taken 

 of a softer hed to locate the trail. (Photograph by Resser. ) 



Fig. 22. — One of the large algal masses found in the shales of 

 Nankoweap Valley. (Photograph by Resser.) 



the 



