SMITHSOXIAX EXPLORATIONS. I929 



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Fig. 22. — Cambrian quartzites resting on the planed surface of deeply weath- 

 ered old gneisses. This weathering happened before the Cambrian beds were 

 deposited. Camp Creek, east (if Melrose. Montana. (Photograph by Resser. ) 



Fig. 23. — Afternoon shadows creeping across the magnificent glaciated Tctun 

 Canvon, Wyoming. ( Photograph by Resser. ) 



