Plate 1\' 



Fig, 1. — The Cocopah Range, viewed from near the bank of New River. The charac- 

 teristic DETRITAL SLOPES (WaSH ASSOCIATION) SHOW DISTINCTLY. ThE VEGETATION 



IN THE FOREGROUND IS MAINLY SALTBUSH (Atri'plex polycarpa) . 



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Fig. 2. — Crossing a spur of the Cocopahs, March 31, 1915. 



