﻿N.O. 10 



SMITHSONIAN EXPLORATIONS, 1923 



79 



Fig. 74. — The Clay Hills exLend suiilluvaiii u) uu- Km San Jiuui a.> an 

 unscalable barrier of red and gray shale, overtopped by sheer walls of pink 

 sandstone. (Photograph by E. L. Wisherd. Courtesy of the National Geo- 

 graphic Society.) 



Fig. 75. — ^^When Moki Canyon cut its tortuous course, massive caves were 

 formed at every angle and in these caves prehistoric peoples sought refuge 

 from the elements and from their tribal enemies. ( Photograph by E. L. 

 Wisherd. Courtesy of the National Geographic Society.) 



