SMITHSONIAN EXPLORATIONS, I927 



143 





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Fig. 170. — Three shallow basins, pecked from solid sandstone, occupy the 

 middle of this circular, stone-enclosed area on the cliff above Pueblo Bonito. 

 (Photograph by Neil M. Judd. Courtesy of the National Geographic 

 Society. ) 



Fig. 171. — Among Chaco Canyon's archeological puzzles are terraces 



formed by massive retaining walls, one of which is here partially shown. 



(Photograph by Neil M. Judd. Courtesy of the National Geographic 

 Society.) 



