NO. 2 SMITHSONIAN EXPLORATIONS, I918 7I 



Sand Canyon, one of the northern triln:taries of the AIcEhiio, 

 contains several prehistoric buildings which have not hitherto been 

 described, but ofifer possibilities for future research. Among these 

 are well-made clifif-houses, one of the best preserved of which is 

 shown in figure 83. There is another house (fig. 84) in a ceremonial 

 cave, consisting of a single circular kiva of the Mesa \ erde type 



Inc. 79. — D-shaped tower, McLean Basin, Utah. Photo- 

 graph by J. Walter Fewkes. 



surrounded by rectangular rooms, occupying the whole floor of the 

 cavern. This building is a unique example of a pueblo of the single 

 unit type situated in a cave. A remarkable feature is the existence 

 of walls of a more modern kiva built inside those of an older chamber, 

 resembling in this respect one of the kivas of S])ruce Tree House, 

 on the Mesa Verde Xational Park. Another unusual ruin in Sand 



