NO. 12 



SMITHSONIAN EXPLORATIONS, I917 



121 



situated on points of the mesa rim or perched on fahen angular 

 rocks on the floor of the canyon. It may be mentioned that their 

 walls are constructed of good masonry, which has effectually resisted 

 the erosive power of the elements. 



Fig. 126. — Group of ruins in Holly Canyon. Photograph liy J. W'irsula. 





Fk;. 127. — Horseshoe Ruin. Hackhcrry j^roui). r'h()tn.L;rai)Ii hy J. Wirsula. 



1 he early l)uil(kr> were jirone lo introduce curved walls in these 

 buildings; they were j»artial to circular. o\;d, and I )-shaped struc- 

 tures, although sf|uare and rectangular luiildings arc common. They 

 paid little attention to leveling the foundations (jii which the walls 



