The so-called Twin Towers, which seen together from certain points
appear as one ruin (pl. 15, _a_, _b_), rank among the most impressive
buildings in Square Tower Canyon. They stand on the south side of the
canyon on a rock isolated by a cleft from the adjoining cliff. The
larger (fig. 9, _A-E_) has an oval ground plan and a doorway in the
southwest corner; the smaller (_F_, _G_, _H_, _I_) is horseshoe shaped
with a doorway in the east wall, which is straight. The arrangement of
rooms is seen in figure 9. Small walled-up caves are found below the
foundation on the northwest base of the larger room.
[Illustration: FIG. 9.—Ground plan of Twin Towers.]