2. Cannonball Ruin. Prudden, pl. xxi [xxii].

3. “Small tower-like structure ... at the head of Ruin

Canyon, in the Yellow Jacket group.” Prudden, pl.

xxiii, fig. 2. (This building is not in Ruin Canyon,

but in Holly Canyon.)

4. “Tower ... about the head of Ruin Canyon.” Prudden,

pl. xxiii, fig. 1. (This is the most eastern of the

Twin Towers, but not about the head of the canyon.)