[Illustration: FIG. 12.—Ground plan of ruin B.]
Ruin B (pls. 7, 8, _b_) is a better preserved example of the tower type
and is on a ridge considerably lower than that on which ruin A stands
extending at right angles. It occupies a narrow space from the rim of
Hill Canyon on one side to a rim of a tributary canyon, blocking the
passageway along the surface of the ridge to its point. This structure
(fig. 12) would appear to be structurally not unlike ruin A, but with
the wall smaller. There is a raised bench on the south side, the
tower itself being a semi-circular chamber annexed to the north side,
which extends from one canyon rim to another. The breadth of this
semi-circular room is 10 feet. The longest dimension is 31 feet and the
average height of its wall is 4 feet. The top of the wall, throughout,
is unevenly broken down, the part adjoining the bench being the best
preserved. The structure suggests a fort, for it would not be possible
to pass between this obstructing ruin without entering it through a
circular doorway, the walls of which still stand on the east side.
There is no passage between the wall and the mesa edge.