No vegetation grows over the walls of the buried roomblocks
of this ancient town, possibly because the adobe (mud) used in
the construction of the walls and rooms is sterile, or too densely
packed. The result is that the outlines of the buried pueblo are
revealed to the aerial observer. Some of the rooms (at center
of photo) have been opened by excavation, leaving rectangular
cavities. The small circle in the center of the largest enclosure
(plaza) is the trace of the pueblo's kiva, or semi-subterranean
ceremonial chamber (the small tree beside it is the same one in
the center of the ground-level photo).