This photo shows the corner of a set of rooms that stacked above one another. Visible in this photo are remains of the wooden timbers which formed the floor of one room and the ceiling of the room below it. The larger, more widely spaced logs (visible on the left wall of the right two photos above) were the major supports. On the other wall, narrower, more tightly spaced logs can be seen. This formed the second layer, laid at right angles to the first layer. These were, in turn, covered with brush and, possibly, a layer of plaster to form a flat floor for the upper room. Pueblo Bonita, Chaco Culture National Park, NM.

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