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Pueblo Bonito, probably the largest single prehistoric Indian building in the Southwest at the time it was constructed, represents the highest development of Anasazi architecture. Most of the construction was between the years A.D. 1030 and 1079. The bulk of the wall’s thickness was made up of rough, unshaped random stones laid in mud mortar. Then the walls were veneered, inside and out, with the carefully fitted stone you see here. The stone used for the facing, a hard, dense sandstone, was quarried from a narrow band of rock at the top of the cliff behind the pueblo. So much of this stone was used to build the great houses of the canyon that most of it has been removed for a mile east and west of Pueblo Bonito, but in other places the signs of ancient quarrying are still evident.
West end of Pueblo Bonito during excavation by Wetherill and Pepper in the 1890’s
The small, rectangular openings in this wall were vents for air and light in the lower rooms. The round holes are sockets for vigas, ceiling beams.