Prehistoric Indians of the Southwest

by H. M. Wormington

Fig. 29—Pueblo Bonito, Chaco Canyon National Monument, New Mexico. (Courtesy National Park Service.)

One of the largest and most famous Chacoan structures is called Pueblo Bonito.[71] It was a town, consisting of a single building, which covered over three acres of ground and contained at least eight hundred rooms. It has been estimated that it could have sheltered 1200 inhabitants, and it was the largest “apartment house” in the world until a larger one was erected in New York in 1882. Building had begun at Pueblo Bonito as early as 919 A.D., but it did not reach its final form until 1067 A.D. or later. It is believed that the more definitely planned settlement may have been the work of new and more progressive people who moved into the area.

Pueblo Bonito, as it stands today after archaeologists have cleared away the dust of centuries and exposed it to view, is truly a remarkable structure. Even in ruins, it is not too difficult to picture it as it must have been during those long ago times when it was one of the great cultural centers of the Southwest. On three sides of the center court was the main building, terraced back from a one-story level in front to four stories in the rear. With each succeeding row of rooms the height was increased by one story. Extending from the ends and enclosing the side to the south was a one-story row of rooms. Outside of this single tier was the rubbish heap around which retaining walls were built. The center court contained numerous kivas, and others were incorporated in the building mass.

In addition to the regular kivas, whose diameter rarely exceeded twenty-five feet, there have also been found in Chaco Canyon, Aztec, and other sites with Chacoan architecture, big circular structures with diameters of from forty to sixty feet ringed by a concentric row of small rooms. These are known as Great Kivas. They are thought to have been religious edifices which served an entire community, while the smaller kivas probably belonged to various clans or societies. Great Kivas, though in a simpler form, were apparently present as far back as Modified-Basketmaker times when most rites were performed in dwellings, but a larger place was needed for ceremonies in which the people of a whole community or district participated.

Architecture in general reached its highest development in Chaco Canyon, and there was real beauty as well as solidity of construction. The walls were massive, although there was a decrease in thickness with succeeding stories, as the weight resting upon them was reduced. The most distinctive type of masonry consisted of a center portion of stone and adobe or rubble, faced on two sides by a veneer of horizontally laid thin, tabular stones. These are so perfectly fitted together that a knife blade can scarcely be inserted between them. Sometimes this particular type of stone was not available and it was necessary to use more massively bedded stones which had to be dressed to the proper shape, but the masonry was uniformly good. Great beams, stripped of bark and beautifully dressed, were placed across the chambers. Small poles, which were finished with equal care, were placed at right angles to the main beams and so spaced as to form patterns. Over these lay carefully fashioned mats of peeled willow, followed by a cedar splint layer. A thick coat of earth overlay the entire mass, forming a floor for the room above as well as a roof for the one below.

The use of big logs, which do not bear the scars indicative of transportation over a long distance, and the common use of willow, which must have been abundant, suggest conditions different from those of today. It is not known with certainty whether there has been a real climatic change. Many believe that, when hoofed animals were introduced by the white man, the grass cover was destroyed, and that this led to the cutting of arroyos which carried off flood waters and lowered the underground seepage and as a result the land became progressively drier, but others believe that there were earlier periods of arroyo-cutting.

Although severe erosion did not occur until a later time, it was a process with which the ancient inhabitants of Pueblo Bonito were familiar. Overlooking the Pueblo was a tremendous rock with an estimated weight of 30,000 tons, detached from the cliff and seeming so precariously balanced as to threaten the building. At the foot of the rock the prehistoric inhabitants erected a brace of wood and stone masonry. At first glance it seems a rather pathetic effort, but actually it may not show any ignorance on the part of the ancient Bonitians, but rather a familiarity with certain engineering principles which suggested that protecting the base of the rock would curtail erosion and help to prevent the threatened disaster. The fears of the prehistoric inhabitants were never realized in their time, for it was not until January 22, 1941, that the threatening rock finally fell. It damaged one hundred feet of the back wall of the pueblo and twenty-one adjacent rooms.

Rooms in Chaco-Canyon structures were relatively large and high ceilinged, with plastered walls. The inner rooms, which lacked light and air, were used for storage. Household activities were not confined to the rooms, for the roofs of the lower tiers provided additional living space, and much work, such as the preparing of food, the making of pottery, and the flaking of arrowheads, probably took place in the open. Fire places are rare in the rooms, and it seems likely that much of the cooking was done outside—in the courts and on the roofs. At first there were doorways and high windows in the outer wall, but these were later blocked off with masonry. The single gateway in the front of the pueblo was first greatly narrowed and then entirely closed, so that the great house could be entered only by means of a ladder which, if necessary, could be withdrawn. This is some of the best evidence of the fear of attack which must have existed.