There is no evidence that any portion of this cluster attained a greater height than two stories, and only a small number of rooms reached that height. The small cluster adjoining on the north, and those on the southeast, southwest, and west, were built later and belong to the last period of the occupancy of the group. The builders exhibited a decided predilection for a flat site, as an examination of the sites of the various room clusters in the ground plan (plate XVII) will show, and when the sight of the main cluster became so crowded that additional rooms could be added only by building them on the sloping hillside, recourse was had to other sites. This tendency is also exhibited in the cluster adjoining the main cluster on the north, which was probably the second in point of age. The northern end of this small group of rooms terminates at the foot of the hill which rises northeastward, while a series of wall lines extends eastward at an angle with the lines of the cluster, but along the curve of the hillside. The small northern cluster was in all probability inhabited by five or six families only, as contrasted with the main cluster, which had sixteen or seventeen, while the smaller clusters had each only two or three families. The strong presumption of the later building and occupancy of the smaller clusters, previously commented on, is supported by three other facts of importance, viz, the amount and height of the standing wall, the character of the sites occupied, and the extraordinary size of the rooms.