About a quarter of a mile south and east of the main ruin, on the opposite side of the little valley before mentioned, a mesa bench similar to the one last described occurs; and on a point of this, extending almost to the river bank, there are traces, now nearly obliterated, of a small cluster of rooms. A short distance east of this point there is a large rounded knoll, with a peculiar terrace-like bench at about half its height. The entire summit of this knoll was occupied by rooms, of which the walls are much broken and none remain standing. This knoll, with the ruins on its summit, is shown in plate XIX, which also gives a general view from the north of the small cluster southeast of the main ruin. The character of the valley of the Verde at this point is also shown. The sketch map, figure 284, shows the location of these ruins in reference to others of the group. The main cluster, that portion occupying the crown or summit of the butte before described, exhibits at the present time some fifty rooms in the ground plan, but there were at one time a larger number than this; and there is no doubt that rooms extended down the slopes of the hill southward and southwestward. The plan of this main cluster is peculiar; it differs from all the smaller surrounding clusters. It tells the story of a long occupancy by a people who increased largely in numbers, but who, owing to their hostile environment, could not increase the space occupied by them in proportion to their numbers. It will be noticed that while the wall lines are remarkably irregular in arrangement they are more often continuous than otherwise, more frequently continuous, in fact, than the lines of some of the smaller villages before described. The rooms are remarkably small, 10 feet square being a not unusual measurement, and built so closely together as to leave no space for interior courts. The typical rooms in the ruins of this region are oblong, generally about twice as long as broad, measuring approximately 20 by 10 feet. [Illustration: Plate XXII. GENERAL VIEW OF RUIN 8 MILES NORTH OF FOSSIL CREEK.] In the ruin under discussion it seems that each of these oblong rooms was divided by a transverse partition into two smaller rooms, although the oblong form is also common. This is noticeable in the southwestern corner and on the eastern side of the main cluster, in the southwestern corner and on the northern end of the cluster adjoining on the north, and in all the smaller clusters. It is probable that the western central part of the main cluster was the first portion of the group of structures built, and that subsequently as the demand for accommodation increased, owing to increase of population, the rooms on the eastern and southern sides of the main cluster were added, while the rooms of the older portion were divided.