The settlement pattern was quite variable, depending upon availability of food resources and season of the year. Stable social units generally occurred where resources were stable, with individual families in other areas moving with their annual seasonal round. Families were generally found within a local geographic district, often around a single valley or Winter village cluster. Temporary dwellings were favored and dwelling types varied according to availability of building materials, length of stay, and use. The usual winter house, holding a small family, was a conical, bark-covered hut, while semisubterranean, earth-covered winter dwellings have also been reported. Many families sought shelter in caves rather than build huts. Sun shades were in use during the summer. Circular brush dwellings were built by some groups, and Others built domed wickiups. Conical or domed sweat houses were in almost universal use, as were huts for secluding menstruating women.