Pottery was remarkably fine and designs were often quite elaborate. There was such specialization that the products of various centers are readily distinguished. Culinary ware was corrugated. Among the decorated types, black-on-white predominated but there was some black-on-red ware and some black bowls with red interiors, and in the Kayenta district and farther south polychrome pottery was widely made. Late in the period black-on-orange wares became important in the Little Colorado drainage. Much progress was made in the weaving of cotton cloth. Ornaments were highly developed and turquoise was widely used. Remarkable mosaics as well as beads and pendants were manufactured. Some coiled baskets were still made but yucca ring baskets were the leading type. Although it is only in the realm of material culture that we have concrete evidence, there can be little doubt that the heights reached in the production of material things must have been reflected in the whole life of the people. There is every reason to believe that an essentially democratic form of government prevailed, but communal living must have required a high degree of organization. Doubtless religion played a great part in the life of the community and had far-reaching influences. In the latter part of the thirteenth century, the Southwest seems to have had a dry period, marked by arroyo cutting that destroyed farmland, which was followed by a disastrous drought. These factors, with possible raids by nomadic warriors, internal discord, and probably others of which we are ignorant, led to a general withdrawal of population from many areas and a concentration in the central portion of the Plateau. THE REGRESSIVE AND HISTORIC-PUEBLO PERIODS The period which followed the Great-Pueblo era and which lasted until historic times was called _Pueblo IV_ under the Pecos Classification. It was defined as “the stage characterized by contraction of area occupied; by the gradual disappearance of corrugated wares; and, in general, by decline from the preceding cultural peak.”[74] At the present time it is often referred to as the _Regressive-Pueblo_ period.[110] This term is not really satisfactory. Admittedly, the latter part of the thirteenth and the beginning of the fourteenth century was a period of great instability, migrations occurred, and centers of population shifted. Once the shift had been made, however, important new communities developed in the drainages of the Little Colorado and the Rio Grande, and a renaissance began. It seems entirely possible that the Pueblo people might have achieved another remarkably high cultural stage had it not been for the arrival of the Spaniards in 1540.