A newer style of pottery, reminiscent of the Mesa Verde-type pottery, was prevalent. The majority of burials found within the ruins, 149 out of a total of 186, seemed to belong to a different period as shown by the type of artifacts associated with them. T-shaped doorways, an architectural trait characteristic of Mesa Verde times, was prevalent in the later parts of the pueblo. Keyhole-shaped kivas, another Mesa Verde trait, were inserted into and between rooms of the earlier period. And finally, the Great Kiva in the central plaza, which had fallen into disuse, was rehabilitated—in a much poorer style of construction, surely, but nonetheless obviously repaired and temporarily put back into use. These factors inclined Morris to feel that some time after A.D. 1124 the pueblo at Aztec was abandoned by the Chacoan builders. Then about 1225, a new group arrived, bringing with them the general styles and culture of the area we know as Mesa Verde. As with the earlier occupation at Aztec, we do not know exactly who these second people were or exactly where they came from, although it is obvious that they had a close affiliation with the people of the Mesa Verde area. Nor do we know if they were a large group, representing a mass migration, or whether once again some of the local population may have decided to attempt building a large community. Perhaps for a second time a few people, possessing special abilities or representing a religious organization, prevailed upon either the local population of the Animas Valley or wandering migrant groups to assist them in erecting large community structures. We do know that at about this time there was a considerable population shift all over the Mesa Verde area. The people were dispersing from their normal habitats and moving into more protected locations or consolidating into larger, more defensible units. In the Mesa Verde itself, for example, they were abandoning their mesatop pueblos and crowding together in the caves or moving out of the area entirely. In the Hovenweep area, they retreated to the heads of the canyons and built watchtowers along the canyon sides and bottoms to protect their dwindling water supplies. It was evidently a period of considerable strife and turmoil. There were short periods of recurrent drought, and possibly many of these groups had begun to fight among themselves over land and water rights and other necessities of life. [Illustration: Cobblestone walls at Aztec Ruins.]