be placed to make a cone shape for the roof. Poles would be added to support the roof. It was then thatched with millet stalks. There was little furniture; a shallow fireplace in the middle with a stool, a bench along the wall, and a bed of cloth. Food and items were placed or hung against the walls. A pen would be built outside for animals. Yangshao villages typically covered ten to fourteen acres and were composed of houses around a central square. Social structure Although early reports suggested a matriarchal culture, others argue that it was a society in transition from matriarchy to patriarchy, while still others believe it to have been patriarchal. The debate hinges on differing interpretations of burial practices. The discovery of a dragon statue dating back to the fifth millennium BC in the Yangshao culture makes it the world's oldest known dragon depiction, and the Han Chinese continue to worship dragons to this day. Archaeological sites Yangshao, in Mianchi County, Sanmenxia, western Henan, the place which gave the culture its name, has a museum next to the archaeological site. The archaeological site of the village of Banpo near Xi'an is one of the best-known ditch-enclosed settlements of the Yangshao. Another major settlement called Jiangzhai was excavated out to its limits, and archaeologists found that it was completely surrounded by a ring-ditch. Both Banpo and Jiangzhai also yielded incised marks on pottery which a few have interpreted as numerals or perhaps precursors to Chinese characters, but such interpretations are not widely accepted. Phases The Yangshao culture is conventionally divided into three phases: The early period or Banpo phase, c. 5000–4000 BC) is represented by the Banpo, Jiangzhai, Beishouling and Dadiwan sites in the Wei River valley in Shaanxi. The middle period or Miaodigou phase, c. 4000–3500 BC) saw an expansion of the culture in all directions, and the development of hierarchies of settlements in some areas, such as western Henan. The late period (c. 3500–3000 BC) saw a greater spread of settlement hierarchies. The first wall of rammed earth in China was built around the settlement of Xishan (25 ha) in central Henan (near modern Zhengzhou). The Majiayao culture (c. 3300–2000 BC) to the west is now considered a separate culture that developed from the middle Yangshao culture through an intermediate Shilingxia phase. Artifacts See also List of Neolithic cultures of China Dawenkou culture Hemudu culture