From 2000 to 2001,Sichuan Province Institute of Cultural Relics and Archaeology carried out excavations on the Yueliangwan platform of Sanxingdui site with an excavation area of 367 square meters,and found a total of 273 relics of the pre-Qin period,including 152 ash pits.These ash pits all date back to the Sanxingdui culture,distributed in the excavation area of each exploration unit,providing important materials for the staging research and establishment of chronological system of the Sanxingdui site.Varying in opening layers,sizes,depths and shapes,the ash pits share complex overlapping and cutting-into relations,with abundant unearthed relics consisting a majority of diversified types of pottery.Among the ash pits,8 of them which yielded relatively more pottery date from the second phase of Erlitou culture to the third phase of Yinxu culture,with a total of 3 phases and 5 stages,basically covering the development stages of the Sanxingdui culture.The ash pits are presumably related to the people who had higher social class in the prosperous period of the Sanxingdui city,their household waste formed the majority of the pits.Meanwhile,the ash pits indicate that the site had been in use for a long time,when the people here were busy with production and life.A small number of ash pits have yielded high-grade relics such as jade collared Bi 璧 and jade Cong琮,the buried items and age of which are consistent with H105 in the"big ditch"on Qingguanshan platform,there is a possible close connection between them and the sacrificial activities.
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