根据文献记载、考古实物资料和碳14测定年代数据，偃师商城是夏商二代断代分界的界标。
According to what recorded in literatures and data from archaeological materials as well as analysis of 14C , the Town of Yanshi in Shang Dynasty must be the precise boundary mark between the dynasties of Xia and Shang .
商二代