It is thought to date from the early Shang or from the late Xia, which is known only from legend. Harvard University, where Chang Kuang-chen teaches, is currently carrying out excavations at Shangqiu in He'nan in the hope of learning more about the origins of the preShang cultures.
目前張光直任教的哈佛大學在河南商邱展開發掘，想進一步探尋先商的來源。