For instance, five kilometers from Jiaojia, archaeologists found the Chengziya site that represents Longshan Culture, a late Neolithic civilization in the middle and lower reaches of the Yellow River, dating back more than 4,000 years.
Excavations show the sites in this region were occupied for a long time from the Dawenkou Culture to the Han Dynasty (206 BC-AD 220), with the main remains attributed to the middle and late periods of the Dawenkou Culture. "Many people lived in this region, forming a society in which they played different roles," says Tang.
