Editing Chalcolithic (section)

===East Asia===
{{more citations needed section|reason=establish use of the term "Chalcolithic", not just of the presence of copper|date=October 2018}}
{{main|History of metallurgy in China#Copper}}
In the 5th millennium BC copper artifacts start to appear in East Asia, such as in the [[Jiangzhai, Xi'an|Jiangzhai]] and [[Hongshan culture]]s, but those metal artifacts were not widely used during this early stage.<ref>{{cite journal |first1=Christian E. |last1=Peterson |author2-link=Gideon Shelach-Lavi|first2=Gideon |last2=Shelach |date=September 2012 |title=Jiangzhai: Social and economic organization of a Middle Neolithic Chinese village |journal=[[Journal of Anthropological Archaeology]] |volume=31 |issue=3 |pages=241–422 |doi=10.1016/j.jaa.2012.01.007}}</ref>

Copper manufacturing gradually appeared in the [[Yangshao]] period (5000–3000&nbsp;BC). [[Jiangzhai]] is the only site where copper artifacts were found in the [[Banpo]] culture. Archaeologists have found remains of copper metallurgy in various cultures from the late fourth to the early third millennia BC. These include the copper-smelting remains and copper artifacts of the [[Hongshan culture]] (4700–2900) and copper [[slag]] at the Yuanwozhen site. This indicates that inhabitants of the [[Yellow River]] valley had already learned how to make copper artifacts by the later [[Yangshao culture|Yangshao]] period.<ref>{{cite book |author1=Chang, Kwang-Chih |author2=Xu, Pingfang |author3=Lu, Liancheng |year=2005 |title=The Formation of Chinese Civilization: An archaeological perspective |publisher=Yale University Press |page=66}}</ref>