A new division of the metamorphosed strata in the Jiaodong Region is presented, following the regional geological mapping in the Region in recent years. The Jiaodong Group is purified by separating the Jingshan Group from it. Thus the stratigraphic sequence of the Jiaodong Group, which is of the Late Archaean era, goes like (in the declining order of age): Tangjiazhuang Formation, Yingzhuangkuang Formation, Qishan Formation and linjiazhai Formation, with its source rocks as a feries of pyroclastic rocks and...