The Jingshan Group is a newly defined metamorphic sequence between the Fenzishan Group and the Jiaodong Group. and consists mainly of terrigenous clastic and carbonate sediments. On the basis of the rock association the Jingshan Group can be classified into three formations: the Lugezhuang formation, the Yetou formation and the Douya fomation each of which can also be subclassified into two members.These three formations represent three clear sedimentar cycles which began with the deposition of coarse clast...