Abstract:The westmost boundary of the Wushan Formation of the lower Cambrian deposits in the Central-Southern Shandong starts from Tangshan in Yiyuan County and ends to the east of Jiuzhai and Jiepai in Mengyin County. In this region, the depositlonal characters are: (1) a large depositional area with the depositional materials supplied sufficiently from the land; (2) the extensive subsidence of the area during the Ca mbrian period; (3) the frequent fluctuation of the sea level and a strong scouring by sea water wit...