1 Introduction Much research has been carried out on the Upper Cambrian of the northern part of the North China Platform, including that on stratigraphy by Lu et al. (1994) and Xiang et al. (1981, 2000) as well as that on sedimentology by Wang et al. (1989), Meng et al. (1986) and Feng et al. (1990). In recent years, a great deal of fruitful research on sequence stratigraphy has been made, such as the chronostratigraphic studies of Shi et al. (1997) and Mei et al. (1996), and those on plat…