A number of conformable stratiform Pb-Zn deposits and occurrences such as Heiqu-Xuequ, Honghua,Baixionggou, Hetaoping, Zhongxiping, Baoshuixi and Shuangfenggou have been discovered since the 1990s along the Dadu River valley on western margin of the Yangtze Craton by the 207 Geological Team under the Sichuan Geological and Mineral Resources Bureau and local mining companies. These Pb-Zn deposits and occurrences are hosted in the same stratohorizon of phosphate and siliceous dolomite of the Maidiping Member on the top of the Upper Sinian-Lower Cambrian Dengying Formation and the ore beds are confined to the siliceous rock and brecciated dolomite layer. The outcrop of the ore beds of the Heiqu-Xuequ deposit has a length of 6000m, and its Pb-Zn resources is estimated up to 3.7 Mt. The distribution of various deposits and occurrences forms an ore belt over 50 km long and the total Pb-Zn resources in the ore belt is hopeful up to 10 Mt. The typical ore structures, e.g., stratiform, laminated, banded, sedimentary brecciated, interbedded folded, and slump structures, exhibit sedimentary characteristics. The geological and geochemical characteristics of these stratiform deposits are notably different from those of both the MVT-type Pb-Zn deposits hosted in the cover carbonate rocks and VMS-type Pb-Zn deposits hosted in the Mesoproterozoic metamorphic basement rocks of the Huili Group in the regional Pb-Zn ore belt. This study suggests that the silicalite paragenetically related to Pb-Zn ore is originated from hydrothermal sedimentation, and the deposits are genetically Sedex-type. The Pb-Zn mineralization is controlled by the Hanyuan-Emei depression and a contemporaneous fault in the middle of the depression during the Late Sinian-Early Cambrian Dengying Period. The Sedex-type deposit is probably the one with largest resources potential in the Pb-Zn belt on western margin of the Yangtze Craton.