In 1978, Guangxi 8th Geological Team identified the limestone neptunian dykes of Maokouan stage, Middle Permian, roughly upright in the Middle Devonian Donggangling Formation and Upper Devonian Rongxian Formation. In the same place, limestone breccias of the Maokouan stage, Middle Permian, cemented Carboniferous—Early Permian bioclastics and formed breccia talus. The limestone neptunian dykes were interpretated as reopened axial cleavages in paleounconformity surface and immediately filled with transgressive sediments; or giant tensile fractures in carbonate platform in response to the seafloor spreading of the Youjiang basin and filled with synspreading sediments. The limestone breccia talus were explained as karst breccias caused by paleoanticline uplift. But those explanations couldn't accord with following observations. First, limestone neptunian dykes didn't occur only in axis plane of anticline. Second, there is no any observation back up that giant fissures wouldn't cut through whole Carboniferous to Devonian beds. Third, the Late Paleozoic strata in the Lingyun area were successive, in other words, there were no karst breccias. This study identified earthquakecaused liquefied sediments flows in limestone neptunian dykes. The study also identified that the limestone dykes were tensile fracture caused by synsediment faulting. The limestone breccia talus were shelf margin escarpment breccias and fault breccias caused by synsediment faulting. It is the long distance faulting along the Lingyun carbonate platform margin during Middle Permian that made the Middle Devonian be revealed in the Middle Permian seafloor and occurred tensile fractures which be filled with Middle Permian earthquakecaused liquefied soft flows and formal sediments. This consideration is accorded with that information from lava in Youjiang basin and the neighbor areas.