According to systematic petro-mineral appraisal, differential thermal. X-ray differentiation and electron-microscope tests and quantitative analyses of trace rare elements from the volcanic event deposits of the Upper Carboniferous? Lower Permian series in Nanpiao, Liaoning, and Daqingshan, Inner Mongolia, deposit sequences of 12 volcanic events have been identified, including the 34~39th volcanic beds from bottom to top. Because the volcanic beds have their respective petro-mineral and geochemical features, they will provide a reliable basis for further proving the time-space distribution pattern of the volcanic event deposits on the northern margin of the North China plate and making stratigraphic correlation taking the volcanic beds as maker beds.