The strata strike NE,and its rock association are consisted of pyroclastic sedimentary rock,micrite and pyroclastic rocks,and containts brachiopoda,coral,bryozoan.

时于中泥盆世早期,大体相当于艾菲尔阶-吉维特阶,应归为大民山组。

Recently some Brachiopoda, coral, gastropoda, phytolite is identified by Nanjing Institute of Geology and Palaeontology China Academy of Sciences.The age belongs to Late Carboniferous epoch.

该层中发现了一些腕足类、珊瑚、腹足类、植物化石，经中国科学院南古生物研究所鉴定，时晚石炭世晚期。