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

时代属中泥盆世早期,大体相当尔阶-吉维特阶,应归属为大民山组。

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.

该地层中发现了一些腕、珊瑚、、植物化石，经中国科学院南京地质古生物研究所鉴定，时代属晚石炭世晚期。