为一套砂岩泥岩泥灰岩灰岩岩石组合下部石洲段为生物介壳泥质灰岩泥岩粉砂质泥岩泥岩中部大联村段为黑灰色泥质灰岩上部六景段为土黄色泥质灰岩泥岩夹紫红色灰岩含腕足类以东京石燕贝腕足动物群为特征可分为下部Rorospirifer tonkinensis- Dicoelostrophia crenata 组合带和上部Eosophragmophoria sinensis- Parathyridina tangnae组合带四射珊瑚Xyriphylloides nobilis- Heterphaulactis semicrassa组合带双壳类PtychopteriaActinopteria productaMytilarca cf. chemungensisPheioidea obtusa等三叶虫Gravicalymeae sp.Lobopyge sp.Schizoproetoides sp.等及苔藓虫菊石竹节石及介形类等化石整合位于那高岭组之上莫丁组之下层型剖面厚242米区域厚3-303米