为深灰色薄层-中厚层灰岩、鲕状灰岩、微晶灰岩及生物碎屑灰岩夹泥质灰岩,产珊瑚:Yuanophyllum kansuense,Neozaphrentites sp.,Bradyphyllum sp.,Siphonophyllia sp.,Caninia sp.;腕足类:Cleiothyridina cf. Submabranacea,Punctospirifer sp.,Syringothyris cf. texta,Productus sp.,Eochoristites cf. elongata。与下伏月牙湖组及上覆恰提尔群均呈整合接触。厚85-200米。