Claystone, dark green grey to brown grey, trace-10% silt, 0- trace calcite, 0-trace very fine grained quartz, trace pyrite and micromica, 0-trace glauconite, soft to firm. Siltstone, medium to dark grey to brown grey, 30-40% argillaceous matrix, trace calcite cement, trace-2% very fine grained quartz, trace-10% glauconite, hard.