1991  Liang & Wang, p.147: Greyish green, dark grey thin,
           medium to thick-bedded siltstone intercalated with
           calcareous sandstone, sandy limestone, limestone
           lenses or thin-bedded limestone, with conglomerate
           about 20-30 mm thick in the base and with 3 m medium
           to thick-bedded silty-fine sandstone in the top.