Wujiafang Fm

The conformable base to the underlying Yijiawan Fm is placed at the disappearance of clayey limestone and the appearance of calcareous clayey clastics with oolitic hematite.

The upper contact is disconformable to the overlying Yuelushan Fm that begins with a basal conglomerate.

The formation is mainly distributed in Yiyang, Taojiang, Ningxiang, Changsha area, northern Hunan, and is characterized by terrestrial clastic deposits that decrease Southward in abundance and grain size as clayey and calcareous sediments increase. To the North, the Yiyang and Taojiang area is dominated by grayish-white quartz sandstone and purplish-red siltstone, intercalated with a few pebble-bearing sandstones and sandy conglomerates.

To the South at Cuiping of Ningxiang area, the lower part is mainly siltstone intercalated with sandy shale and marl, partly intercalated with limestone lenses, and the upper part yields a few coral and stromatopora.

Further South further to Leimingqiao, Fukou of Lianyuan, the lower part is composed of shale and siltstone, intercalated with fine-grained quartz sandstone, clayey limestone and bioclastic limestone, yielding abundant brachiopods and coral; and the upper part is mainly grayish-white quartz sandstone intercalated with siltstone and a few sandy limestone lenses, yielding plant fossils, and is about 500 m thick.