Xinghongpu Fm

The type section is located at Gaobozi-Luanshitan area, south flank of Qiantongshan-Yuquanshan Anticline, north of Shancha Village of Fengxian County, Shaanxi Province. It was named by Shaanxi Regional Geological Survey during mapping the "Shaangxian Sheet (scale 1:200,000)” in 1959, and published in Regional Stratigraphic Scale of Northwest China, Volume Shaanxi in 1962.

Synonym: Hongpu Fm

Phyllite, limestone. The Formation is divided into three members. The lithology of each member is composed of grayish-green and gray silty phyllite in its lower part, phyllite and calcareous phyllite with thin-bedded limestone in its middle part, and clayey limestone and crystalline limestone in its upper part. Total thickness is 1884-2164 m.

In the east Qinling Region, the Formation is characterized by silty slate intercalated with feldspar quartz siltstone and lenses of silty limestone, 1762 m thick.

The middle and upper members contain Brachiopoda Atrypa sp., Spinatrypa sp., Desquamatia sp., Schizophoria sp.; Coral Disphyllum sp., Sinodisphyllum sp., Temnocarinia sp., Thamnopora sp., Alveolites sp.; and Stromatoporoids Actinostroma sp., Idiostroma sp.

In the east Qinling Region, the Formation yields Brachiopoda Atrypa sp., Gypidula sp., Coral Disphyllum sp. and Conodont Ancyrodella rountundiloba alata.