Baishanbao Fm

It was named by Wang Jinbing et al. (1966) and published by the Compiling Group of Xinjiang Regional Stratigraphical Scale in 1981. The type section is located at 10 km south of Pingdingshan Mt., south of Karameri Mt. in Qitai County； the reference section is at Hongjianshangou in Fuyun (Koktokay) County, both in the Xinjiang Uygur Autonomous Region. Coordinate: 89°53′48″E, 45°03′37″N.

Synonym: (白山包组) ; the Hongluixia Fm., named by the Xinjiang Party of Regional Geological Survey is in consistent with Baishanbao Fm in lithology and fossil assemblage. Consequently, the Hongliuxia Fm is treated here as a synonym of Baishanbao Fm.

It is dominated by grey and grey green siltstone and sandstone, intercalated with conglomerate and calcareous sandstone. The thickness of this formation is various in different region from ca. 150 m at the type section to more than 675 m in Fuyun County.

It is characterized by the brachiopoda Tuvaella fauna with T. gigantean, T. rackovskii, and Howellella sp. as the dominant species. The coral fossils, such as Striatopora sp., S. tschichatscheri, Syringaxon aff. salairica and Pleurodictyum, etc., can also be found in the calcareous sandstone.