Cuifengshan Gr

The type section is located at Cuifengshan Mt. in Qujing County, Yunnan Province. Each formation has its own stratotype section located at Xishan Hill of Qujing County (103^o 42’ E - 25^o 30’ N), Yunnan Province. It was named by Ting V.K. (=Ding Wenjiang) in 1914 as Tsuifengshan Series and quoted by Grabua A.W. in 1924 at his volumes on Stratigraphy of China. In 1966, Zhang Xinping subdivided it into four formations from bottom to top: Xishancun Fm, Xitun Fm, Guijiatun Fm and Xujiachong Fm.

Synonym: Tsuifengshan Series

[Figure Simplified geological map showing the locations of the type sections of Xishancun Fm (D₁ x), Xitun Fm (D₁ xt,), Guijiatun Fm (D₁ g) and Xujiachong Fm (D₁ xj) of Cuifengshan Gr in the West Hill of Qujing City, Yunnan Province.]

The Group is a set of terrestrial deposits being characterized by different colored siltstone, shale, mudstone and sandstone, with rare conglomerate and argillaceous limestone. It is subdivided into four Formations from bottom to top: Xishancun Fm, Xitun Fm, Guijiatun Fm and Xujiachong Fm (see links for details on each.) in the classic area of Qujing. The outcrop exposed in type locality of Qujing may reach approximately 2000 m in thickness. However, in out of Qujing area, the Group is generally disconformably or unconformably contact with underlying Pre-Devonian with much less thickness.

It contains diverse plant, spore, acritarch, fish, bivalve, ostracoda and other fossils. See component formations for details.

It is suggested as littoral facies.

The “Cuifengshan Group” is disconformably in contact with the underlying strata in the outside of the type locality and with uncompleted record of its lower parts. In these areas the traditional name of Cuifengshan Group is either kept for using or renamed as new.