Wudang Fm
Type Locality and Naming
The type section is located at Dapingshan of Mairangzhai, Wudang region of Guiyang City, Guizhou. It was firstly reported by Pan Jiang et al. in 1975.
Lithology and Thickness
Siltstone. This formation is a set of variegated clastic rocks, consisting of purplish-red, flesh-red and light-gray siltstone, silty mudstone and quartz sandstone, intercalated with ferruginous quartz sandstone and pebble sandstone in the base. It is 80-120 m thick.
Relationships and Distribution
Lower contact
The formation has a disconformable basal contact to the underlying purplish-red thin-bedded ferruginous clayey siltstone of Gaozhaitian Gr of Lower Silurian.
Upper contact
The formation is overlain by light-gray to grayish-white quartz sandstone of Mazongling Fm.
Regional extent
Limited distribution to near Guiyang.
GeoJSON
Fossils
The formation yields abundant fish fossils Kueichowlepis sinensis, Sinopetalichthys kueiyangensis, Neoduyunaspis minuta.
Age
Depositional setting
It is interpreted as a littoral (foreshore) facies.