Peidi Fm
Type Locality and Naming
The type section is the Tanchong-Peidi-Luoshikou (Peidi) section, lying, about 8.5 km west of Daning Town, Babu District, Hezhou City, Guangxi Zhuang Autonomous Region (111°45’E, 24°25’N) and was measured by Guangxi Regional Geological Reconnaissance Team in 1965. The Peidi Formation was first published by Guangxi Bureau of Geology and Mineral Resources (1985). The name is derived from Peidi Village in Daning Township, Babu District, Hexian City, Guangxi Zhuang Autonomous Region. It was originally appeared in a 1976 manuscript by the Guangxi Regional Geological Survey Team.
Synonym: （培地组）
Lithology and Thickness
The Peidi Formation is a clastic and silicate sequence. Lower and middle parts of the formation consist of greyish green and greyish black, thick-bedded hetero-granular feldspathic quartzose sandstone, quartzose sandstone with interbeds of shale and siliceous rock; Upper part consists of thick-bedded sandstone, hetero-granular sandstone, siltstone with interbeds of shale and siliceous rock. The formation contains usually 3 to 5 layers of siliceous rock, each is 40 to 50 m thick. In the type section, the formation is 1301 m thick.
Relationships and Distribution
Lower contact
Upper contact
The Peidi Fm is in conformable contact with the overlying Xiaoneichong Fm. The upper boundary is defined by the disappearance of siliceous rock at the top of the Peidi Fm or appearance of sandy shale of the Xiaoneichong Fm.
Regional extent
The Peidi Formation is exposed in Cathaysia Area of South China Region, distributed in eastern of Guangxi Zhuang Autonomous Region, between the Dayaoshan Mountain in the west and Yingyangguan Mountain Pass in the east (e.g., Menshan County of Wuzhou City, Zhaoping County and Babu District of Hezhou City). The thickness of the formation ranges from 1301 to 1373 m.
GeoJSON
Fossils
The mid-upper part of Peidi Formation in the type section yields sponge spicules Protospongia sp. In other localities, the formation yields micro-paleoplant fossils Acanthotriletes sp., Conglobulosphaera incrustus, Lophotriletes aff. crusus, Stenozonotriletes aff. dedaleus, and Tyloligotriletes sp.
Age
Depositional setting
Additional Information