Weiguan Gr
Type Locality and Naming
The type section is located in Zhagurilao of Weiguan in Lixian County, Sichuan (NW Sichuan near border with Qinghai). The reference section is nearby Huanliangzi of Lixian County, Sichuan. It was named by Regional Geological Branch Team of Ganzi Geological Team, Sichuan in 1960, and is published by No. 2 of Sichuan Regional Geological Survey in 1975.
Lithology and Thickness
Clayey sandstone, then Sandy limestone. It is a set of very-thick-bedded epi-metamorphic rock. The main lithology is metamorphic quartz sandstone and phyllite, and the Upper part has abundant intercalations of thin-beds and lenses of limestone. The thickness ranges from 271 to 1750 m.
Relationships and Distribution
Lower contact
It conformably overlies on Maoxian Gr of Silurian.
Upper contact
It is in a disconformable contact with overlying Xuebaoding Gr of mid-Early Carboniferous
Regional extent
The formation is distributed in Pingwu, Songpan, Beichuan, Danba, Maowen, Wenchuan etc. of back-Longmenshan area.
GeoJSON
Fossils
Its Lower part yields graptolite Neomonograptus falcarius, and the Upper part contains Tabulata Favosites.
Age
Depositional setting
Additional Information
In Wenchuan, Maowen, Beichuan line, the upper part is interbedded with phyllite, has abundant intercalations of thin-bedded limestone and contains abundant fossils.