Shifang Fm
Type Locality and Naming
Local unit. The type section is located at Trough 710, east of Shuimogou, Yuejiashan Hill of Shifang County, western Deyang City, Sichuan Province. It was named by Wang Shitao and Li Xueren in 1988.
Lithology and Thickness
Breccia. The Formation is characterized by dark-gray breccia with phosphorite containing sulfur, phosphorus, aluminum and strontium, and by grayish claystone with pyrite.
In the type area, the Formation is condensed - only 7.35 m thick.
Relationships and Distribution
Lower contact
The unit is unconformable underlain by the Sinian Danying Dolomite Fm.
Upper contact
The unit is disconformably overlain by the Upper Devonian Shawozi Fm (early Late Devon), which yields Cyrtospirifer sinensis and Atrypa spp.
Regional extent
The Shifang Formation is mainly distributed in Pengxian, Shifang, Gunxian area of the middle section of Longmenshan Mts.
GeoJSON
Fossils
It contains fish fossils Bothriolepis spp.
Age
Depositional setting
Additional Information
The town of Shifang was called "Phosphorite City" from the rich veins of phosphate rock and associated chemical industry.