Guanshanpo Fm
Type Locality and Naming
The Guanshanpo Fm is the uppermost formation in the Pingyipu Gr. The type section is located between northwest of Ganxi Village and the 71 km milestone of the Mianping road in Beichuan County, Sichuan Province. It was named by Hou Hongfei, Wan Zhengquan et al. in 1988.
Lithology and Thickness
Sandstone. It is dominated by gray to light-gray medium-bedded fine-grained quartz sandstone intercalated with greywacke. It is 242 m in thickness.
Relationships and Distribution
Lower contact
It rests in a conformable contact with the underlying Guanyinmiao Fm
Upper contact
It is in a conformable contact with the overlying Bailiuping Fm
Regional extent
The formation is mainly developed at Ganxi of Beichuan County and also in Pingwu County; and it thickness reduces at Yanmenba in Jiangyou County, at the southeast limb of Tangwangzhai syncline.
GeoJSON
Fossils
The lower part yields fish fossils Macropetalichthys and Arthrodira; the middle part yields bivalve, ostracods, inarticulate brachiopods, plant and spore fossils; and trace fossils are developed in the upper part. In Ganxi section of Beichuan County, this formation yields fish fossils Chuanbeiolepis jiangyouensis, Yunlongolepis ligui, Parapetallichthys minor and fragments of Arthrodira, as well as bivalves, plants.
Age
Depositional setting
Dleta
Additional Information