Siqiancun Fm
Type Locality and Naming
The Siqiancun Formation was erected by Li Qingping and Zhao Fengjiang in 1992. The section for the designation is from Dingjiagou to Youxinxing of the Dasheng Town of Anqiu City of Shandong (118°51′E; 36°18′N).
Lithology and Thickness
The Siqiancun Formation is represented by compositionally compound conglomerate, gray gravel-bearing grit, purple gray lithic sandstone, fine sandstone with sandy conglomerate and mudstone. The Siqiancun Formation is 619.10 m thick.
Relationships and Distribution
Lower contact
Its base is a conformable contact marked by purple gray sandstone with sandy conglomerate is distinguished from yellow gray fine sandstone with gray mudstone of the underlying Tianjialou Fm.
Upper contact
Its top is disconformably overlain by the Quaternary in the type section, but regionally it is in conformable contact with the overlying Mengtong Fm (=Mengtuan Fm).
Regional extent
The formation occurs in the Ximu fault zone. In the Mengtong area of Zhucheng of east Shandong, it is represented by gray and gray purple conglomerate and coarse sandy gravels with purple medium- fine-grained sandstone and break red siltstone, with a thickness of more than 500 m. In the Mazhan basin of the Yishui County of west Shandong, it is dominated by sandy conglomerate with sandstone and shale, measuring 600 m in thickness.
GeoJSON
Fossils
The formation yields floras Brachyphyllum cf. ningshiaensis.
Age
Depositional setting
It belongs to fluvial facies.
Additional Information