Liujia Fm
Type Locality and Naming
Sichuan Basin - south. The naming section is located in the Hulinbao–Hongyanba area north of Liujiachang 60 km northwest of Yibin County, Sichuan. Named by the Airborne Regional Geological Survey Party, Sichuan Bureau of Geology, in 1980.
Lithology and Thickness
Lower and Middle parts are light brick-red, massive, medium-grained, lithic quartzose sandstone and light brick-red fine- to medium-grained, clayey-calcareous, lithic, arkosic sandstone with some brownish red mudstone lenses. Upper part is light brick-red, thick-bedded to massive, medium- to fine-grained, clayey, lithic arkosic sandstone or alternating beds of medium- to thin-bedded, fine-grained, arkosic sandstone and brownish red, calcareous mudstone; the base, massive sandstone with huge well-developed oblique bedding. Its thickness is 88 m.
Relationships and Distribution
Lower contact
The base part conformably overlies the Cretaceous Gaokanba Fm.
Upper contact
In the type section, the upper part unconformably underlies the Quaternary.
Regional extent
This formation is mainly distributed within an area of ~20 km2 around Liujiachang. It is absent in other areas. Westward to Xiliangsi, this formation is 40 m thick, with its upper part being missing.
GeoJSON
Fossils
The formation contains the ostracods Eucypris, Paracypris and Candona and the charophytes Charites.
Age
Depositional setting
Additional Information