Qianjiang Fm
Type Locality and Naming
Jianghan Basin - SE. The naming section is in a well in the Qianjiang area in south-central Hubei. Named by the Jianghan Petroleum Administration, 1965.
Lithology and Thickness
A sequence of dark gray mudstone, brownish red, purplish red and grayish green mud-gypsum rock and halite with sandstone, oil shale and oolitic marlstone. It is about 600–4000 m thick
Relationships and Distribution
Lower contact
The formation has a conformable contact with the underlying Eocene Jingsha Fm.
Upper contact
The formation was deposited continuously with the overlying late Eocene Jinghezhen Fm.
Regional extent
It is distributed in west-central and eastern Hubei, northern Hunan and western Anhui.
GeoJSON
Fossils
There are abundant fossils. The Second Member contains the ostracods Cyprinotus macronefandus-C. igneus assemblage and the charophytes Grovesichara kielani, Stephanochara globula, Charites jinjiachangensis and Croftiella laticellula. Ostracods in the First Member are represented by the Cyprois zhanggangensis-Cyprinotus jingheensis assemblage and charophytes include such species as Charites molassica and Maedlerisphaera chinensis. In addition, there are also the foraminifera genera Quinqueloculina and Triloculina, as well as fishes and sporopollen. The sporopollen assemblage is dominated by deciduous and broadleaf plants with a certain quantity of tropical and subtropical elements. Gymnosperms are mainly Taxodiaceae, Pinaceae and Ephedripites.
Age
Depositional setting
Additional Information