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Jingsha Formation

Jingsha Fm

Period: 
Paleogene

Age Interval: 
late Early Eocene to early Middle Eocene (21b)


Province: 
Hubei

Type Locality and Naming

Jianghan Basin - SE. The naming section is located in well Sha22 in the Jiangling area, Hubei. Named by the Jianghan Petroleum Administration in 1967.


Lithology and Thickness

Its lithology varies greatly, marked by a sequence of brownish red and purplish red mudstone with gray mudstone and light gray and light brown mudstone, locally intercalated with muddy-gypsum rock and halite. The thickness is 600–1800 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It has a conformable contact with the underlying Paleocene-Eocene Xingouzui Fm.

Upper contact

It has a conformable contact with the overlying Eocene Qianjiang Fm.

Regional extent

This formation is commonly distributed in the Jianghan basin.


GeoJSON

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Fossils

This formation contains the ostracods Echinocypris-Tuberocypris-Pseudoeucypris assemblage, the charophytes Obtusochara jianglingensis-Gyrogona qianjiangica asDsemblage, and the sporopollen Ephedripites-Meliaceoidites assemblage. It is similar to the Dacangfang Fm in the Nanyang basin, the Fourth Member of the Shahejie Fm in the Bohai Bay area and the Sanduo Fm and Dainan Fm in Jiangsu. This formation is approximately equivalent to the Fangjiahe Fm and Bailoukou Fm at the surface.


Age 

The isotopic age is 54.7 Ma.Its age was previously considered to be middle Eocene (Zheng JiaJian et al., 1999). However, new study suggests that its age should be the late Early Eocene to early Middle Eocene (Wang et al., 2019), which Wang, Y.Q., et al. (2019, Paleogene Integr. Strat. Timescale China; Sci. China: Earth Sci., 62) mid-Ypresian to early Lutetian

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
52.04

    Ending stage: 
Lutetian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
45.25

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.