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Zhangshanji Formation

Zhangshanji Fm

Period: 
Paleogene

Age Interval: 
Early Eocene , (23b)


Province: 
Anhui, Jiangsu

Type Locality and Naming

The naming section is located from Wangjiagang Village to Daoqiao Village ~1.5 km north of Zhangshanji, Lai’an County, Anhui. Named by the Regional Geological Survey Party, Anhui Bureau of Geology in 1974 and used in a relevant journal in 1976.


Lithology and Thickness

Lower part is grayish white or gray red or purplish red sandy conglomerate, muddy sandstone and sandy mudstone with gray or grayish green mudstone, containing calcareous concretions. Middle part is brick-red sandy mudstone and mudstone and pink pebbly sandstone and muddy sandstone with sandy conglomerate lenses, containing mammals. Upper part is brick-red or purplish red sandy conglomerate, pebbly sandstone and muddy sandstone. The thickness is up to 109 m.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

It has a disconformable contact with the underlying Paleocene-Eocene Shunshanji Fm.

Upper contact

It has an unconformable contact with the overlying Eocene Goutoushan Fm or basalt.

Regional extent

It is mainly distributed in the border region of Tianchang and Lai’an counties of Anhui and Luhe County of Jiangsu.


GeoJSON

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Fossils

Besides worm tubes and the gastropods Amnicola sp. and Strobilops lata, the main fossils in the formation are relatively monotonous mammals such as Rhombomylus laianensis. Rhombomylus is a unique Eocene form of Asia. Zhai Renjie et al. (1976, 1978) thought that Rhombomylus laianensis is close to T. turpanensis found in Xinjiang in morphology; therefore the ages of the fossiliferous horizons in the two regions should also be close.


Age 

Its age was previously considered to be Early Eocene or slightly younger (Zheng et al., 1999). Recent studies assign this formation to early Early Eocene corresponding to the Thanetian Stage (Li et al., 2019; Wang et al., 2019). Wang, Y.Q., et al. (2019, Paleogene Integr. Strat. Timescale China; Sci. China: Earth Sci., 62) assign as spanning early Ypresian.

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0

    Beginning date (Ma): 
56.00

    Ending stage: 
Ypresian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
52.04

Depositional setting

The formation is fluvial-lacustrine deposits.


Depositional pattern:  

Additional Information


Compiler:  

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