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Dainan Formation

Dainan Fm

Period: 
Paleogene

Age Interval: 
early Early Eocene (23c)


Province: 
Jiangsu

Type Locality and Naming

The naming section is the well columnar section in the vicinity of Daidan Township, Xinghua County, Jiangsu. Named by the Sixth Reconnaissance and Exploration Party, Ministry of Geology, in 1970.


Lithology and Thickness

The lithology varies greatly laterally. Two members are distinguished: Lower member consists of alternating beds of grayish black mudstone and sandstone or primarily of mudstone. Upper member has well-developed sandstone, marked by alternating beds of purplish red mudstone and sandstone. The total thickness is 350–650 m.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Funing Fm.

Upper contact

The formation has a disconformable or unconformable contact with the overlying Sanduo Fm.

Regional extent

This formation is distributed in drill wells in the northern Jiangsu depression and southern Jiangsu area, being only absent in the Jianhu-Baoying-Hongze area and the coast-Wuxungang area west of Yancheng.


GeoJSON

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Fossils

This formation contains abundant ostracods, charophytes and sporopollen. Ostracods are represented by the Cypris decaryi-Sinocypris reticulata-Eucypris subtriangularis assemblage, charophytes the Neochara huananensis-Obtusochara longicalumnaria assemblage, and sporopollen the Ulmipollenites-Inaperturopollenites –Pterisisporites.


Age 

Its age was previously considered to be Early Eocene (Zheng et al., 1999). Recent study assign this formation to early Early Eocene (Wang et al., 2019). The Zhangshanji Formation in the northern Jiangsu basin is equivalent to it. Wang, Y.Q., et al. (2019, Paleogene Integr. Strat. Timescale China; Sci. China: Earth Sci., 62) assign as Lingchan regional stage spanning the early Ypresian.

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.0

    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 fluvio-lacustrine (predominantly lacustrine) deposits.


Depositional pattern:  

Additional Information


Compiler:  

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