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Dongjia Formation
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Dongjia Fm base reconstruction

Dongjia Fm

Period: 
Neoproterozoic

Age Interval: 
Early-middle Sinian (Early-middle Ediacaran), Z （21, 22）


Province: 
Henan, Shanxi, Shaanxi

Type Locality and Naming

West Henan. The Dongjia Fm was named by Guan Baode et al. in 1980. The typical section is located in the Jiunüdong section (from Huanglianduo village to Dongjia village), Xiatang Town, Lushan County and the reference section is in Guyouling of Changcun village, Yexian County, Henan Province.

Synonym: （董家组）


Lithology and Thickness

The Dongjia Formation is dominated by sandy conglomerate, clastic rock and argillaceous carbonate rock. With a bed of grayish white, thick-to medium-bedded sandy conglomerate, and the top, a bed of yellow to light red, thick-bedded dolomitic limestone. The Dongjia Formation was subdivided into two parts by Guan Baode et al. (1980). Lower part is dominated by feldspathic quartzose clastic rock, bearing a layer of sandy conglomerate at the base, which was derived from cherty rock at the top of the underlying Huanglianduo Formation. Near the top, it is intercalated with siltstone, shale and glauconitic sandstone. Upper part is pale blue, purplish red, yellowish gray, thin- to medium-bedded pelitic dolomitic limestone. The outcrop thickness varies from 100 to 260 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

The base disconformably overlies the Huanglianduo Fm

Upper contact

The formation is disconformably overlain by tillite of the Luoquan Fm

Regional extent

The Dongjia Fm is widely distributed: west from Luonan County (Shaanxi Province), northward to Zhongtiao Maintain in Ruicheng County (Shanxi Province), northwest to Zhuyangzhen in Lingbao County, southward to Fangcheng and Queshan counties, and eastward to Lushan and Yexian counties, Henan Province.


GeoJSON

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Fossils

The Dongjia Fm yields microplants Trematosphaeridium sp., Polyporata sp.


Age 

Early-middle Sinian (Early-middle Ediacaran; pre-Gaskiers glacial) on schematic stratigraphic column. The ages on glauconite as determined by the K-Ar method are 665 Ma and 669 Ma.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
610.95

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.55

    Ending date (Ma):  
582.09

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.