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Taowan Formation
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Taowan Fm base reconstruction

Taowan Fm

Period: 
Neoproterozoic

Age Interval: 
Qingbaikouan-Nanhuan (Tonian-Cryogenian), Qb- Nh (29)


Province: 
Henan, Shaanxi

Type Locality and Naming

North Qinling Mts (west Henan). The Taowan Fm was named by Yan Lianquan in 1959. The type section is located at Taowan Town, Luanchuan County, Henan Province.

Synonym:


Lithology and Thickness

The Taowan Fm consists of two parts. Lower part is the Mugou Member (although some geologists consider it as the upper part), which consists mainly of gray, gray-white thick- to medium-bedded marble, interbedded with carbonaceous phyllite with hematite and biotite-sericite quartz schist. Upper part, the Fengmaimiao Member, is composed of sericite dolomite marble, thin-bedded banded marble, quartz phyllite, sericite phyllite, and locally phyllite interbedded with marble. The Taowan Formation is 930-2000 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The bottom boundary is unexposed or is an unconformable with the underlying Kuanping Gr (Mesoproterozoic)

Upper contact

The Taowan Fm is unconformably covered by the calcareous conglomerate of Sanchakou Fm (Ediacaran)

Regional extent

North Qinling Mts (west Henan-southeast Shaanxi). At present, the Taowan Formation is tectonically restricted to the north of Tieluzi-Luanchuan fault. It is widely distributed from Luonan, Lanqiao Town in Lantian, Shaanxi Province to Lushi, and eastwards to Miaozi Town, Luanchuan, Henan Province, trending E-W over 230 km.


GeoJSON

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Fossils

Microplants: Lignum nematoideum, Polyporata microporosa, Laminarites sp.? Triangumorpha sp., Trematosphaeridium holtedahlii, Trachy- sphaeridium sp., Taeniatum crassum, Leiopsophosphaera sp., Margominuscula sp. etc.


Age 

Qingbaikouan-Nanhuan (Tonian-Cryogenian) span on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
635.00

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.