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Yongde Formation
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Yongde Fm base reconstruction

Yongde Fm

Period: 
Permian

Age Interval: 
P (45), Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]


Province: 
Yunnan

Type Locality and Naming

The type section is located in the Anpaitian area 2 km to the east of the Yongde County Town, Yunnan Province; and the reference section is situated in the Xiaoxinzhai Village of the Gengma County. It was named by Lan Chaohua et al. in 1983.

Synonym: (1) Bingma Fm (The typical profile is the measured profile of the Lower Permian in Hewan Street, Baoshan County, Yunnan (99°18'00"E; 25°09'00"N) Yunnan Regional Geological Survey Brigade, surveyed in 1980). (2) Manli Fm (曼里组; The Manli Formation was named in 1966 by the first sub-unit of the Yunnan First Regional Geological Survey Brigade. It has the same name as the Bingma Fm and has been discontinued), (3) Yongde Fm (永德组)


Lithology and Thickness

Clastics. Composed of light-yellow siltstone, siltstone, sandy conglomerate and shale, with a thickness of 52 m. Bingma Fm (equivalent) is purple silty claystone, gray silty shale and tuff, tuffaceous sand and shale interbedded, and the bottom is clastic rock of iron-bearing tuffaceous sandstone. Contains corals, brachiopods, bryozoans, bivalves, etc. Thickness: 52-135 meters.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Disconformable or an unconformable contact with the underlying Woniusi Fm

Upper contact

Conformable contact with the overlying Shazipo Fm

Regional extent

Distributed in the areas of Baoshan City, Zhenkang, Yongde and Luxi Counties.


GeoJSON

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Fossils

Yields abundant biologic fossils, including brachiopods such as Leptodus, Costiferina, Waagenites, Orthotichia, Spiriferella, etc.; corals such as Iranophyllum; Fusulinids represented by Schwagerina; Plant fossils (phytolites) such as Pecopteris, Taeniopteris and problematic fossil such as Glossopteris.


Age 

Yangsingian Epoch = Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]; Roadian-Wordian (inferred from Wang et al., 2018). Span of lowermost Kungurian through Roadian according to Shuzhong Shen et al. (2019; China Integrated Strat.).

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
281.51

    Ending stage: 
Roadian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
269.21

Depositional setting

It is interpreted as littoral shallow-sea deposits.


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujiang, with additions by Wen Du as modified from Wang X.W. et al., 2018. Stratigraphic Division and Correlation of The Carboniferous and Permian in Yunnan Province. Journal of Stratigraphy, 42(4): 461-467 (in Chinese with English abstract)