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Puyu Formation
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Puyu Fm base reconstruction

Puyu Fm

Period: 
Neoproterozoic

Age Interval: 
Early Qingbaikousan (early Tonian), Qb (20)


Province: 
Henan

Type Locality and Naming

Central Henan-Hubei border region. The name Puyu Fm derived from the Puyu Shale named by Wang Zejiu et al. in 1963. The naming locality is near Putaoyu village and the typical section is located in Foguangyu to Ma'anshan in Yanshi County (Songshan Mt.), Henan Province.

Synonym: （葡峪组）


Lithology and Thickness

Lower part consists of gray to dark gray siltstone and carbonaceous shale. Middle part is yellow gray, greenish yellow and red purple shale intercalated with thin-bedded fine-sandstone. Upper part is composed of gray to grayish yellow shale, of which the bottom 2-3 m is pebbly grit and sandy conglomerate. It is a thickness of 158 m.

[Figure: The Puyu Fm in the Stratigraphic column of the Wufoshan Group in Henan Province (modified from Zhang Chuanheng, 2019)]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The basal part, mainly siltstone, rests conformably on the underlying Upper Ma'anshan Formation (Jixian, late Mesoproterozoic)

Upper contact

Disconformably overlain by the Luotuopan Formation.

Regional extent

Central Henan-Hubei border region. The Puyu Formation is mainly exposed in Yuzhai Mountain to the north slope of Songshan Mountain, from Foguangyu in Yanshi County on the west, eastward to Shaolin Temple area (in Dengfeng County), then to Wuzhi Mountain area in the juncture of Dengfeng, Mixian and Gongyi counties.


GeoJSON

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Fossils

The Puyu Formation yields abundant microplants, including Archeofavosina sp., Pseudozonosphaera verrucosa, Orygmatopsophosphaera exile, Microconcentrica induplicata, Trachysphaeridium sp., Reticultum figuratum, Leiopsophosphaera minor, Nucellosphaeridium zonale, Synsphaeridium conglutinatum, Macroptycha sp., Laminarites antiquissimus etc.


Age 

Early Qingbaikousan (early Tonian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
944.00

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.