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Jinbaoshi Formation
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Jinbaoshi Fm base reconstruction

Jinbaoshi Fm

Period: 
Devonian

Age Interval: 
D22 (70), Early Givetian (Middle Devonian)


Province: 
Sichuan

Type Locality and Naming

The type section is located at Jinbaoshi, about 5 km south of Ganxi Village in Beichuan County, Sichuan Province. It was named by Wan Zhenquan in 1983.


Lithology and Thickness

Sandstone, siltstone. It is dominated by medium- to fine-grained sandstone, siltstone, clayey siltstone, calcareous clayey siltstone and a few stromatopora reef limestone, bioclastic limestone, and some oolitic hematitic beds. The thickness is 270 m.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Upper contact

Disconformity (paleosol) followed by upper Givetian Guanwushan Fm.

Regional extent


GeoJSON

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Fossils

It contains brachiopods, corals, Stromatopora fossils, etc.

Three successive brachiopods zones can be distinguished: the Athyrisina rara-Ambogolossa eleganta-Subresselandia transversa zone; the Schizophoria kutsingensis- Independatrypa zonatiforinis zone; and the Stringocephalus range zone; the later can be divided into two subzones: the Stringocephalus transversa-Subresselandia guanwushanensis subzone below and the Stringocephalus jigonglingensis-Subresselandia guanwushanensis-Hadrorhynchus guanwushanensis subzone above which is included in the overlying Guanwushan Fm.

Corals include two assemblage zones: the Dendrostella ganxiensis-D. converses zone and the Tennophyllum conplanatum- T. ganxiense-Dishphyliacon cavitabulata zone.

Stromatopora include two assemblage zones: the Actinostroma clathrotum-Parallelopora artiolata-Hermatostroma atelastum zone and the Stromatopora hupsehii-Hermatastroma perseptatum-Actinostroma stellatum zone.


Age 

Early Givetian (Middle Devonian), but Hou Hongfei et al (1988) thought that the lower part of this formation might extend down into Eifelian (used here, based on reported P. partitus conodont zone of earliest Eifelian in upper part of underlying Yangmaba)

Age Span: 
S

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
391.60

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
383.38

Depositional setting

Shore to hybrid carbonate-siliciclastic shelf


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shuitao)