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Xiejiawan Formation
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Xiejiawan Fm base reconstruction

Xiejiawan Fm

Period: 
Devonian

Age Interval: 
D13 (70), Early Devonian


Province: 
Sichuan

Type Locality and Naming

The type section is located at Xiejiawan Village, 500 m south of Ganxi Town, Pingwu County of Sichuan Province. It was named by Wan Zhengquan in 1974, and published by Chen Yuanren in 1978.


Lithology and Thickness

The Formation is divided into two members.

Sandstone. The Lower part, the Meijiayuan Member, 47.72 m thick, is composed of gray thin-bedded fine-grained sandstone and siltstone intercalated with thin beds or lenses of limestone.

Siltstone. The upper part, the Huoshenmiao Member, 247.22 m thick, consists of alternations of calcareous siltstone, shale and limestone with various thicknesses.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

It rests conformably on the Ganxi Fm.

Upper contact

It is conformable with the overlying Ertaizi Fm.

Regional extent


GeoJSON

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Fossils

The main fossils are brachiopoda Euryspirifer paradoxus, Otospirifer xiejiawanensis, and conodonts Polygnathus perbonus, P. cf. gronbergi of early Emsian


Age 

Early Devonian

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
404.03

    Ending stage: 
Emsian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
400.78

Depositional setting

Terrigenous clastic shelf


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)