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Heyuanzhai Formation
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Heyuanzhai Fm base reconstruction

Heyuanzhai Fm

Period: 
Devonian

Age Interval: 
D22-D31 (29), Givetian to Frasnian (Middle - Late Devonian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at Heyuanzhai to Chenjiazhai in Shidian County, Yunnan Province. The reference section is on the hillside about 500 m south of Malutang Village in Shidian County, Yunnan Province. It was named by Sun Yunzhu in 1945.


Lithology and Thickness

It is dominated by gray to light-gray, medium- to thick-bedded sparite limestone intercalated with granular limestone, bioclastic limestone and clayey shale.

It is 350 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The Formation has a conformable contact with the underlying marl and clayey limestone of the Malutang Fm.

Upper contact

The Formation is overlain by the crystalline limestone of the Dujiacun Gp (or Dazhaimen Fm).

Regional extent

The formation is distributed in Baoshan, Shidian, Mangshi and Zhenkang areas, Yunnan Province.


GeoJSON

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Fossils

It contains abundant brachiopods Aulacella eifelensis, Kerpina viata, Uncinulus pentagonus, Kayserella, Indospirifer and coral Heterophrentis yuannanensis, Acanthophyllum.


Age 

Givetian to Frasnian (Middle - Late Devonian)

Age Span: 

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
384.02

    Ending stage: 
Frasnian

    Fraction up in the ending stage: 
0.2

    Ending date (Ma):  
377.34

Depositional setting

It is interpreted as a carbonate platform.


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)