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Haitong Formation
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Haitong Fm base reconstruction

Haitong Fm

Period: 
Devonian

Age Interval: 
D21 (26,31,32), Eifelian ((early Middle Devonian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Haitong of Mangkang County, Xizang. It was named by Sichuan No.3 Team of Regional Geological Survey in 1972, and was published by Sichuan Compiling Group for Regional Stratigraphical Scale (1978).


Lithology and Thickness

Sandy claystone, metamorphic. It is composed of grayish-black carbonate phyllite intercalated with grayish-white thick-bedded calcareous quartz sandstone, partly intercalated with gray clayey bioclastic limestone. It is more than 20 m in thickness.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The formation is disconformably underlain by the purplish-red shale and grayish yellow slate of the Qingnidong Gr of Lower Ordovician.

Upper contact

The formation is overlain by the gray thin-bedded limestone of the Dingzonglong Fm.

Regional extent

It is distributed at Gyorxung of Changdu and at Haitong of Markam (Gartog) County, Xizang. To the south, it can extend to northwestern Yunnan where its thickness reaches more than 1000 m and the lower part of the Haitong Fm may extend down into Early Devonian.


GeoJSON

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Fossils

It yields brachiopods Acrorospirifer, Athyrisina.


Age 

Eifelian (early Middle Devonian)

Age Span: 
S

    Beginning stage: 
Emsian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
395.92

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Xian Siyuan)