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Xiaheilonggong Formation
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Xiaheilonggong Fm base reconstruction

Xiaheilonggong Fm

Period: 
Devonian

Age Interval: 
D1 (7), Early Devonian


Province: 
Heilongjiang

Type Locality and Naming

The type section is located at West Hill of Heilonggong, Shangzi City of Heilongjiang Province. It was named by Zhu Songnian in 1961 and was published by Nan Renshan and Guo Shengze in 1992.


Lithology and Thickness

Claystone, sandstone, limestone. The formation is divided into two members:

Lower Member, more than 200 m thick, is composed of grayish-black thin-bedded crystalline limestone, grayish-white thick-bedded marble, tuffaceous sandstone, quartz sandstone and slate.

Upper Member, 895 m thick, consists of alternating of slate and fine-grained sandstone.

In Yincun area, it is characterized by conglomerate, sandy slate and limestone.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Neither its top nor its bottom outcrops. Next younger unit in region is the Hongchuan Fm volcanics

Upper contact

Neither its top nor bottom outcrops.

Regional extent


GeoJSON

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Fossils

The limestone contains brachiopoda Leptaenopyxis bouei, Rhitistrophia sp., Coelospira sp., Cyrtinopsis sp.; coral Favosites sp., Squameofavosites sp.; and trilobite Phacops sp.


Age 

Early Devonian

Age Span: 
S

    Beginning stage: 
Pragian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
412.40

    Ending stage: 
Emsian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
394.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)