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Hongchuan Formation
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Hongchuan Fm base reconstruction

Hongchuan Fm

Period: 
Devonian

Age Interval: 
D1?-D21 (7), Eifelian (early Middle Devonian)


Province: 
Heilongjiang

Type Locality and Naming

The type section is located at 3.5 km south of Hongchuan Station in Shangganling District, Yichun City, Heilongjiang Province. It was named by Liu Diansheng et al. in 1980.


Lithology and Thickness

Tuffaceous breccia. It is composed of grayish-green and yellowish-brown tuffaceous breccia intercalated with grayish-green pebbly meta-sandstone and limestone lenses. It is 257.8 m thick.


Lithology Pattern: 
Volcanic_ash


Relationships and Distribution

Lower contact

The contact relations with the upper and lower sequences are unclear. Next older unit in region is the Xiaheilonggong Fm

Upper contact

The contact relations with the upper and lower sequences are unclear.

Regional extent

Southwards to the No. 14 Forest Farm, the formation changes into siltstone, slate, carbonaceous slate, calcareous quartzose fine-grained sandstone and bioclastic limestone.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[127.94,49.05],[127.19,48.12],[127.72,46.89],[129.04,46.1],[130.12,46.95],[130.62,48.28],[129.66,49.12],[127.94,49.05]]]]}}

Fossils

It yields abundant brachiopods Coelospira sp., Leptostrophia sp., Spinatrypa sp., Megastrophia sp. and bryozoan, crinoid stems.


Age 

Eifelian (early Middle Devonian), and probably straddles downward to Early Devonian as well.

Age Span: 
S

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
394.30

    Ending stage: 
Eifelian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
385.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)