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Dahelihe Formation
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Dahelihe Fm base reconstruction

Dahelihe Fm

Period: 
Devonian

Age Interval: 
D3 (6), Late Devonian


Province: 
Heilongjiang

Type Locality and Naming

The type section is located at the both sides of Dahelihe River of Handaqi, Heihe City, Heilongjiang Province. It was named by Wang Ying et al. in 1964.


Lithology and Thickness

Sandstone, siltstone. The base is marked by light-colored metamorphosed medium-grained feldspathic quartz sandstone. Lower part is sandy conglomerate, feldspathic quartz sandstone and siltstone containing plant fossil fragments. Upper part is siltstone and chlorite slate containing many brachiopods.

Outcrops west of Handaqi are composed of dark-gray siltstone and calcareous clayey slate intercalated with feldspathic greywacke.

This formation is 500 m in thickness.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformable contacts with the underlying Genlihe Fm.

Upper contact

Conformable contacts with the overlying Xiaohelihe Fm of Carboniferous (vague age assignment).

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[125.57,49.86],[124.58,48.31],[124.87,47.76],[126.03,48.35],[126.47,49.39],[125.57,49.86]]]]}}

Fossils

Main brachiopods are: Acrospirifer sp., Cyrtospirifer sp., Spinatrypa sp., Tridensilis sp.


Age 

Late Devonian

Age Span: 
S

    Beginning stage: 
Frasnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
378.90

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
359.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)