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Genlihe Formation
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Genlihe Fm base reconstruction

Genlihe Fm

Period: 
Devonian

Age Interval: 
D22 (6), Givetian (late Middle Devonian)


Province: 
Heilongjiang

Type Locality and Naming

It was named by Zhao Guisan in 1957, with no type section indicated.


Lithology and Thickness

Siltstone. The formation consists of grayish-black siltstone and siliceous slate. It is about 200 m thick.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

The lower boundary of this formation is unclear, and usually the chlorite slate with abundant fossils is taken for the basal boundary of the formation.

Upper contact

It is overlain conformably by the Dahelihe Fm of Upper Devonian.

Regional extent

This formation is widely distributed in the Lesser Khingan region, and is also observed at the Forest Farm of Butehaqi but with comparatively smaller thickness.


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

It contains abundant brachiopods, mainly Mucrospirifeer mucronatus, Khinganospirifer paradoxispirifer, Mediospirifer khinganensis, Schuchertella sp., Tridensilis ustriskii, Spinatrypa sp., Elytha sp.; and bryozoan Sulcoretepora sp., Leptotrypella sp.


Age 

Givetian (late Middle Devonian)

Age Span: 
S

    Beginning stage: 
Givetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
385.30

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Hou Hongfei)