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Linxi Formation
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Linxi Fm base reconstruction

Linxi Fm

Period: 
Permian

Age Interval: 
P2-3 (13, 16), middle and late Permian


Province: 
Hebei

Type Locality and Naming

The type (representative) section is the Dongguandi-Qujiagou section in Linxi County, as recommended by the Regional Geological Survey Party of Hebei Province in 1959. It was named by Teihard de Chardin in 1924-1926.


Lithology and Thickness

Clastics. Lower part represents a member of grey-black silty slate and shale, with its upper layer yielding plant fossils (phytolites), with a thickness of 1494 m. Upper part represents a yellow-green and grey-green sandstone member, composed largely of fine-grained sandstone and siltstone, intercalated with clayey limestone lenses and slate, with the middle and lower layers yielding a big amount of bivalves and plant fossils (phytolites), with a thickness of 732 m. The clayey rocks are intercalated with phosphorus-bearing bands and nodules. Total thickness is over 2226 m


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Unconformable contact with the underlying Xiwuzhumuqinqi Fm

Upper contact

Unknown contact relationship with the overlying Mesozoic strata. [This might be the regional Alatanheli Gr of middle Jurassic]

Regional extent

Distributed in the Linxi region to the north of the Xilamulun River in the Zhaomuda League.


GeoJSON

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Fossils

Bivalves such as Palaeomutela khinganensis, P. soronensis, etc.; Plant fossils (phytolites) such as Calamites, Paracalamites, Noeggerathiopsis, etc.,


Age 

Assigned as middle to late Permian

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
259.55

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting

The beds with bivalves are interpreted as a lake-facies.


Depositional pattern:  


Additional Information


Compiler:  

Li Li