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Yingzhunianga Formation

Yingzhunianga Fm

Period: 
Triassic

Age Interval: 
late Late Triassic? (TJ72)


Province: 
Sichuan

Type Locality and Naming

Sichuan Province Regional Stratigraphic Table Compilation Group was named in 1978. The named section is located in Eduozhuo West, Xionglong Township, Hexi District, Xinlong County, Sichuan Province.

Synonym:


Lithology and Thickness

The overall appearance is the same as that of the underlying Lamaya Fm [= dark gray quartz sandstone, feldspar quartz sandstone, interbedded with black carbonaceous slate and silty slate]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The pebbled coarse sandstone and conglomerate at the bottom are in unconformable contact with the dark gray hard sandy quartz sandstone at the top of the underlying Lamaya Fm.

Upper contact

Regional extent

The group is not widely distributed, only in Eduozhuo, Xionglong Township, Xinlong County, with the most complete outcropping between the Yingzhuniang and Rilunniang mountain passes, with a thickness of 490 m.


GeoJSON

null

Fossils

Plants: Ptilozamites chinensis, Lepidopteris ottonis, Dictyophyllum nathorsti, Clathropteris meniscioides, Todites shensiensis


Age 

Schematic stratigraphic section and "overlying Lamaya Fm" implies it is uppermost Triassic, used here (not "early Early" as on submitted English-translation.]

Age Span: 

    Beginning stage: 
Rhaetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
205.74

    Ending stage: 
Rhaetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
201.36

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Zhou Huiqin, Zhou Ze and Tong Jinnan.