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Heinishao Formation
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Heinishao Fm base reconstruction

Heinishao Fm

Period: 
Permian

Age Interval: 
P3 (67), Wuchiapingian Stage of Lopingian Epoch (early Late Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at Heinishao of Heqing County, Yunnan Province. It was named by Misch in 1946.


Lithology and Thickness

Coal-bearing Siltstone, micritic limestone and Volcanics. It is divisible into three parts. Lower part of the formation is composed of siltstone, micritic limestone and grey-green dense massive and amygdaloidal basalt and coal seams. Middle part of the formation is composed of grey, grey-yellow siltstone, intercalated with lithoclast sandstone, micritic limestone, carbonaceous siltstone and coal layers and seams. Upper part of the formation is composed of grey siltstone and clayey siltstone, intercalated with limestone.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Emeishan Basalt Fm (locally also called the Yangjiaping Fm )

Upper contact

Next younger regional unit is the Changxing Fm (latest Permian) or the Luguhu Fm (Early Triassic) or Qingtianpu Fm (also Early Triassic).

Regional extent

Distributed in a S-N-trend in the Xujiaping area of Ninglang County, Baishui area of Lijiang City, Dadili area of Yongsheng County, and Heinishao area of Heqing County, Yunnan Province, and being thicker in the north and thinner in the south. The formation is lithologically changeable greatly. In the Baishan and Dadili areas, it is composed of basalt, amygdaloidal basalt, tuff, sandstone and shale, intercalated with carbonaceous shale, with a thickness of 309 m, which in the Xujiaping and Huotoucun areas in the northern part of the region the formation contains thin coal layers and coal seams, with its lower part being intercalated with basalt and amygdaloidal basalt, with a thickness of 116-1355.7 m.


GeoJSON

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Fossils

Plant fossils (phytolite) such as Gigantopteris guizhouensis; brachiopods as represented by Leptodus richthofeni, Productus margniplicatus, Dielasma cf. biplex, Enteletina, Meekella kueichowensis and Productus yangtzeensis; and Trilobites such as Pseudophillipsia, etc.,


Age 

Wuchiapingian Stage of Lopingian Epoch

Age Span: 

    Beginning stage: 
Wuchiapingian

    Fraction up in beginning stage: 
0.15

    Beginning date (Ma): 
258.75

    Ending stage: 
Wuchiapingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
254.24

Depositional setting

It is interpreted as littoral swamp-facies deposits.


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua