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Lazhuhe Formation
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Lazhuhe Fm base reconstruction

Lazhuhe Fm

Period: 
Permian

Age Interval: 
P (68), Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)


Province: 
Yunnan

Type Locality and Naming

The type section is located in the area of the Lazhu River, Lanping County, Yunnan Province (99°07′, 26°45′). It was named by the Yunnan Provincial Bureau of Geology and Mineral Resources in 1990.


Lithology and Thickness

Limestone and Sandstone. Lower part is composed of grey thick-bedded limestone and bioclastic limestone, intercalated with marls, with the black slate at its base being intercalated with lenticular coals. Upper part of the formation is composed of grey-yellow and brown-yellow medium-bedded sandy conglomerate, quartz-sandstone and lithoclast-rich quartz-sandstone, intercalated with grey-black clayey slate, lime-slate and clayey limestone lenses.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Carboniferous strata. Regionally, the next older unit is the mid-Permian Gaojingchao Fm.

Upper contact

Regionally, the next younger unit might be the Lazhuhe Fm.

Regional extent

Distributed in the areas of Lazhu River of the Lanping County, Laogongzhai of Simao City and Mengkuang of the Lancang County in a NWW-trend. The thickness of the formation is increasing from west to east and from south to north in a range of 228.9-771.2 m. In the area of the Lazhu River of the Lanping County in the northern part of the region the thickness of the formation is of 467 m. In the Mongya area of the Yunxiao County the formation is composed of grey and grey-black sandy shale and shale, intercalated with cherty limestone, with a thickness of 600 m. In the area of the Laogongzhai of Simao City the lower part of the formation is composed of sandstone and siltstone, intercalated with carbonaceous siltstone, and its upper part is composed of siliceous nodule-bearing micrite, with a thickness of 228.9 m. In the Mengkuang area of the Lancang County the formation is composed largely of limestone, intercalated with a small amount of clayey limestone and calcareous siltstone, with a thickness of 458.9 m.


GeoJSON

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Fossils

Yields fossils such as Fusulinida represented by Metadoliolina lepida, Sumatrina longissima and Yabeina sp.; Corals represented by Wentzelella salinaria, as well as bivalves and plants, etc.


Age 

Lengwuan Stage of the Yangsingian Epoch = Capitanian Stage (late Guadalupian Epoch; late-Middle Permian)

Age Span: 

    Beginning stage: 
Roadian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
274.37

    Ending stage: 
Roadian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
269.21

Depositional setting

It is interpreted as shallow-sea continental-shelf carbonate and clastic deposits.


Depositional pattern:  


Additional Information


Compiler:  

Shang Qinghua