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Langmaria Formation
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Langmaria Fm base reconstruction

Langmaria Fm

Period: 
Permian

Age Interval: 
P1 (Carb61), Early Permian


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is lies from the south slope of Deriangma Mt. to Xiala Mt., 6 km northeast of Yunzhug Township, Xianza (Shenzha), Tibet. It was named by Yang Shipu and Fan Yingnian in 1982.


Lithology and Thickness

Sandstone and Limestone. Light-gray and gray-green thin- to moderately thick-bedded medium- and coarse-grained feldspar-quartz pebbly sandstone, glacial-till conglomerate, fine-grained sandstone and siltstone, intercalated with thin-bedded sandy-clayey limestone, compact limestone and calcareous siltstone. Thickness reaching 877.4 m


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

Conformable contact with the underlying Angjie Fm

Upper contact

Conformable contact with the overlying Permian Xiala Fm

Regional extent

Distributed at Yunzhug Township of Xianza County, Yangwei Mt. of the Shiquan River, both banks of the Zhanjin River north of Jipu Village, Cameng and Tuotala of Rutog County, et al.


GeoJSON

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Fossils

Containing Brachiopods Trigonatreta sp., Stepanoviella sp., Neospirifer fasciger paucicostulata, Spiriferellina cristata; Corals Wannerophyllum rianense, Plerophyllum ngangjiense, Lophophyllidium sp., Paralleyia yunzhugensis, Amplexus romanovskyi, Amplexocarinia sp., etc.,


Age 

Early Permian

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
278.84

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
276.16

Depositional setting

It is interpreted as glacial-marine to neritic


Depositional pattern:  


Additional Information

This following entry was in the Carboniferous Lexicon suite, for some reason. Difficult to reconcile with age span of Angjie Fm as indicated by Shuzhong Shen et al (2019; Permian integrated stratigraphy and time scale), who did not have this unit on their Lhasa regional summary.


Compiler:  

Fan Yingnian