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Baidingpu Formation
Click to display on map of the Ancient World at:
Baidingpu Fm base reconstruction

Baidingpu Fm

Period: 
Permian

Age Interval: 
P2 (54b), Guadalupian Epoch (Middle Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located in the Baidingpu area to the east of the Kangma County Town (also spelled "Kangmar" County), Shigatse Prefecture, southern Tibet near border with Bhutan.. It was named by by Zhang Binggao in 1974 (Permian System, in Reports on Scientific Expedition of Qomolangma District (1966–1968), Geology, Beijing: Science Press, 74–75).


Lithology and Thickness

Limestone. Grey-white crystalline limestone and marble. This formation is characterized by an abundance of rounded bryozoan fragments and crinoid columns, which tend to form beautiful black-and-white sharply contrasted decorative patterns after their crystallizations. Thickness is about 250 m


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Conformable contact with the underlying Kangma Fm.

Upper contact

Disconformity with early Triassic Tulong Fm is implied by Permian lexicon chart column. However, in this region, the next younger unit seems to be Lvcun Gr of early Triassic

Regional extent

Distributed in the area of Kangma County.


GeoJSON

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Fossils

Fairly abundant animal fossils, including corals such as Amplexocarinia kangmarensis, Sochkineophyllum, Plerophyllum, Tachylasma and Lytvolasma, and brachiopods represented by Neospirifer, Spiriferella, Athyris, Chonetella, Stenoscisma, etc.


Age 

Assigned to the late stage of the Yangsingian Epoch = Guadalupian Epoch (Middle Permian)

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
279.73

    Ending stage: 
Wordian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
264.34

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)