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

Gangjiu Limestone Fm

Period: 
Permian

Age Interval: 
P3 (51), Guadalupian and Lopingian epochs (Middle and Late Permian)


Province: 
Xizang (Tibet)

Type Locality and Naming

The type section is located at Redui Village, Gangjiu District, Zhongba County, Tibet. It was named by Wu Haoruo in 1984.


Lithology and Thickness

Limestone: Composed of light-grey, then pink massive limestones. Thickness is 30 m


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Uncertain contact with the underlying strata. Gently overthrusting upon the intermediate volcanic rocks, grey slate and shale. Next older regional unit is the Xiukang Fm

Upper contact

Uncertain contact with the overlying strata

Regional extent

Found to occur only at the Redui Village, Gangjiu District, Zhongba County, Tibet.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[82.46,30.57],[82.8,30.53],[82.97,30.5],[83.09,30.48],[83.2,30.45],[83.46,30.38],[83.64,30.31],[84.25,29.93],[84.71,29.71],[85.2,29.5],[85.42,29.42],[85.59,29.36],[86.13,29.28],[86.31,29.28],[87.37,28.96],[86.12,28.83],[85.28,28.77],[84.83,28.66],[84.67,28.6],[84.51,28.6],[84.28,28.66],[84.22,28.8],[84.22,28.96],[84.15,29.06],[84.01,29.04],[83.83,29],[83.72,28.94],[83.72,28.94],[83.59,28.97],[83.46,29.14],[83.4,29.28],[83.28,29.34],[83.16,29.38],[83.01,29.41],[82.85,29.48],[82.58,29.73],[82.42,29.8],[82.29,29.84],[82.17,29.92],[82.05,30.04],[81.96,30.09],[81.87,30.09],[81.77,30.15],[81.69,30.15],[81.5,30.19],[81.26,30.47],[81.03,30.81],[80.93,30.95],[80.9,31.09],[81.42,30.85],[82.46,30.57]]]]}}

Fossils

The light-grey limestone yields Brachiopods as represented by Enteletes, Rugivestis, Comuquia, Urushtenia, Cleiothyridina, Spiriferellina, Notothyris, Hemiptychina, Dielasmina; Corals represented by Soshkineophyllum, Amplexocarinia; and Bryozoan represented by Fistulipora, Meckopora, Fenestella, Fistuliramus, and Fistulotrypa, etc.,

The pink massive limestone yields such Fusulinida as Reichelina; Foraminifera represented by Colaniella and Paracolaniella,


Age 

The light-grey limestone fossils imply the Maokouan Subepoch = Guadalupian Epoch (Middle Permian).The pink limestone fossils imply the Lopingian Epoch (Late Permian)

Age Span: 

    Beginning stage: 
Changhsingian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
254.24

    Ending stage: 
Changhsingian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
251.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Yujing

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