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

Daba Fm

Period: 
Permian

Age Interval: 
(44), late Middle Permian (Capitanian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at Daba in Zhonghe District, Tengchong County, Yunnan; first appeared in a 1985 manuscript by Yunnan Regiona Geological Survey Team; and then 1996 usage in Yunnan Bureau of Geology and Mineral Resources (Xiang Yuanzhi, editor), Multiple Classification and Correlation of the Stratigraphy of China..


Lithology and Thickness

Gray, yellowish gray sericitic slate and siltstone with interbeds of sandstone and pebble-bearing sandstone.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Conformable onto Dadongchang Fm.

Upper contact

Regional extent

Zhonghe District of Tengchong County; assumed same regional extent as the underlying Dadongchang Fm.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.84,26.29],[98.8,25.88],[98.86,25.26],[98.83,24.81],[98.7,24.55],[98.12,24.2],[97.72,23.87],[97.6,23.9],[97.42,24.5],[97.74,25.11],[98.84,26.29]]]]}}

Fossils

Contains plants and a lot of brachiopods, gastropods, etc..


Age 

Capitanian.

Age Span: 

    Beginning stage: 
Capitanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
264.34

    Ending stage: 
Capitanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
259.55

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

James G. Ogg & Wen Du – modified from Shouxin Zhang (main editor), Geological Formation Names of China (1866-2000), 2 volumes, Higher Education Press (2009); Wang X.W. et al., 2018. Stratigraphic Division and Correlation of The Carboniferous and Permian in Yunnan Province. Journal of Stratigraphy, 42(4): 461-467 (in Chinese with English abstract)

GeoJSON estimate by Runan Yong, Suxiao Li and Wen Li (Chengdu Univ. Tech. students)