Chuandong Fm
Period:
Devonian
Age Interval:
D21 (56), early Middle Devonian
Province:
Yunnan
Type Locality and Naming
The type section is located at Chuandong Village of Qujing County, Yunnan Province.
It was named by Yunnan Team of Regional Geological Survey in 1977, and formally quoted by Pan Jiang et al. in 1977.
Lithology and Thickness
Sandstone. The lithology is mainly characterized by gray, grayish-yellow, brownish-red, and purplish-gray sandstone and silty mudstone. It is 130 m in thickness.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Upper contact
The top is a conformable contact with the overlying pisolite-bearing limestone of Haikou Fm
Regional extent
GeoJSON
null
Fossils
The lower part yields Antiarchi: Bothriolepis sp., Wudinolepis sp.; in upper part it yields Bothriolepis sp., Xichonolepis qujingensis and the ostracoda: Briatina sp., Hermmannina sp.
Age
early Middle Devonian
Age Span:
Beginning stage:
Eifelian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
394.30
Ending stage:
Eifelian
Fraction up in the ending stage:
1.0
Ending date (Ma):
385.30
Depositional setting
Depositional pattern:
Additional Information
Compiler:
(Wang Shitao)