Gangou Fm
Period:
Devonian
Age Interval:
D3 (78), Late Devonian
Province:
Yunnan
Type Locality and Naming
The type section is located at Gangou Village, Dacaozi of Ninglang Yizu Zizhixian (100o59’E-27o 05’N). It was named by No.4 Team of Yunnan Geological Survey in 1977 and published in Yunnan Lithostratigraphy (ed. Zhang Y.Z) in 1996. It is synonymous to Sanglongtan Fm, which appeared in 1978.
Lithology and Thickness
Oolitic limestone. Formation, 527.3 m thick, is composed of light gray and grayish-white thick-bedded oolitic limestone, fine-grained crystalline limestone and dolomite with few clayey limestones.
Lithology Pattern:
Oolitic limestone
Relationships and Distribution
Lower contact
It rests conformably on the Lanniqing Fm.
Upper contact
Disconformable contact with the overlying shale of Permian Liangshan Fm
Regional extent
GeoJSON
null
Age
Frasnian to Famennian (early Late Devonian)
Age Span:
Beginning stage:
Frasnian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
378.90
Ending stage:
Frasnian
Fraction up in the ending stage:
1.0
Ending date (Ma):
371.10
Depositional setting
It is suggested as intertidal to lagoon environment.
Depositional pattern:
Additional Information
Compiler:
Hongfei Hou