Ranwu Gr
Period:
Devonian
Age Interval:
D2-3 (26), Middle to Late Devonian
Province:
Xizang (Tibet)
Type Locality and Naming
The type section is located at Ranwu of Zuogong (Zogong) County, Xizang. It was named by Sichuan Team of Regional Geological Survey and Nanjing Institute of Geology and Paleontology in 1982.
Synonym: Rangwu Gr
Lithology and Thickness
Dolostone. In the type area, the Group is incomplete, and is characterized by grayish and yellow medium- and thick-bedded dolostone and dolomitic limestone intercalated with limestone and basalt.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
It rests conformably on the Dingzonglong Fm.
Upper contact
Regional extent
It is distributed in Zuogong and Ranwu area along the Nujiang River.
GeoJSON
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Fossils
The upper part yields coral Zaphrentis sp.
Age
Middle to Late Devonian
Age Span:
S
Beginning stage:
Frasnian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
378.90
Ending stage:
Famennian
Fraction up in the ending stage:
1.0
Ending date (Ma):
359.30
Depositional setting
It is interpreted as a platform lagoon.
Depositional pattern:
Additional Information
Compiler:
(Xian Shiyuan)