Mangjiu Fm
Period:
Ordovician
Age Interval:
Katian, (60)
Province:
Yunnan
Type Locality and Naming
The type section is at Wanyaoshu in Luxi County, Yunnan. The Mangjiu Fm was named by Yunnan Team of Regional Geological Survey and Sheng Xinfu in 1963, and was published by Yunnan Compiling Workshop for Regional Stratigraphic Scale (1980).
Synonym: (芒究组）
Lithology and Thickness
The Mangjiu Fm is composed of gray medium-bedded sandy limestone intercalated with minor shale. In the type area, the Mangjiu Fm is 4.5 m thick.
Lithology Pattern:
Sandy limestone
Relationships and Distribution
Lower contact
It rests conformably on the Luxi Fm
Upper contact
It is conformably overlain by the Wanyaoshu Fm
GeoJSON
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Fossils
This stratigraphic unit yields trilobite Nankinolithus, Nileus, Ovalocephalus (Hammatocnemis).
Age
Katian
Age Span:
Beginning stage:
Katian
Fraction up in beginning stage:
0.4
Beginning date (Ma):
449.73
Ending stage:
Katian
Fraction up in the ending stage:
0.7
Ending date (Ma):
447.47
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jianpo Wang and Xiaofeng Wang