Nanshichong Fm
Period:
Ordovician
Age Interval:
Katian, (50)
Province:
Hunan
Type Locality and Naming
The type section is at Nanshichong in Xiangtaoyuan, Taojiang County, Hunan. The Nanshichong Fm was named by Jin Yuqin et al. (1964), and was published by Central-South Compiling Group for Regional Stratigraphic Scale (1974).
Synonym: (南石冲组）
Lithology and Thickness
The Nanshichong Fm is characterized by dark gray mudstone, with black shale in the upper part. In the type area, the Nanshichong Fm is 25 m thick.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
This stratigraphic unit rests conformably on the brownish yellow shale yielding abundant graptolite and trilobite at the top of the Modaoxi Fm
Upper contact
It is conformably overlain by the siliceous shale of the Wufeng Fm
Regional extent
It is widespread in Central Hunan.
GeoJSON
null
Fossils
It yields graptolites Climacograptus and Orthograptus.
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:
0.8
Ending date (Ma):
446.72
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jianpo Wang and Xiaofeng Wang