Niangniangshan Fm
Period:
Cretaceous
Age Interval:
Early Cretaceous, K1nn, (30)
Province:
Jiangsu
Type Locality and Naming
Subei Basin. Gu Xiongfei (1955) firstly called the strata as the Niangniangshan bed. The name of Niangniangshan Formation was given at the National Stratigraphic Conference of China (1959). The type locality is in the Hongmushan – Niangniangshan section in the Jiangning County, Jiangsu.
Lithology and Thickness
The Niangniangshan Formation consists of a group of alkali-intermediate volcanic clastic rocks.
Lithology Pattern:
Volcanics
Relationships and Distribution
Lower contact
Upper contact
Regional extent
The Niangniangshan Formation is distributed mostly in the Ningwu basin of Jiangsu.
GeoJSON
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Fossils
None listed
Age
Shown as Aptian by Xi et al (2019; Cretaceous integrated stratigraphy and timescale of China); but LA-ICP-MS zircon U-Pb ages arein 131 to126 Ma range (summary in Xing, G.F., et al., 2021, "Mesozoic-Cenozoic volcanic cycle … East China". Jour. Earth Sci.) = late Hauterivian. Regionally, the Dawangshan Fm volcanics in this same Ning-Wu Basin are slightly older (ca. 132-130.5 Ma).
Age Span:
Beginning stage:
Hauterivian
Fraction up in beginning stage:
0.3
Beginning date (Ma):
130.77
Ending stage:
Hauterivian
Fraction up in the ending stage:
1.0
Ending date (Ma):
126.50
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Wan Xiaoqiao