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Ningyuancun Formation
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Ningyuancun Fm base reconstruction

Ningyuancun Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (20)K1nyc


Province: 
Heilongjiang

Type Locality and Naming

The was named by Zhong Weicheng, Yang Yu in 1964, and was first cited publicly by the Compiling Group for the Regional Stratigraphic Chart of Heilongjiang Province. The naming section is located in the area extending from the Ningyuan Village to the Zhongxin Village of Binxian County, Heilongjiang Province, with its reference section being situated at the Sunjia Hills of Binxian County. The type locality is the Jiayin County of Heilongjiang. The key section is the Dagunzigou section in Jiayin.

Synonym: （宁远村组）


Lithology and Thickness

The Ningyuancun Formation composed of purple, grayish purple, grayish white and grayish green volcanic rock and clastic rocks. It is 1673.99 m at the key section, and 340-2175 m thick regionally. [Separate Jurassic Lexicon draft entry had: Lower part of the formation represents grey and grey-green andesites and their tuffs and breccias, with a thickness of about 82 m. Upper part consists of light-violet, violet and grey-violet rhyolitic porphyries, with a thickness of 255 m.]


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

Banzifang Fm is unconformably underlying the Ningyuan Fm (Ningyuancun Fm)

Upper contact

The Ningyuancun Formation is unconformably underlying the Yongqing Fm. [HOWEVER -- Kosenko et al. (2021) do not indicate a Ningyuancun Fm or a Banzifang Fm, but imply a major discontinuity of the overlying Yongancun Fm onto the mid-Cretaceous Taoqihe Fm.]

Regional extent

[Separate Jurassic Lexicon draft entry had: The formation is distributed essentially in the areas of Binxian, Archeng, Wuchang and Shangzhi Counties. The lithology of the formation is consistent in various regions, and is possessed of distinct common characteristics which lie in a widespread occurrence of smoke double-chain quartz phenocryst and rose potassium feldspar, being in a bright-purple color, and very clear rhyotaxitic structure. The total thickness of the strata of the formation varies in a range from 340 m to 1400 m.]


GeoJSON

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Fossils

None listed


Age 

Not given; but would be constrained as early-Late Cretaceous in the Cretaceous Lexicon entries. In contrast, the separate Jurassic Lexicon draft entry has inferred a latest Jurassic age, partly because it considered the Taoqihe Fm to be earliest Cretaceous, rather than Albian.

Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
91.65

    Ending stage: 
Coniacian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
88.28

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao