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Yunshan-Cret Formation

Yunshan-Cret Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (21)


Province: 
Heilongjiang

Type Locality and Naming

E. Heilongjiang – Wandashan. Upper-Middle formation of Longwangzhang Gr. Named after Yunshan in Hulin County, Heilongjiang Province, by Heilongjiang Research Team of Mesozoic Coal-bearing Strata, 1986, Research on the Longzhaogou Group and Its Correlation with the Jixi Group of Eastern Heilongjiang Province, Harbin: Heilongjiang Science and Technology Press.

NOTE: There is also a "Yunshan" Formation of sandstone in middle Devonian of Jiangxi Province. Therefore, "Cret" appended to this one in Lexicon.


Lithology and Thickness

"The marine and nonmarine strata are composed of black mudstone, siltstone, fine- to medium-grained sandstone, coal, tuff, volcaniclastics and lava. Total thickness of the formation is about 2100 m."


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformably overlies the Qihulin Fm.

Upper contact

Conformably underlies the Zhushan Fm.

Regional extent


GeoJSON

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Fossils

"Plant, brachiopod, foraminifer, gastropod, bivalve and ostracod fossils have been found"


Age 

Initially was considered as Jurassic; now mid-Cretaceous.

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
117.30

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
113.20

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Descriptions copied from Futakami, M., et al. (1995) "Barremian ammonites from the Longzhaogou Group in eastern Heilongjiang, northeast China", Jour. Geol. Soc. Japan, 101: 79-85. Age span from D.P. Xi, X.Q. Wan et al. (2019; Cretaceous chapter of China Integrated Stratigraphy and Timescale).