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Jiufengshan Formation
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Jiufengshan Fm base reconstruction

Jiufengshan Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (20) K1jf


Province: 
Inner Mongolia, Heilongjiang

Type Locality and Naming

Jiayin/Hailar Basin region. The Jiufengshan Formation was named by Li Chaochen (1973) in Oroqen of Nei Mongol. The Type locality is the Jiufengshan – Shuanghao section in Dayangshu, Oroqen of Inner Mongolia. See entry for Ganhe Fm on history. Middle formation in Xinganling Gr version in this region.


Lithology and Thickness

The Jiufengshan Formation is composed of dark-grey to black basalts, grey, greyish-green, or off-white tuffs, tuffaceous breccias, tuffaceous sandstones, fine-grained sandstones and siltstones, dark-grey to off-white conglomerates, pebbly sandstones, siltstones and mudstonesinterbedded by coal beds. It is 662.04 m thick at the type section.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It has an unconformable contact onto the underlying Longjiang Fm.

Upper contact

It has an unconformable upper contact to the overlying Ganhe Fm.

Regional extent

The Jiufengshan Formation is distributed in Inner Mongolia and Heilongjiang area.


GeoJSON

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Fossils

The Jiufengshan Formation yields plant mega- and micro-fossils and conchostracans. Plant fossils are Czekanowskia rigida, C. sp., Zamites sp., Cephalotaxopsis sp., Pityophyllum lindstroemi, P. nordenckioldi, Podozamites sp., Coniopteris sp., Pterophyllum sp., Ginkgo cf. digitata, Podozamites lanceolatus, Elatocladus sp., Czekanowskia sp., Equisetites sp.


Age 

Both the rock and fossil (particularly the typical Jehol Biota: Eosestheria - Ephemeropsis - Lycoptera fauna) associations in the group indicate that the Xinganling Gr (Xing'anling Gr) in this region characterized by the Longjiang Fm, Jiufengshan Fm, Ganhe Fm correlates with the Yixian Fm and Huoshiling Fm. Therefore, the Xing'anling Group (in this region!) is mainly Barremian.

Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
126.50

    Ending stage: 
Barremian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
124.97

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao

Enhanced with Igor N. Kosenko, Jingeng Sha and Boris N. Shurygin (2021). Upper Mesozoic stratigraphy of Sikhote-Alin (Russian Far East) and northeastern China: Non-marine and marine correlations. Part 1: Upper Jurassic-Hauterivian AND 2. Barremian-Aptian. Cretaceous Research, 124: articles 104811 (https://doi.org/10.1016/j.cretres.2021.104811) AND 104812 (https://doi.org/10.1016/j.cretres.2021.104812)