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Mengtuan Formation
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Mengtuan Fm base reconstruction

Mengtuan Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous, K2mt (27c)


Province: 
Shandong

Type Locality and Naming

The Mengtuan Formation was erected by the Second Geological Team under the Shandong Bureau of Geology and Mineral Resources in 1994. The section for the designation is in Mengtuan of the Zhucheng city, Shandong (118°59′E; 36°01′N).

Synonym: Mengtong Fm


Lithology and Thickness

The Mengtuan Formation is represented by yellow green and purple red fine-grained sandstone interbedded with siltstone. It is 97.6 m thick.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Its base marked by purple red fine- and medium-grained sandstone is distinguished from gray purple grit with sandy conglomerate of the underlying Siqiancun Fm. The formation has a conformable contact to the Siqiancun Fm.

Upper contact

The formation contacts with the Wangshi Fm (= called the Jingangkou Fm in this Lexicon) by fault.

Regional extent

The formation occurs in the Mengtuan and Jiayue areas of the Zhucheng City. In Jingou-Xiejiazhuang of the Jiayue Town of the Zhucheng City, its lithology is exactly the same as that of the stratotype section. The formation is 299.2 m thick.


GeoJSON

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Fossils

The formation contains abundant sporopollen grains represented by the Schizaeoisporites- Classopollis- Tricolpites assemblage.


Age 

Shown in Chinese Lexicon as Aptian-Albian, but overlies the Siqiancun Fm which is underlain by the Tianjialou Fm that is now (Xi et al., 2019, Cret. Integrated Strat. Timescale China) assigned as upper Albian, therefore schematically shown as Turonian here.

Age Span: 

    Beginning stage: 
Turonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
93.90

    Ending stage: 
Turonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
89.39

Depositional setting

It is marked by lacustrine deposition.


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao