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Donglingtai Formation
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Donglingtai Fm base reconstruction

Donglingtai Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1dlt, (25c)


Province: 
Beijing

Type Locality and Naming

The name of the Donglingtai Formation originated from Chen Kai and Xiong Yongxian (1935). Both the type locality and key section is in Dongling of the Mentougou District, Beijing.


Lithology and Thickness

The Donglingtai Formation is a group of volcanic-sedimentary deposits. It is mostly composed of brownish gray, grayish black volcanic clastic rocks and lava. The formation can be divided into 4 members in ascending order. Member 1 is dominated by basaltic andesite, andesite intercalated with rhyolite tuff; Member 2 consists of conglomerate, sandstone, tuffaceous sandstone with intercalations of rhyolite tuff; Member 3 is rhyolite, interbedded by rhyolite tuff and tuff; the member 4 of rhyolite, andesite interbedded with tuff. The formation is about 5000 m in thickness.


Lithology Pattern: 
Lava


Relationships and Distribution

Lower contact

The Donglingtai Formation is unconformably overlying the Tuchengzi Fm.

Upper contact

The contact with the Donglanggou Fm is obscure.

Regional extent

It is distributed in the Mentougou and Huairou districts, Beijing.


GeoJSON

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Fossils

The tuffaceous sandstone beds in the member 2 yields plant fossil Neocalamites sp.


Age 

Fossil data are not evidenced for age. The Rb-Sr isotopic age shows 139.5 Ma (Sun Shanping, 1988). The formation is on the lowermost Cretaceous Tuchengzi Fm and it can be correlated with the Early Cretaceous Zhangjiakou Fm volcanic rocks in north Hebei. It is indicated that the age of the formation belongs to the earliest Cretaceous. Zhangjiakou Fm volcanics are ca. 132–129 Ma (Valanginian); so that assignment is used here. [Note: for graphic purposes of a Beijing column, inserted here instead of the upper part of the Donglanggou Fm of Berriasian (using Chinese lexicon strat column assignment).]

Age Span: 

    Beginning stage: 
Valanginian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
136.17

    Ending stage: 
Valanginian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
133.62

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao