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Tuoli Formation
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Tuoli Fm base reconstruction

Tuoli Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1tl, (25c)


Province: 
Beijing

Type Locality and Naming

Xie Jiarong erected the Tuoli conglomerate in 1933. The reference section is from Dayuanshang to south of Majiafen through Gangshang in the Fangshan District of Beijing and the reference section 2 is at Zhangdian of the Fangshan District of Beijing. (borehole No. fengqian-2).


Lithology and Thickness

The Tuoli Formation is divided into two members, the upper and the lower. Lower member is mainly represented by brown sandy conglomerate. Upper member is purple gray sandy conglomerate. The formation is 766.4 m thick.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Its base marked by brown sandy conglomerate is distinguished from purple conglomerate and sandstone of the underlying XinzhuangBeijing Fm. It is a conformable contact.

Upper contact

Its top is bounded by the appearance of dark purple and variegated sandy conglomerate. It is a conformable contact.

Regional extent

The present formation mainly occurs in the Tuoli-Nanfang-Zhangzhuang hilly area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[117.36,40.98],[117.57,40.98],[117.82,40.91],[117.85,40.73],[117.71,40.51],[117.47,40.41],[117.15,40.27],[116.91,40.19],[116.54,40.17],[116.41,40.2],[116.27,40.3],[116.21,40.4],[116.24,40.54],[116.35,40.66],[116.56,40.79],[116.95,40.93],[117.36,40.98]]]]}}

Fossils

The formation yields bivalves Sphaerium jeholense, S. andersonni; ostracods Cypridea bona, C. angustricaudata.


Age 

Chinese lexicon strat column "20" shows as early 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: 
0.5

    Ending date (Ma):  
123.95

Depositional setting

It belongs to fluvial deposition


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao