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Yangcaogou Formation

Yangcaogou Fm

Period: 
Triassic

Age Interval: 
Late Triassic, (TJ62)


Province: 
Liaoning

Type Locality and Naming

The name locality is located near Yangcaogou Village, southeast of Beipiao, Liaoning. Named by the Census Team of Liaoxi Brigade of Liaoning Coal Administration in 1962.

Synonym:


Lithology and Thickness

The Yangcaogou Formation is mainly composed of gray-green sandstone, shale and a small amount of conglomerate, with carbonaceous shale and thin coal lines. The named Yangcaogou Formation is composed of a coal-bearing clastic rock series with a thickness of about 100 m in the Lower part and a yellow-brown coarse sandstone with a thickness of more than 300 m in the Upper part. The thickness is 405.21 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The conglomerate at the bottom of the Yangcaogou Fm is in unconformity contact with the underlying Mesoproterozoic Gaozhuang Fm of white flint-band limestone.

Upper contact

Not given

Regional extent

This Formation is mainly distributed in the Yangcaogou area of Beipiao, Liaoning (the edge of the Jinlingsi-Yangshan Basin).


GeoJSON

null

Fossils

Plant fossils are mainly produced in the lower gray-green siltstone and shale, mainly including Glossophyllum shensiense, Neocalamites rugosus, Cycadocarpidium erdmanni, Danaeopsis sp. etc. Contain bivalves: Ferganoconcha burejensis, Shaanxiconcha dilatata, Unio sp. and so on.


Age 

The age had been assigned as Early Jurassic. In 1978 and 1983, Mi Jiarong believed that the rock assemblage characteristics of the upper strata of this Formation were different from those of the lower part, and it seemed inappropriate to belong to this Formation. In 1982, Qu Lifan and Pu Rongqian described sporopollen fossils at the same level, and the opinion of the age is the Late Triassic. Mi Jiarong et al. (1983) believed that the upper part should be separated from the lower part, the upper part is the Early Jurassic, and the lower part is the Late Triassic. Schematic stratigraphic columns shows as spanning Late Triassic.

Age Span: 

    Beginning stage: 
Carnian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
237.00

    Ending stage: 
Rhaetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
201.36

Depositional setting

This Formation is a mountain river sedimentary environment, which is composed of river bed facies, floodplain facies and flood marsh facies.


Depositional pattern:  


Additional Information


Compiler:  

Cao Hongsheng, Zhang Shiyan and Tong Jinnan.