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Yangjiazhuang Formation
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Yangjiazhuang Fm base reconstruction

Yangjiazhuang Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, K1yjz (27b)


Province: 
Shandong

Type Locality and Naming

Jiaolai Basin. The Yangjiazhuang Formation was erected by the Regional Geological Team of the Shandong Bureau of Geology and Mineral Resources in 1991. The section for the designation is in Yanjiazhuang of the Gaomi City. The reference section is the Lijiazhuang – Sujiabo section cross the Gaomi and Jiaozhou cities (119°37′E; 36°13′N).


Lithology and Thickness

The Yangjiazhuang Formation is built up by yellowish gray and greenish gray medium-grained feldspar sandstone, siltstone intercalated with gravel-bearing sandstone and siltstone. The thickness varies in different regions. The maximum thickness is up to 4699 m in eastern Shandong, and to 712 m in western Shandong.


Lithology Pattern: 
Fine-grained sandstone


Relationships and Distribution

Lower contact

Shown as diachronously overlying the Zhifengzhuang Fm in strat column of Xi et al. (2019).

Upper contact

It unconformably underlies the Qugezhuang Fm (and/or the Houkuang Fm?)

Regional extent

The Yangjiazhuang Formation is wide distributed in Shandong.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[120.41,36.39],[120.37,36.21],[120.26,35.98],[119.73,35.63],[119.35,35.3],[119.24,35.22],[119.18,35.22],[119.19,35.3],[119.23,35.53],[119.3,35.79],[119.4,36.01],[119.49,36.08],[119.79,36.31],[120.06,36.5],[120.28,36.52],[120.41,36.39]]]]}}

Fossils

None listed


Age 


Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
130.77

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
0.1

    Ending date (Ma):  
120.58

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao