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Banzifang Formation
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Banzifang Fm base reconstruction

Banzifang Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (20) K1bz


Province: 
Heilongjiang

Type Locality and Naming

The Banzifang Formation was named by the Heilongjiang Geological Bureau in 1989. The type locality is the Chuifeng – Atinghe section in Wuyiling of the Yichun City.


Lithology and Thickness

The Banzifang Formation is a group of volcanic rocks, mostly tuff and volcanic clastic rocks. It is 839.70 m thick at type locality and 233-140 m generally.


Lithology Pattern: 
Volcanic ash


Relationships and Distribution

Lower contact

It unconformably contacts the underlying strata. Next older regional unit is the Taoqihe Fm conglomerate. [HOWEVER -- Kosenko et al. (2021) do not indicate a Ningyuancun Fm for Banzifang Fm, but imply a major discontinuity of the Yongancun Fm onto the mid-Cretaceous Taoqihe Fm.]

Upper contact

It unconformably contacts the overlying Ningyuan Fm (Ningyuancun Fm)

Regional extent

The Banzifang Formation is distributed in the Yichun and Jiayin area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[128.41,49.48],[129.07,49.23],[129.9,48.71],[129.88,48.46],[129.85,48.17],[130.17,47.87],[130.14,47.68],[129.85,47.56],[129.32,47.54],[128.56,47.74],[127.99,47.92],[127.43,48.18],[126.91,48.4],[126.36,48.84],[126.23,49.29],[126.27,49.56],[126.65,49.73],[127.08,49.56],[127.61,49.5],[128.41,49.48]]]]}}

Fossils

None listed


Age 

Not given; but is constrained as early-Late Cretaceous.

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: 
0.5

    Ending date (Ma):  
91.65

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao