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Heishidu Formation
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Heishidu Fm base reconstruction

Heishidu Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (29a)


Province: 
Anhui

Type Locality and Naming

Heifei Basin, south zone. Heishidu in Huoshan County, Anhui Province. Compiling Group for Anhui Regional Stratigraphic Scale, 1978, Regional Stratigraphic Scale of East China: Anhui Province, Beijing: Geological Publishing House. First appeared in a 1959 manuscript by Yang Zhijian.


Lithology and Thickness

Alternating beds of tuffaceous conglomerate, sandstone, siltstone and shales. Sandy conglomerates in lower part; fining-up to sandstones with thick silty claystones in upper part.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Xi et al. (2019) imply the next older unit is the volcanics of the Baidaban Fm.

Upper contact

Xi et al. (2019) imply it is coeval with Xiaotian Fm, but other papers put it as underlying the Xiaotian Fm (used here).

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[116.56,31.39],[116.68,31.47],[117.15,31.44],[117.21,31.17],[117.17,30.87],[117.06,30.67],[116.81,30.57],[116.51,30.49],[116.26,30.56],[116.05,30.78],[116.06,31.06],[116.27,31.37],[116.56,31.39]]]]}}

Fossils


Age 

Very uncertain; but in Aptian-Albian range. For graphic purposes, shown as Aptian and the Xiaotian Fm as Albian.

Age Span: 

    Beginning stage: 
Aptian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
118.12

    Ending stage: 
Aptian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
113.20

Depositional setting

Meandering river to shallow lacustrine


Depositional pattern:  


Additional Information


Compiler:  

Xi, D.P., Wan, X.Q, Li, G.B., Li, G. 2019. Cretaceous integrative stratigraphy and timescale of China. Science China Earth Sciences, 61, https://doi.org/10.1007/s11430-017-9262-y