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Xiaotian Formation
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Xiaotian Fm base reconstruction

Xiaotian Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (29a)


Province: 
Anhui

Type Locality and Naming

Heifei Basin, south zone. Xiaotian in Shucheng County, Anhui Province. Anhui Bureau of Geology and Mineral Resources (Li Yufa, Jiang Lifu ed.), 1997, Multiple Classification and Correlation of the Stratigraphy of China (34), Stratigraphy (Lithostratic) of Anhui Province, Wuhan: China University of Geosciences Press, 204. First appeared in a 1973 manuscript by No.327 Anhui Geology Team.


Lithology and Thickness

Tuffaceous conglomerate and sandstone alternation with grayish green muddy siltstone and calcareous mudstone, and with thick-bedded conglomerate at the base. Lower part is interbedded with thin layers of siltstone and fine sandstone.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

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

Upper contact

Unconformably overlain with angular unconformity by purple-red thick sandy conglomerates of Cenozoic. Xi et al. (2019) indicate the next higher regional unit is the uppermost Cretaceous Qijiaoqiao Fm (no details available).

Regional extent


GeoJSON

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Fossils


Age 

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

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
113.20

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
105.58

Depositional setting

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