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Taizhou Formation
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Taizhou Fm base reconstruction

Taizhou Fm

Period: 
Cretaceous, Paleogene

Age Interval: 
Late Cretaceous – Paleocene, K2-E1t, (30)


Province: 
Jiangsu

Type Locality and Naming

Subei Basin. The Taizhou Formation was named by the Nanjing Institute of Geology and Paleontology in 1961. The type locality is in the Taiozhou City of Jiangsu. The key section is down the borehole Tai-1 at eastern Taiozhou City (119°55'E, 32°29'N).


Lithology and Thickness

The Taizhou Formation is divided into 2 members. Lower member is composed of brownish yellow thin- to medium-grained sandstone, brownish red muddy sandstone and sandy mudstone. Upper member is grayish green, grayish yellow and brownish red mudstone intercalated with siltstone.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The formation conformably overlies the Chishan Fm.

Upper contact

The formation unconformably underlies the Funing Fm.

Regional extent

The Taizhou Formation crops rarely out in surface, is only described in boreholes of the Taizhou area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[119.52,34.43],[120.16,34.43],[120.44,34.13],[120.63,33.78],[120.82,33.28],[120.83,32.86],[121.49,32.24],[122.02,31.83],[122.19,31.27],[121.9,30.81],[121.48,30.74],[121.12,30.8],[120.86,31.01],[120.71,31.11],[120.65,31.44],[120.77,31.68],[120.29,31.67],[120.03,31.59],[119.69,31.5],[119.48,31.46],[119.38,31.52],[119.17,31.72],[118.79,31.93],[117.93,32.26],[117.71,32.55],[117.9,33.13],[118.19,33.9],[118.56,33.99],[119.15,34.13],[119.52,34.43]]]]}}

Fossils

The lower member is uppermost Cretaceous in age; the upper member belongs to the Paleocene. The lower member yields Cretaceous fossils of spore and pollen Gothanipollis sp., Gabonisporis sp., Rugubivesiculites sp., Jianghanpollis sp., Pterisisporites sp., Ephedripites sp.; ostracods Mongolocypris sp., Talicypridea sp., Quadracypris sp., Cypridea sp., Candona sp.; charophyte Grambastichara yuntaishanensis, Achistochara sp.; gastropods Goniobasis jiangxiensis, Pachychiloides macilent.


Age 


Age Span: 

    Beginning stage: 
Maastrichtian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
72.17

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
66.04

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao