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Hanjiadian Formation

Hanjiadian Fm

Period: 
Silurian

Age Interval: 
the lower Telychian of Llandovery (S1), (50)


Province: 
Guizhou, Sichuan

Type Locality and Naming

Ding Wenjiang (1930, in 1947) proposed the Hanjiadian Shale. The type section is located near Hanjiadian Village by the roadside from Songkan to Qijiang, 5 km north of the Tongzi County seat.

Synonym: (韩家店组); Hanchiatien Fm. Xiushan Fm (see Age)


Lithology and Thickness

The Hanjiadian Fm is dominated by grey green, yellow grey and blue grey mudstone and silty mudstone. Lower part, about 80 m thick, consists of yellow green and blue grey mudstone with rare fossils. Middle and Upper parts, 237 m in thickness, are composed of grey green, blue grey and yellow green mudstone and siltstone. With purplish red shale of 8 m in thickness at their base and show gradually increasing sandy and silty components towards their top.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

The Hanjiadian Fm rests conformably on the underlying Shiniulan Fm

Upper contact

It contacts disconformably to the overlying Liangshan Fm of the Permian. Regionally, the next younger unit is the mid-Devonian Wudang Fm.

Regional extent

The formation is mainly exposed in north Guizhou and south Sichuan.


GeoJSON

null

Fossils

Seldom horizons of the formation are fossil-bearing; some finds include: brachiopods Spirigerina, Isorthis, Striispirifer, Nalivkinia, Nucleospira, etc., trilobite Encrinuroides, Latiproetus, chitinozoa Ancyrochitina brevicollis, etc.


Age 

The formation has been placed in the Late Silurian and contrasted with the traditional Ludlow in age since its establishment, until the discovery of the Llandovery graptolite Stomatograptus sinnensis (Wang, 1965) from its lower part of the formation in Shiqian, and then separated it out from the Hanjiadian Fm and named it as Xiushan Fm corresponding to the late Llandovery to early Wenlock (Mu et al., 1974).

Age Span: 

    Beginning stage: 
Telychian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
438.59

    Ending stage: 
Telychian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
435.76

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wang Chuanshang and Wang Xiaofeng