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Xiangyangsi Formation
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Xiangyangsi Fm base reconstruction

Xiangyangsi Fm

Period: 
Devonian

Age Interval: 
D1 1-2 (29), Lochkovian to Pragian (Early Devonian)


Province: 
Yunnan

Type Locality and Naming

The type section is located at Xiangyangsi, west of Shidian County of Yunnan Province. It was named by No. 3 Geological Team of Yunnan Geological Survey in 1980, and was published in 1982 by Tan Xuecun, Dong Zizhong and Qin Dehou.


Lithology and Thickness

Calcareous shale. The Formation is characterized by purplish-red, grayish-green calcareous shale, nodular micrite and few clayey and silty limestones. It is 150 m thick.


Lithology Pattern: 
Pelagic marl


Relationships and Distribution

Lower contact

It rests conformably on the Niushiping Fm (Silurian) with the first appearance of shale as its lower boundary.

Upper contact

Regional extent

The Formation is mainly distributed in Baoshan-Shidian area.


GeoJSON

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Fossils

It contains crinoid Camarocrinus cf. subornatus,

graptolites Monograptus cf. uniformis angustidens, M. micoden;

conodont Ozarkodina r. remscheidensis; and

brachiopoda Plectodonta sp., Yunnanoleptaena sp.


Age 

Lochkovian to Pragian (Early Devonian); Lochkovian (Qie et al., 2019)

Age Span: 

    Beginning stage: 
Lochkovian

    Fraction up in beginning stage: 
0

    Beginning date (Ma): 
419.00

    Ending stage: 
Lochkovian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
413.06

Depositional setting

It is interpreted as a relatively deep-water basin setting.


Depositional pattern:  


Additional Information


Compiler:  

Xian Shiyuan & Wen Du- modified from Qie, Wenkun, Xueping Ma, Honghe Xu, Li Qiao, Kun Liang, Wen Guo, Junjun Song, Bo Chen, and Jianfeng Lu. 2019. Devonian Integrative Stratigraphy and Timescale of China. Science China Earth Sciences 62 (1): 112–34. https://doi.org/10.1007/s11430-017-9259-9.