Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Jialu Formation
Click to display on map of the Ancient World at:
Jialu Fm base reconstruction

Jialu Fm

Period: 
Neoproterozoic

Age Interval: 
earliest-Late Qingbaikouan (earliest-Late Tonian); Qb (52, 56)


Province: 
Guizhou

Type Locality and Naming

East Guizou. The Jialu Fm was named by the Guizhou Party of Regional Geological Survey in 1962, and was formally quoted on the Guidebook of 1: 200 000 Scale Geological Map of Yanhe Sheet in 1970. The typical section is situated in Jialu in Congjiang County and the reference section is in Furongba, Yinjiang County the northwest of Fanjing Mountain, Guizhou Province. Lower formation in the Xaijiang Gr.

Synonym: （甲路组）

[Figure: Type section of the Jialu Formation in the Fanjingshan Area (photos by Chen Jianshu)]


Lithology and Thickness

The Jialu Fm is subdivided into two members. Lower member (first member) in Furongba area northwest of Fanjing Mountain is composed of gray, purple gray and greenish gray meta-conglomerate, sandy conglomerate, blasto-sandstone. Southward in Jialu Congjiang County area, the base has minor meta-conglomerate, and the lower part is blasto-sandstone, siltstone intercalated with schist and phyllite. The middle to upper part is phyllite, schist intercalated with blasto-sandstone and siltstone, and the top occasionally intercalated with manganiferous slate. Upper member (second member) in the Furongba area is gray, dark gray or grayish purple slate intercalated with marble bearing stromatolites. In Jialu area, it consists of greenish gray, light gray calcareous phyllite and schist, phyllitic slate and marble. In Furongba area, it is 2 to 52 m thick, and in Jialu area in Congjiang County it varies from 670 to 921 m.

[Figure: The Stratigraphic column of the Xiajiang Gr. in Guizhou Province. A-Volcanic ash beds in the Jialu Formation and zircons from the ash bed.]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The Jialu Fm rests unconformably on the underlying Fanjingshan Gr (Duyangtang Fm)

Upper contact

Overlain by the Wuye Fm.

Regional extent

East Guizou. Fanjing Mountain, east Guizhou Province, and in southeast Guizhou


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[110.13,28.79],[110.31,28.8],[110.23,28.59],[109.9,28.22],[109.52,27.95],[107.88,26.31],[107.53,25.85],[107.22,26.1],[107.17,26.61],[107.43,26.96],[108,27.41],[108.67,27.88],[109.27,28.34],[110.13,28.79],[110.23,27.39],[110.11,27.15],[109.88,26.55],[109.51,26.03],[109.21,25.74],[108.75,25.05],[108.53,25.11],[108.24,25.29],[108.11,25.56],[108.18,25.72],[108.35,25.92],[108.56,26.16],[108.64,26.23],[109.08,26.51],[109.56,26.9],[110.23,27.39]]]]}}

Fossils


Age 

SHRIMP U-Pb date of 814.0±6.3 Ma (Gao Linzhi et al., 2010). Earliest-Late Qingbaikouan (mid-Late Tonian); for graphic purposes, the Xiajiang Gr of Late Qingbaikouan is divided into six sub-equal-duration formations.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.47

    Ending date (Ma):  
868.40

Depositional setting

The Jialu Fm was considered to represent a shelf to continental slope facies with an unstable thickness.


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.