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
Pake Formation
Click to display on map of the Ancient World at:
Pake Fm base reconstruction

Pake Fm

Period: 
Neoproterozoic

Age Interval: 
mid-Qingbaikouan through Sinian (mid-Tonian through Ediacaran), Pt3 (37)


Province: 
Yunnan

Type Locality and Naming

Westernmost Yunnan. The Pake Fm was named by the Yunnan Party of Regional Geological Survey in 1982 (Guidebook of 1: 200 000 Scale of Geological Map of Menglian Sheet). The typical section is situated in Pake village south of Ximeng County, Yunnan Province.

Synonym: （帕可组）


Lithology and Thickness

The Pake Fm is subdivided into two lithological members. Lower member is composed of dark gray to gray biotite marble, tremolite marble, mica-quartz schist and leptite, with a thickness of 380 m. Upper member is composed of dark gray to black biotite quartz schist, greenish gray hornblende schist and two-mica albite quartz schist (base not seen) with a thickness of 270 m. It is over 600 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Unconformable onto the underlying Damenglong Gr (Mesoproterozoic underlying all of West Yunnan)

Upper contact

The top has a faulted contact with the Wangya Fm

Regional extent

Westernmost Yunnan.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[98.93,26.86],[99.05,26.03],[99.35,25.33],[99.78,24.71],[100.2,24.22],[99.7,23.93],[99.46,23.74],[99.07,23.48],[98.91,23.5],[98.81,23.88],[98.84,24.51],[98.8,25.37],[98.93,26.86]]]]}}

Fossils


Age 

Entire mid-Qingbaikouan through Sinian (mid-Tonian through Ediacaran) span given on schematic stratigraphic column – dotted.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
888.00

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
538.80

Depositional setting


Depositional pattern:  


Additional Information

The Pake Formation was intruded by the Laojiezi granitic intrusive, which dated as 687 Ma, so it was considered as belonging to the Neoproterozoic.


Compiler:  

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