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

Amunik Fm

Period: 
Devonian

Age Interval: 
D3 (18); Late Devonian


Province: 
Qinghai

Type Locality and Naming

The type section is located at Amunik Mt., southeast of Xitieshan and southwest of Delingha, in the northern margin of Qaidam Basin, Qinghai Province. It was named by Qinghai No 1 Team of Regional Geological Survey in 1976.


Lithology and Thickness

Sandstone, conglomerate. The formation is mainly characterized by purple, grayish-purple, gray, yellowish-pink arkosic quartzose sandstone and silty mudstone. At the bottom is a bed of purple conglomerate about 2 m thick. The composition of the conglomerate is mainly chert, volcanic rock and limestone, with the pebbles being 2-4 cm in diameter, angular to subangular in shape and cemented with sands. In Amunik section, the formation is 116 m in thickness.


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Disconformable contact with the underlying Maoniushan Fm.

Upper contact

Conformable or disconformable contact to the overlying Chengqianggou Fm of Lower Carboniferous.

Regional extent


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[94.26,36.42],[96.3,36.12],[98.04,35.99],[98.23,36.7],[95.05,37.37],[94.26,36.42]]]]}}

Fossils


Age 

Late Devonian

Age Span: 

    Beginning stage: 
Famennian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
371.10

    Ending stage: 
Famennian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
359.30

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)