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Daheyan Formation

Daheyan Fm

Period: 
Permian

Age Interval: 
P1-P (7), Early Permian


Province: 
Xinjiang

Type Locality and Naming

The type section is section is located at Taoshuyuan 40 km to northwest of the Daheyan Railway Station, Tulufan (Turfan), Xinjiang. It was named by the Xinjiang Petroleum Administration in 1973. It was cited publicly by the Compiling Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region in 1981.


Lithology and Thickness

Conglomerate. Composed mainly of dark-brown thickly-stratified conglomerate and brown-red pebble-bearing coarse-grained sandstone, with its lower part being predominated by andesite. Thickness is 193 m.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Unconformable contact with the underlying upper Carboniferous Series (Aoertu Fm)

Upper contact

Conformable contact with the overlying Tarlang Fm

Regional extent

Distributed in the western part of the Tulufan Basin. In the Aivir Trench area above the red conglomerate there occurs still 110 m-thick grey-green thickly-stratified to massive conglomerate, but with no exposures of it having been found in the Taoshuyuan region.


GeoJSON

null

Fossils


Age 

Previously assigned (Permian Lexicon version, 2017) as early to early-Middle Permian (Cisualian to early Guadalupian epochs), but latest Carboniferous (Gzelian?) to mid-Sakmarian (lower Early Permian) according to Shuzhong Shen et al. (2019, Permian integrated stratigraphy and timescale of China)!

Age Span: 

    Beginning stage: 
Gzhelian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
303.68

    Ending stage: 
Sakmarian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
292.02

Depositional setting

It is interpreted as a river-lake facies deposit.


Depositional pattern:  


Additional Information


Compiler:  

Hou Jingpeng