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Aertaxi Gr
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Aertaxi Gr base reconstruction

Aertaxi Gr

Period: 
Devonian

Age Interval: 
D22 (15); Givetian (late Middle Devonian)


Province: 
Xinjiang

Type Locality and Naming

Western Tarim Basin. The type section is located at south of A’ertaxi village, north side of Kunlun Mts. in the Xinjiang Uygur Autonomous Region. . It was named by No 13 Geological Team of Xinjiang in 1957 and was published by Editorial Board of Xinjiang Regional Stratigraphical Scale (1980).

Synonym: A'ertaxi Gr


Lithology and Thickness

Limestone, shale. The Lower part of the Group is dominated by light-gray, dark-gray limestone and clayey shale, containing coral fossils. The Upper part is characterized by green and black shale and dark-gray limestone with breccia limestone on its top. The thickness is 870 m. In the high mountain area between Longle-Agar River valley and Genlishalihe River, the group is characterized by gray, light greenish-gray quartzose sandstone, 260 to 900 m thick.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Unknown: The contact relationships to the underlying strata are not yet clear. Column 15 shows a Sukuluk Gr below, but there is no entry for this in the English-version of the Lexicon.

Upper contact

Unknown: The contact relationships to the overlying strata are not yet clear. However, Qizinafu Gr is shown overlying in column 15).

Regional extent


GeoJSON

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Fossils

Coral fossils: Eudophyllum sp., Brariphyllum sp., Syringopora sp., Temnophyllum sp..


Age 

Givetian (late Middle Devonian)

Age Span: 
S

    Beginning stage: 
Eifelian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
394.30

    Ending stage: 
Givetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
378.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

(Wang Shitao)