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Hashihar Formation
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Hashihar Fm base reconstruction

Hashihar Fm

Period: 
Neoproterozoic

Age Interval: 
middle Qingbaikouan (middle Tonian), Qb （14）


Province: 
Qinghai, Gansu

Type Locality and Naming

Middle Qilian (north-central Gansu-Qinghai border region). The Hashihar Fm was named by Qian Jiagi et al. in 1981. The typical section is located in Hashihar to Yaodong valley (Shibao Township) in Subei County, Gansu Province.

Synonym: （哈什哈尔组）


Lithology and Thickness

The Hashihar Fm is dominated by gray, grayish purple and black sandy slate, siltstone intercalated with sandy limestone, fine-grained quartzose sandstone, tuffaceous siltstone, slate, and pyroclastic rock, with thin-to medium- bedded rhythmic successions. The thickness varies from 379 to 937 m: in north it is 749 m, at Chaganburgas 680 m, and eastward to Wugeshan area with the increasing of pyroclastic rock it is 937 m. Upper-middle formation in Gongcha Gr.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

The lower part rests conformably on the underlying Wugeshan Fm

Upper contact

The upper part is conformably overlain by the Yaodonggou Fm

Regional extent

Middle Qilian (north-central Gansu-Qinghai border region). The Hashihar Formation is distributed in North Qilian and Middle Qilian, including Yaodong valley, Daliugou, Dagongcha, Gulangxia (in Subei, Gansu) and Wugeshan in Tulai pasture (in Qinghai).


GeoJSON

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Fossils

The Hashihar Formation yields abundant microplants, dominated by Trematosphaeridium holtedahlii, Trachysphaeridium incrassatum, T. simplex, T. cf. rugosum, T. cf. stipticum, Asperatopsophosphaera partialis, Pseudozonosphaera verrucosa, Lophosphaeridium gibberosum, etc. and stromatolites Gymnnosolen f. etc.


Age 

middle Qingbaikouan (middle Tonian)

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: 
0.6

    Ending date (Ma):  
832.00

Depositional setting


Depositional pattern:  


Additional Information

The paleolatitude is north 32.5° and the paleomagnetic pole is -6° ψ, 237.6 λ.


Compiler:  

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