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Tuolainanshan Gr

Tuolainanshan Gr

Period: 
Mesoproterozoic

Age Interval: 
Changchengian (Statherian)- Jixianian (Calymmian) Ch-Jx (11)


Province: 
Gansu, Qinghai

Type Locality and Naming

NW Gansu-south Qinghai border region (middle Qilian). The Tuolainanshan Gr was named by the No. 2 Party of Regional Geological Survey, Gansu Bureau of Geology in1974. The typical section is at Wugeshanhe- Wahusi Temple, Tulai Nanshan Mt., Gansu Province.

Synonym: （托来南山群）


Lithology and Thickness

The Tuolainanshan Gr is an extremely thick series of littoral clastic and neritic carbonate rock. It consists of the Nanbaishuihe Fm and Hua'erdi Fm in ascending order. [See entries for those formations for details.] The total thickness varies from 976 m to 4752 m.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

The lower boundary is unknown, but in regional scope it overlaps unconformably on different stratigraphic units, namely on the Aoyougou Fm and on the Huashugou Fm of Zhulongguan Gr from southeast to northwest direction..

Upper contact

Disconformably overlain by the Qitadaban Fm of lower Qingbaikouan.

Regional extent

NW Gansu-south Qinghai border region (middle Qilian). The group is widely distributed at Tulai Nanshan Mt., Shule-nanshan Mt., Daxue Mt., Yemananshan Mt., in central sector of Qilian Mts., as well as in east sector of Altun Mts.


GeoJSON

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Fossils

It bears rich stromatolites and microplants.


Age 

Schematic stratigraphic column shows it spanning the late Changchengian (late Statherian) through Jixianian (Calymmian)

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.65

    Beginning date (Ma): 
1,670.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
1,400.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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