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Shilu Gr
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Shilu Gr base reconstruction

Shilu Gr

Period: 
Neoproterozoic

Age Interval: 
Uncertain (Qingbaikouan-Nanhuan), Qb (71)


Province: 
Hainan

Type Locality and Naming

The Shilu Gr was named by the Hainan Team of Geology in 1964. The typical section is situated in Shilu Iron Mine in Hainan Island, Hainan Province.

Synonym: （石碌群）


Lithology and Thickness

The Shilu Gr is divided into six beds. First (lowest) bed is dominated by gray to dark gray quartzose schist and quartzite, the top is quartzose sericite schist, the bottom is not seen, and it is more than 215 m thick. Second bed composed of brown yellow diopside tremolite (metamorphosed sediment rich in dolomite and quartz) has a thickness of 50-100 m. Third bed consists of light gray or gray sericite-quartz schist and gray purple sericite schist, and is 306 m thick. Fourth bed consists of gray to light gray, medium- to thick-bedded quartzite intercalated with minor quartz-sericite schist, 103 m thick. Fifth bed is sericite schist and quartzose sericite schist with a maximum thickness of 450 m. Sixth (uppermost) bed is gray dolomitic crystalline limestone, dolomite and black carbonaceous slate intercalating diopsidite and tremolitite. Its top is incomplete and the thickness is more than 250 m.

[Figure: Outcrop photos of the Shilu Gr]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Overlies Baoban Gr on schematic stratigraphic column

Upper contact

Its top is incomplete. Next higher unit is Cambrian on schematic stratigraphic column

Regional extent

Shilu Iron Mine in Hainan Island, Hainan Province.


GeoJSON

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Fossils

There are abundant macroscopic fossils alga Chuaria circularis, Shouhsienia shouhsienensis, Tawuia dalensesis, T. sinensis etc.


Age 

Uncertain (Qingbaikouan-Nanhuan = Tonian-Cryogenian) on schematic stratigraphic column

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,000.00

    Ending stage: 
Cryogenian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
635.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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