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Luotuoling Formation
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Luotuoling Fm base reconstruction

Luotuoling Fm

Period: 
Neoproterozoic

Age Interval: 
middle Qingbaikouan (middle Tonian), Qb (18, 19)


Province: 
Beijing, Liaoning, Shandong, Hebei

Type Locality and Naming

The Luotuoling Fm was named by Xing Yusheng in 1982. The typical section is situated in Luotuoliang to Laoguading section of the Qingbaikouan System, north of Jixian City in Tianjin Municipality.

Synonym: （骆驼岭组）


Lithology and Thickness

The Luotuoling Fm is dominantly composed of pebbly arkose, quartzose sandstone, glauconitic sandstone and variegated shale, and subdivided into two lithologic members. The basal part of the First member is pebbly sandstone and conglomerate, with the pebbles generally bearing limonite coatings and poorly sorted, and cemented by ferruginous or argillaceous matter. The Second member is dominated by variegated shale, bearing flat and wavy beddings, and the basal part is shale intercalated with lenses of glauconitic sandstone and arkose. The sandstone in this formation bears large bidirectional cross-beddings, flat-beddings or wavy beddings and has fining-upward features. The formation has a thickness of 118 m. [See Depositional setting for facies interpretation.]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The lowermost part is yellowish gray coarse-grained pebbly quartzose sandstone, which rests disconformably on the underlying Xiamaling Fm (see figure). But in Tangshan, Luanxian and Laiyuan area of the basin periphery, it can overlap onto the older strata (Wumishan Fm, Puyu Fm).

[Figure: The boundary between the Luotuoling Formation and the underlying Xiamaling Formation]

Upper contact

The upper part is greenish gray shale or siltstone, which disconformably overlain by the Jing'eryu Fm.

Regional extent

The Luotuoling Formation is widely distributed in Zhuolu, Yuxian, Laiyuan, Luanxian, Yixian, Xinglong, Jixian counties and also in Kuancheng and Renqiu counties.


GeoJSON

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Fossils

Besides the fossils of Chuaria circularis, the shale in Longfengshan of Huailai County was discovered to yield Vendotenia sp., Shouhsiennia shouhsienensis, Longfengshania sp. etc. and microplants Orygmatosphaeridium sp. etc.


Age 

Middle Qingbaikouan (middle Tonian) is schematically implied by the generalized stratigraphic column.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
944.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
860.00

Depositional setting

The lower member is interpreted as a river facies derived from a low-water system tract (LST). The upper member is interpreted as a transgressive system tract (TST). Sedimentary structures in the sandstones are interpreted as littoral sandbank to lagoon facies.


Depositional pattern:  


Additional Information

The K-Ar ages on glauconite include 855 Ma, 870 Ma and 890 Ma.


Compiler:  

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