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Tongbomiao Formation
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Tongbomiao Fm base reconstruction

Tongbomiao Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (18) K1tb


Province: 
Inner Mongolia

Type Locality and Naming

Hailar Basin. Middle formation of the Xinganling Gr. The Tongbomiao Formation was named by the Conference of Hailar basin Stratigraphy in 1990. The type locality is the Haican 3 Well.


Lithology and Thickness

The Tongbomiao Formation is a group of multi colored sandstone and conglomerate, greenish grey sandstone, thin bedded siltstone, greyish white tuffaceous coarse-grained sandstone, with coal bed intercalations. The maximum thickness is 1535 m. "The Tongbomiao Formation is dominated by alluvial fan, fan delta, and fluvial sandstones and sandy conglomerates with locally preserved lacustrine mudstones and siltstones. … Moreover, the Tongbomiao and Nantun formations contain abundant volcanic rocks that were produced during the climax of volcanism and rifting." (Ji et al., 2020).

Synonym: uncertain due to lack of standardization (see Additonal Info in Xinganling Gr entry); but might be Longjiang Fm as equivalent in this same Hailar Basin?


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Disconformity (ca. 5 Myr hiatus) on Tamulangou Fm (Oxfordian to mid-Tithonian). "This Tamulangou Formation, which mainly consists of alluvial fan conglomerates, shallow lacustrine mudstones, and interbedded intermediate-basic lavas and volcaniclastic rocks, is discontinuously distributed in the HTB." (Ji et al., 2020)

Upper contact

Disconformity with overlying Nantun Fm.

Regional extent

It distributed in the area of eastern Inner Mongolia and western Heilongjiang. The Tongbomiao Fm and Nantun Fm are widely distributed in the Hailar Basin and constitute the main part of the basin fill.


GeoJSON

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Fossils

None listed


Age 

[Zheng Ji et al. (2020, " Chronostratigraphic framework of late Mesozoic terrestrial strata in the Hailar–Tamtsag Basin, Northeast China, and its geodynamic implication", Geol. Jour.) conclude that the formation spans ca. 143 to 135 Ma => Berriasian through early Valanginian.]

Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
143.10

    Ending stage: 
Valanginian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
134.13

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao

Enhanced with Igor N. Kosenko, Jingeng Sha and Boris N. Shurygin (2021). Upper Mesozoic stratigraphy of Sikhote-Alin (Russian Far East) and northeastern China: Non-marine and marine correlations. Part 1: Upper Jurassic-Hauterivian AND 2. Barremian-Aptian. Cretaceous Research, 124: articles 104811 (https://doi.org/10.1016/j.cretres.2021.104811) AND 104812 (https://doi.org/10.1016/j.cretres.2021.104812)