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Bayanhua Gr

Bayanhua Gr

Period: 
Cretaceous

Age Interval: 
Berriasian-Albian, (17d)


Province: 
Inner Mongolia

Type Locality and Naming

Erlian Basin. "The Bayanhua Group, consisting of the Aershan Fm, Tenggeer Fm and Saihan Fm in ascending order, was deposited during the Early Cretaceous, is widely preserved in the basin, and constitutes the chief part of the basin-fill deposits." However, an uppermost Hadatu Fm is present in portions of the basin as described by Jingeng Sha (in Kosenko et al., 2021).


Lithology and Thickness

See component formations.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The Lower Aershan Fm rests on the Jurassic strata (e.g., Hugejiletu Fm) or on the early Cretaceous Xinganling Gr with an angular unconformity (named as T11 in seismic reflection sections).

Upper contact

"After the deposition of the Saihan Formation, a significant sedimentary hiatus occurred in most regions of the Erlian Basin. The Upper Cretaceous Erlian Fm was locally deposited in a few sub-basins in the northwestern basin, and the Saihan Fm (top formation in this Group) was overlain by the Erlian Fm or the Cenozoic sediments with angular unconformities. The unconformity between the Saihan Fm and Erlian Fm is named as T2 in seismic reflection sections, and the unconformity between the Saihan Formation and the Cenozoic strata is named as T0." Locally, there is an uppermost Hadatu Fm of sandstones-conglomerates in this Bayanhua Gr before that major hiatus.

Regional extent

Erlian Basin


GeoJSON

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Fossils


Age 

Guo, Z.X. et al. (2019, Early Cretaceous tectonostratigraphic evolution of the Erlian Basin, NE China, Marine and Petroleumm Geology, 110: 539-564) total span from 138 Ma to 100 Ma; hence, using GTS2020, latest Berriasian through Albian.However, the entire Bayanhua Gr is placed into only the Aptian-Albian by Kosenko et al. (2021), who did not reference Guo et al.'s study. Therefore, until this conflict is resolved, the age model for the Erlian Basin stratigraphy by Guo et al. (2019) is used here.

Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
138.78

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Guo, Z.X. et al. (2019, Early Cretaceous tectonostratigraphic evolution of the Erlian Basin, NE China, Marine and Petroleumm Geology, 110: 539-564)