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Hadatu Formation
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Hadatu Fm base reconstruction

Hadatu Fm

Period: 
Cretaceous

Age Interval: 
Albian, (17d)


Province: 
Inner Mongolia

Type Locality and Naming

Erlian Basin. "The Bayanhua Gr, 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

" It mainly comprises alternating grey to off-white sandstones, conglomerates, grits and siltstones, and grey, greyish-green and brownish-red mudstones rarely intercalated with thin-bedded coals or carbonaceous clays"


Lithology Pattern: 
Coarse-grained sandstone


Relationships and Distribution

Lower contact

Rests unconformably on the Saihantala Fm (= Saihan Fm).

Upper contact

"After the deposition of the Saihan Fm [or locally the Hadatu Fm], 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 … unconformity between … is named as T2 in seismic reflection sections" (see entry in Saihan Fm for more details).

Regional extent


GeoJSON

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Fossils

It yields spores and pollen grains, a Porusphaera erenensis acritarch assemblage, and the rare brackish-water dinocyst Paucibucina pylophora (Sha, 2007a).


Age 

"This formation is probably mainly Albian but may range down into the Aptian, a determination that is not significantly in conflict with that of Lang et al. (1999), who dated it as Aptian. It can be correlated with the Huashan Group and the Sunjiawan Formation based on its stratigraphic position."

Age Span: 

    Beginning stage: 
Albian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
106.85

    Ending stage: 
Albian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
100.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

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)