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Wulantataer Formation

Wulantataer Fm


Period: 
Paleogene

Age Interval: 
Early Oligocene , (12a)


Province: 
Inner Mongolia

Type Locality and Naming

Central-Eastern Inner Mongolia. The naming section is located on the southern (right) bank of the Ulantatal Gully ~40 km northwest of Bayan Hot, Alxa Left Banner, Inner Mongolia. Named by Wang Peiyu and Wang Banyue in 1992.

Synonym: Ulantatal Fm


Lithology and Thickness

Mainly a sequence of brownish red, orange-yellow sandy mudstone with lacustrine fine clastic rocks of muddy sandstone, containing abundant concretions and gypsum. The thickness is ~100 m.


Lithology Pattern: 
Gypsiferous claystone


Relationships and Distribution

Lower contact

It possibly has a disconformable contact with the underlying later Eocene (Huerjing Fm).

Upper contact

It possibly has an unconformable contact with the overlying upper Miocene or Quaternary at different localities respectively. Regionally, next younger unit is the Damiao Fm ?

Regional extent


GeoJSON

null

Fossils

This formation yields abundant fossil mammals and those that have been studied mainly include more than 30 species such as Palaeoscaptor acridens, Amphechinus rectus, Ordolagus teilhardi, Desmatolagus pusillus, Sinolagomys kansuensis, Anomoemys lohiculus, Tsaganomys altaicus, Parasminthus tangingoli, Gobisminthus qiui, Shamosminthus tongi, Tataromys ulantatalensis, Leptotataromys gracilidens, Palaeogale sectoria and Eumeryx culminis, of which ~10 species are the same as those in the typical early Oligocene Hsanda Gol fauna in Asia.


Age 

The age of this formation was suggested to be Middle Oligocene in the past, but Wang et al. (2019) inferred it was Early Oligocene.

Age Span: 

    Beginning stage: 
Rupelian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
33.90

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
26.01

Depositional setting

It is suggested to lacustrine deposits.


Depositional pattern:  

Additional Information


Compiler:  

Tao Deng, Yuanqing Wang, Qian Li, et al.