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BilutuBed Formation

BilutuBed Fm

Period: 
Neogene

Age Interval: 
Late Miocene (Messinian), N1 , (12b)


Province: 
Inner Mongolia

Type Locality and Naming

The type section is located at Dahongshan (big red hill) (E113°54′, N43°20′), about 60 km southeast of Sonid Zuoqi county, Xilinhot City, central Nei Mongol. It was named by Wang et al. (2009).


Lithology and Thickness

The Bilutu Bed is characterized by a layer of gravel bed with pedogenic carbonate nodules. It contains abundant mammalian fossils. Its thickness is about 2 m.


Lithology Pattern: 
Soil


Relationships and Distribution

Lower contact

In the type section, the Bilutu Bed is the capping gravel bed in Aoerban exposures, and is in disconformable or unconformable contact with the underlying orange red siltstones of the Upper Miocene BalunhalagenBed Fm.

Upper contact

In the type section, the Bilutu Bed is the capping gravel bed in Aoerban exposures. Next younger regional unit is the Haerebo Fm.

Regional extent

It is restricted in Aoerban area, Sonid Zuoqi County.


GeoJSON

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Fossils

Mammals: Mioechinus cf. M. gobiensis, Erinaceus sp., Proscapanus sp., Quyania sp., Yanshuella sp., Heterosoricinae indet., Soricinae indet., Ansomys Borealis, A. lophodens, Tamias ertemtensis, Spermophilinus mongolicus, Sciurus sp., Atlantoxerus orientalis, Prospermophilus orientalis, Pliopetaurista cf. P. rugosa, Orientiglis wuae, Miomimus cf. M. sinensis, Keramidomys fahlbuschi, K. magnus, Leptodontomys gansus, L. lii, Sicista ertemteensis, Heterosminthus orientalis, Lophocricetus xianensis, L. grabaui, Protalactaga grabaui, Paralactaga suni, P. parvidens, Dipus faudator, Metaeucricetodon mengicus, Democricetodon lindsayi, Megacricetodon sinensis, Cricetodon fengi, Plesiodipus leei, P. progressus, P. robustus, Gobicricetodon robustus, G. arshanensis, Khanomys cheni, Sinocricetus zdanskyi, S. progressus, Nannocricetus primitivus, N. mongolicus, Kowalskia neimengensis, K. similis, Microtoscoptes fahlbuschi, Microtodon sp., Anatolomys sp., Pseudomeriones abbreviates, Hansdebruijnia pusilla, Karnimatoides hipparionus, Micromys chalceus, Desmatolagus? sp., Bellatona sp., Ochotona cf. O. lagreli. (Wang et al., 2009; Qiu and Li, 2016).


Age 

Based on the faunal mammals, the age of the Bilutu Bed was considered as be in late Miocene or late Baodean in the Chinese Land Mammal Stage (Wang et al., 2009). T. Deng et al. (2019; Neogene chapter of China Integrated Stratigraphy and Timescale) show the age span as end-Tortonian through middle Messinian (but with wavy unconformity boundaries).

Age Span: 

    Beginning stage: 
Tortonian

    Fraction up in beginning stage: 
0.95

    Beginning date (Ma): 
7.47

    Ending stage: 
Messinian

    Fraction up in the ending stage: 
0.7

    Ending date (Ma):  
5.91

Depositional setting

It is interpreted as a river environment.


Depositional pattern:  

Additional Information


Compiler:  

Tao Deng, Sukuan Hou, J.Z. Qigao, Q. Li, Q.Q. Shi, B.Y. Sun, S.Q. Wang, F.X. Wu