BilikeBed Fm

The type section is located at the Longgushan (dragon bones hill) (E114°29′, N42°08′), about 1.5 km northwest of the Bilike village, Dagaitan town, Huade County, central Nei Mongol. It was named by Qiu et al. (2013, in Wang et al., 2013). The construction of a railway track in 1990s transected and destroyed the type section.

The Bilike Bed is characterized by a series of lacustrine brownish-red siltstone and sandy mudstones. It contains abundant fossil mammas, fishes, amphibians, reptiles, freshwater mollusks, and charophytes. Its thickness is in range of 8~10.5 m.

Mammals: Quyania cf. Q. chowi, Yanshuella primaeva, Desmana sp., Sorex minutoides, S. ertemteensis, S. pseudoalpinus, S. sp., Petenyia katrinae, Lunanosorex cf. L. lii, Parasoriculus tongi, Sulimskia ziegleri, Paenelimnoecus obtusus, Erinaceus mongolicus, Myotis cf. annectans, M. cf. M. horsfieldii, M. sp., Vespertilio cf. V. sinensis, Murina sp., Alilepus annectens, Ochotona lagreli, O. minor, Tamias ertemtensis, Sinotamias gravis, Prospermophilus orientalis, Hylopetes yani, Myomimus sinensis, Castor anderssoni, Sinozapus volkeri, Sicista wangi, S. bilikeensis, Lophocricetus grabaui, Paralophocricetus pusillus, Paralactaga suni, Brachyscirtetes cf. B. wimani, Dipus pliocenicus, Sinocricetus progressus, Nannocricetus mongolicus, Kowalskia zhengi, K. cf. K. similis, Microtodon cf. M. atavus, Anatolomys cf. A. teilhardi, Pseudomeriones abbreviates, Mimomys (Aratomys) bilikeensis, Prosiphneus cf. P. eriksoni, Apodemus lii, A. sp.，Orientalomys sinensis, Chardinomys bilikeensis, Huaxiamys sp., Allorattus engesseri, Micromys kozaniensis. (Qiu and Storch, 2000; Qiu and Li, 2016)

It is interpreted as a lake environment.