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Eight caves and one filled cave passage containing mammal bone remains and terrestrial molluscs were discovered in the Severo-Muisky, Delyun-Uransky and Aglan-Yan Ranges in the Kelyana, Pravyi and Sredny Mamakan river basins of the Stanovoj Upland. Nineteen species of mammals were identified among collected bones: Ochotona hyperborea, Lepus timidus, Myodes rufocanus, Myodes rutilus, Microtus cf. gregalis, Microtus cf. oeconomus, Microtus arvalis, Myopus schisticolor, Tamias sibiricus, Pteromys volans, Martes zibellina, Plecotus auritus, Murina hilgendorfi, Amblyotus nilssoni, Myotis brandti, Myotis petax, Myotis bombinus, Rangifer tarandus and Cervus elaphus. Four taxons were determined to a genus (Lepus, Myodes, Microtus and Alticola), one to a family (Mustelidae), three to an order (Insectivora, Artiodactyla, Carnivora) and one to a class (Aves); five species of terrestrial molluscs were also found: Vallonia tenuilabris, Bradybaena schrencki, Nesovitrea hammonis, Discus ruderatus, Euconulus fulvus. The layers containing mammal remains are of Holocene Age based on preservation state of bones. The site with molluscs’ shells within the filled cave passage on the watershed near the Prokhodnoi brook could be formed in Holocene, as well as in Pleistocene. All identified species are typical representatives of fauna of the mountain taiga landscapes in the south of Eastern Siberia. The described locations of fauna remains are the only known, within the studied area.