Sloanbaatar is a mammal genus that lived in Mongolia during the Upper Cretaceous. It shared the world with dinosaurs. This animal was a member of the also extinct order of Multituberculata.
For those of a technical disposition, it's within the suborder of Cimolodonta, and a member of the Sloanbaataridae.
Genus: Sloanbaatar Kielan-Jaworowska Z, 1970
'Sloan's hero' (Named in honour of paleotologist RE Sloan.)
Species: Sloanbaatar mirabillis Kielan-Jaworowska Z, 1970
Place: Djadokhta Formation
Age: Coniacian - Santonian, Upper Cretaceous
Remarks: Info welcome.
Reference: Kielan-Jaworowska (1970), New Upper Cretaceous multituberculate genera from Bayn Dzak, Gobi Desert. Palaentologica Polonica, 21, p.35-49.
Page references: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.
(This information has been derived from  MESOZOIC MAMMALS; Djadochtatherioidea, an internet directory. As that's my webpage, there are no issues of copyright. Trevor Dykes)