Buginbaatar fossil map
Where fossils of Buginbaatar have been found, shown on the Earth as it looked about 66 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 66 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Early mammals |
|---|---|
| Lived | 72.2–66 million years ago (Maastrichtian) |
| Periods | Cretaceous |
| Family | Cimolomyidae |
| Named by | Kielan-Jaworowska and Sochava 1969 |
| Fossil records | 2 occurrences at 1 locations (PBDB) |
| Found in | Mongolia |
| Rock formations | Nemegt |
About Buginbaatar
Buginbaatar is an extinct genus of mammal from the Upper Cretaceous of Mongolia. It is a member of the extinct order Multituberculata, within the suborder Cimolodonta and family Cimolomyidae. It lived towards the end of the Mesozoic era.
The genus Buginbaatar was named by Kielan-Jaworowska Z. and Sochava A.V. in 1969 based on the remains of a single species. Remains of this species, dubbed Buginbaatar transaltaiensis, were found in Upper Cretaceous strata of the Nemegt Formation of Bügiyn Tsav in Mongolia.
Based on the dimensions of its teeth, Buginbaatar was slightly larger than Valenopsalis, which was estimated to weigh around 0.8–1 kilogram (1.8–2.2 lb), comparable to the extant Cynomys. It is the only Cretaceous Mongolian multituberculate not to belong to the family Djadochtatherioidea. Remains are incomplete and the assignment of Buginbaatar to the Cimolomyidae is tentative, (Kielan-Jaworowska & Hurum 2001, p. 408).
Text in “About” is quoted from the Wikipedia article Buginbaatar (revision 1349166468), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q18578827.
