''Sibirotherium'' is an extinct genus of
docodont mammaliaform. It is known from only a single named species, ''Sibirotherium rossicum'', known from jaw fragments and teeth found in the Early Cretaceous (
Aptian
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), a ...
) aged
Ilek Formation
The Ilek Formation is a Lower Cretaceous geologic formation in Western Siberia. Many different fossils have been recovered from the formation. It overlies the Late Jurassic Tyazhin Formation and underlies the Albian Kiya Formation.
The formation ...
in western Siberia, alongside ''
Khorotherium'' also from Siberia, it is one of the youngest docodonts.
References
{{Reflist
Docodonts
Prehistoric cynodont genera