Sedophascolomys
Sedophascolomys is an extinct genus of wombat known from the Pliocene and Pleistocene of Australia. There is a single recognised species, S. medius, which was formerly placed in the invalid genus Phascolomys. It was found in the northeastern and eastern regions of the continent. It is estimated to be somewhat larger than extant wombats, with a body mass of 70-75 kilograms. The youngest remains of the genus date to the Late Pleistocene, around 50-40,000 years ago. It is thought to be closely related to the giant wombat genera Phascolonus and Ramsayia.

References 

Prehistoric vombatiforms
Prehistoric mammals of Australia
Prehistoric marsupial genera
Pleistocene life
Fossil taxa described in 1872