Fossils of Olivierosuchus have been found from the Early Triassic Lystrosaurus Assemblage Zone in South Africa.

As a distinguishing feature, Olivierosuchus also has a sharp ridge near the choana, an opening in the skull palate.

[2] Olivierosuchus was a top predator of the lower Lystrosaurus Assemblage Zone (LAZ) and lived alongside other large therapsids like Moschorhinus.

The burrow is straight and wide and includes an entry ramp and living chamber.

Remains of a juvenile Lystrosaurus dicynodont were found in the cast, but the individual was likely too small to dig the burrow.