Late Permian of Tanzania at the time of deposition of the Usili Formation.

Life restoration of Aenigmastropheus parringtoni (foreground), and herd of the dicynodont Endothiodon being pursued by a gorgonopsian. All these vertebrates were found together at the type locality of Aenigmastropheus parringtoni (locality B35). Drawing by Emilio López-Rolandi. 

See also: Emilio López-Rolandi on Deviantart and Emilio López-Rolandi Dinosaur Art

Source: The Origin and Early Evolution of Sauria: Reassessing the Permian Saurian Fossil Record and the Timing of the Crocodile-Lizard Divergence by Martín D. Ezcurra mail,Torsten M. Scheyer, Richard J. Butler PLoS ONE 9(2): e89165. doi:10.1371/journal.pone.0089165