Herrerasaurus
The paleoenvironment of the Ischigualasto Formation (where it was found) was a volcanically active floodplain covered by forests with seasonal rainfall. The climate was moist and warm, with seasonal variations. The vegetation was ferns, horsetails, and giant conifers. These plants formed lowland forests along the banks of rivers. Herrerasaurus was the most common of the carnivores of the Ischigualasto Formation.