 The Ischigualasto Formation was dominated by fluvial and floodplain environments with strongly seasonal rainfalls.Interlayered volcanic ash layers above the base and below the top of the formation provide chronostratigraphic control and have yielded ages of 231.4 ± 0.3 Ma and 225.9 ± 0.9 Ma respectively.Animals that lived alongside included numerous non-dinosaurian tetrapods, as well as basal dinosauromorphs.