Fig. 1. Geological and geographic context. A in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus

Fig. 1. Geological and geographic context. A. Location of the Paraná Basin in Brazil. B. Limits of the Triassic rocks of Rosário do Sul Group and the Triassic rocks of Paraná Basin in Rio Grande do Sul state. C. Location of the Buriol Site, locality of UFRGS-PV-1581-T, and nearby Predebon and Janner sites. D. Chrono-, lito-, and biostratigraphy of southern Brazilian Triassic (modified from Schultz et al. 2020). Arrow indicates stratigraphical position of UFRGS-PV-1581-T; * refers to absolute ages from Langer et al. (2018); ** refers to absolute ages from Philipp et al. (2018).