CONCLUSIONS

The record of Cenozoic South American rodent and/or rodent-like footprints has recently gained more attention, although it is still uncommon. The detailed study of new findings of South American rodent footprints enhances the knowledge of its temporal and geographical distribution. The tetradactyl footprints of the Vinchina Formation provide valuable information about the possible early occurrence of dinomyids in South America. It could represent the oldest record of dinomyids in Argentina, extending the geographic distribution of the group to northwestern Argentina during the Late Oligocene.