U-Pb Zircon dating of ash fall deposits from the Paleozoic Paraná Basin of Brazil and Uruguay: a reevaluation of the stratigraphic correlations - Rocha-Campos, A. C.; Basei, Miguel Angelo Stipp; Nutman, Allen; Santos, Paulo Roberto dos; Passarelli, Claudia Regina; Canile, Fernanda Maciel; Rosa, O. C. R.; Fernandes, M. T.; Santa Ana, Hector de; Veroslavsky, Gerardo (The Journal of Geology, 2019)