File:RochaCampos etal 2019 strata for dating .jpeg

Summary
From the authors: Photographs of selected outcrops. a, Tonsteins from the Rio Bonito Formation (sample TA-C1); arrow indicates “Banco Luoco.“ b, Bentonite from the Irati Formation, lower shale (SM-1), Petrobras Petrosix Mine, São Mateus do Sul (arrow). c, Bentonites from the Mangrullo Formation, Cañada del Rodeo del Barón, Uruguay, where layers 4 (EB-1) and 5 (EB-2) were sampled (arrows). Note the shale of the Paso Aguiar Formation (Permian) cropping out on the upper-left side.

Published by: Rocha-Campos, A. C. et al. 2019 U-Pb Zircon Dating of Ash Fall Deposits from the Paleozoic Paraná Basin of Brazil and Uruguay: A Reevaluation of the Stratigraphic Correlations. J GEOL 127, 167–182. (doi:10.1086/701254)