File:RochaCampos etal 2019 zircons for dating .jpeg

Summary
From the authors:

SEM images of zircon crystals. a, 2-RA-1-MS, Estrada Nova Formation (Teresina Formation, sample TER-1). b, Serrinha Member (SER-1), Rio do Rasto Formation, volcanic zircon. c, Rio Bonito Formation, tonstein Candiota (TA-C1). d, Serrinha Member (SER-1), Rio do Rasto Formation, detrital zircon.

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)