Estudios Geológicos julio-diciembre 2019, 75(2), e118 ISSN-L: 0367-0449 https://doi.org/10.3989/egeol.43593.573 Recibido el 8 de mayo de 2019; Aceptado el 1 de julio de 2019; Publicado online el 2 de diciembre de 2019 Citation / Cómo citar este artículo: Warren, L.V. et al. (2019). Calibrating the Ediacaran-Cambrian transition in the SW Gondwana. Estudios Geológicos 75(2): e118. https://doi.org/10.3989/egeol.43593.573 Copyright: © 2019 CSIC. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial (by-nc) Spain 4.0 License. Calibrating the Ediacaran-Cambrian transition in the SW Gondwana Calibrando la transición ediacárico-cámbrica en Gondwana suddoccidental L.V. Warren 1 , E. Tohver 2 , L. Inglez 1 , J. Okubo 1 , C. Riccomini 3 , S. Xiao 4 1 Department of Applied Geology, Institute of Geosciences and Exact Sciences, São Paulo State University (Unesp), Rio Claro-SP, Brazil. Email: lucas.warren@unesp.br; ORCID ID: http://orcid.org/0000-0002-2050-6514, http://orcid.org/0000- 0002-2815-8788, http://orcid.org/0000-0001-9160-9994 2 Institute of Astronomy and Geophysics, São Paulo University (USP), São Paulo, Brazil. ORCID ID: http://orcid. org/0000-0002-3333-0917 3 Institute of Energy and Enviroment, São Paulo University (USP), São Paulo, Brazil. ORCID ID: http://orcid. org/0000-0002-7249-5706 4 Department of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, USA. ORCID ID: http://orcid.org/0000-0003-4655-2663 ABSTRACT The paleontological, isotopic and geochronological data summarized below support the paleogeographic and temporal correlation between Itapucumi (Paraguay) and Corumbá (Brazil) groups, suggesting a coeval sedimen- tary evolution of these units in the margins of the Amazon Craton and the Rio Apa Block. Keywords: Itapucumi Group; SHRIMP ages; Detrital and volcanic zircon; Nama assemblage; Ediacaran- Cambrian transition; SW Gondwana. RESUMEN Los datos paleontológicos, isotópicos y geocronológicos que se resumen a continuación apoyan la correlación paleogeográfica y cronológica entre los Grupos de Itapucumi (Paraguay) y Corumbá (Brasil), sugiriendo una evo- lución sedimentaria contemporánea entre estas unidades en los márgenes del Cratón Amazónico y del Bloque del Río Apa. Palabras clave: Grupo de Itapucumi; Edades SHRIMP; Zircones detríticos y volcánicos; Asociación tipo Nama; Tránsito Ediacárico-Cámbrico; SO Gondwana Introduction Recent advances in the paleontology, geochemistry and geochronology of terminal Neoproterozoic suc- cessions worldwide have contributed substantially to the calibration of the Ediacaran-Cambrian timescale. The majority of new data is reported from Ediacaran successions in North America, Asia and Africa. South American successions, in contrast, still lack reliable radiometric ages, hampering intercontinental brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Estudios Geológicos (E-Journal)