Silvia N. Césarihttps://orcid.org/0000-0001-7311-1156,^1,*,** Carlos O. Limarinohttps://orcid.org/0000-0002-9891-143X,^2,*** Sergio Marenssi,^2,**** Patricia L. Ciccioli,^2,***** Fanny C. Bello,^3,****** Luis C. Ferreira,^4,******* Leonardo R. Scarlatta,^3,******** Richard Friedman<sup>5,*********

1</sup>CONICET – Museo Argentino de Ciencias Naturales B. Rivadavia, Buenos Aires, Argentina
²CONICET – Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Buenos Aires, Argentina
³Comisión Nacional de Energía Atómica (CNEA), Córdoba, Argentina
⁴Comisión Nacional de Energía Atómica (CNEA), Salta, Argentina
⁵Pacific Centre for Isotopic and Geochemical Research, University of British Columbia, Vancouver, British Columbia, Canada

^*CONTACT Silvia N. Césari silviancesari@gmail.com CONICET – Museo Argentino de Ciencias Naturales B. Rivadavia, Buenos Aires, Argentina
^**Silvia N. Césari is a Researcher Scientist with the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). In 2003 she moved from the University of Buenos Aires to the Museo Argentino de Ciencias Naturales B. Rivadavia. Silvia was President of the Asociación Paleontológica Argentina and Editor-in-Chief of Ameghiniana and Revista del Museo de Ciencias Naturales. Her research, since her doctoral thesis, has been focused on late Paleozoic palynofloras and megafloras. Recently new contributions on late Triassic assemblages were added to her studies. The main goal of the investigations, with her husband Limarino and collaborators, is to improve the late Paleozoic biostratigrapy of western Gondwana.
^***Carlos O. Limarino is a Researcher Scientist with the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Professor of Sedimentology at Buenos Aires University, and Member of the Academia Nacional de Ciencias. His research focuses in the reconstruction of the paleoenvironmental evolution of the western basins of Argentina during the late Paleozoic. He was President of the Asociación Sedimentológica Argentina, co-author of the book Petrología y diagénesis de rocas clásticas, and editor of several special publications.
^****Sergio Marenssi is a Researcher Scientist with the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Professor of Sedimentary Basins at Buenos Aires University. Sergio was director of the Argentinian Antarctic Institute for ten years. At present his is focused on sedimentological studies of late Paleozoic and Tertiary sequences from western Argentina.
^*****Patricia Ciccioli is a Researcher Scientist with the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Assistant Teacher at Buenos Aires University. At present Patricia is Academic Secretary of the Department of Geology and she received the Stimulus in Earth Sciences Award of the Academia Nacional de Ciencias Exactas, Físicas y Naturales in 2017. Her research is focused on Cenozoic stratigraphy and sedimentology of the foreland basins of Argentina and late Paleozoic ecosystems of Argentina.
^******Fanny Carina Bello is Chief of the Division of Uranium Geology in the CNEA (Comisión Nacional de Energía Atómica), Córdoba, Argentina. She is in charge of geological exploration in uranium-bearing stratigraphic units.
^*******Luis C. Ferreira works in the Exploration Section of the CNEA (Comisión Nacional de Energía Atómica) in the Northwest Regional Management. He conducts stratigraphic field studies on late Paleozoic uranium-bearing sequences, proposing metallogenetic models.
^********Leonardo R. Scarlatta received his Bachelor's Degree in 2007 from the Universidad Nacional de Córdoba, Argentina. He works for National Atomic Energy Commission (CNEA) as an exploration geologist. He is in charge of applying different exploration techniques in order to understand the geology in different environments and thus be able to find new uranium deposits.
^*********Richard M. Friedman was, at the time that this research was conducted, a research scientist and laboratory manager at the Pacific Centre for Isotopic and Geochemical Research at the Department of Earth, Ocean and Atmospheric Sciences at the University of British Columbia (UBC) in Vancouver, BC, Canada. He has worked in the field of U-Pb geochronology at UBC for more than 30 years and retired in April, 2021.