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,\BSTR/\CT. The lst Meeting of the Committee for Upper Palaeozoic Chronostratigraphy of South America was held within the framework of the XI Rcuniiio tic Palcobouinicos c Polinologos (Gramado, Brazil, 2004), included researchers from Argentina, Brazil and Uruguay and was coordinated by Carlos Azcuy, This meeting established the first step to discuss and establish a regional chronostratigraphic scheme lor the Upper Paleozoic ofSouth America. The present formal scheme established in Western Europe, Russia and the North Ame rica, has been defined using fossil as emblagcs that arc not common in the region of Gondwana. All the participants considered the proposal and suggested thai the best way to establish a regional chronostratigraphy would be to prepare a synthesis of all systematic and other palaeontological and radiometric works of Upper Palaeozoic basins in the region. At the meeting it was agreed to divide the task as follows, with Dr. Carlos Azcuy as overall Coordinator. The first results of the project were discussed in the framework of the XIII Simposio Argentino de Paleobotanica y Palinologia (Bahia Blanca, Argentina, 2006) and a short communication in the-lth El\IPSLA,(4th European Meeting on Paleontology and Stratigraphy of Latin American) was presented as well. The biostratigraphic units established lor different basins of South America along with other data (more isolated and new informa tion) arc updated and discussed and a correlation chart supported by a list of selected references, RE. Ul\1E•. La I'Reunion del Comite de Cronocstratigrnfia del Paleozoico Superior de America del Sur, tuvo lugar en el marco de …