Marcelo Fernandes and José María Fernández have finished a short research visit from September to October at the Laboratoire National des Nucléides Cosmogéniques (LN2C) – Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environnement (CEREGE), in Aix-en-Provence (France). The aim of this visit was to perform the physical and chemical processing of 47 rock samples from Val d’Aran (Central Pyrenees) and the Fildes peninsula (King George Island, South Shetland Islands, Antarctica) conducting for the extraction of 10Be and 36Cl cosmogenic nuclides, used for the application of cosmic-ray exposure dating. This technique will allow to date the deglaciation from the last glacial-interglacial transition in both study areas, giving answer to the research objectives of Marcelo Fernandes’s PhD thesis and the NUNANTAR Project.