Between the 4th and the 26th of July, Marcelo Fernandes, Marc Oliva and José María Fernández conducted field work with researchers from the AntAlp (University of Barcelona) and the GFAM (Complutense University of Madrid) research groups, in the Aran valley (Central Pyrenees). Together they have collected rock samples for Cosmic Ray Exposure dating to unveil the chronology of the glacial advances/stabilizations during the deglaciation in the Upper Garonne valley. From the terminal basin (400 m) to highest glacial cirque (2400 m), more than 90 samples were collected on moraine boulders, erratics, polished surfaces and rock glacier boulders. Beside the glacial evolution, the chronology of the transition stage between the glacial and the periglacial domains is also pursuit in this research.