Quaternary gravel deposits covering the bottom of the Bardena Blanca depression (Central Ebro
Basin, Navarra) have been studied. Three Late Pleistocene units (Qt1, Qt2 and Qt3) of gravel accumulation
have been differentiated using geomorphologic mapping, sedimentological analysis and optically stimulated
luminescence techniques. Chronological data show ages of 92, 52 and 15-21 ka respectively, which are
closely related to cold climate signals at regional scale. Aggradation in braided channel systems was mainly
controlled by increases in runoff and sediment supply