One-centimeter interval Pb 210 dating and 4 cm interval size analysis was carried on on sediment core collected in a prodelta depositional environment near the head of Saguenay Fjord. Results show a direct relationship between modal diameter
of the sand fraction and annual maximum mean monthly river discharge-associated with the spring freshet. Clay pellet zones observed in a gravity core are related to catastrophic events such as the 1971 St Jean Vianney landslide or to anthropogenic activities