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. Wave-transported boulders represent important records ofstorm and tsunami impact over geological timescales. Their use for hazardassessment requires chronological information on their displacement that inmany cases cannot be achieved by established dating approaches. To fill thisgap, this study investigated, for the first time, the potential of opticallystimulated luminescence rock surface exposure dating (OSL-RSED) forestimating cliff-detachment ages of wave-transported coastal boulders. Theapproach was tested on calcarenite clasts at the Rabat coast, Morocco.Calibration of the OSL-RSED model was based on samples with rock surfacesexposed to sunlight for ∼  2 years, and OSL exposure ages wereevaluated against age control deduced from satellite images. Our resultsshow that the dating precision is limited for all targeted boulders due tothe local source rock lithology which has low amounts of quartz andfeldspar. The dating accuracy may be affected by erosion rates on bouldersurfaces of 0.02–0.18 mm yr −1 . Nevertheless, we propose a robust relativechronology for boulders that are not affected by significantpost-depositional erosion and that share surface angles of inclination withthe calibration samples. The relative chronology indicates that (i) mostboulders were detached from the cliff by storm waves; (ii) these stormslifted boulders with masses of up to ∼  24 t; and (iii) therole of storms in the formation of boulder deposits along the Rabat coastis more significant than previously assumed. Although OSL-RSED cannotprovide reliable absolute exposure ages for the coastal boulders in thisstudy, the approach has large potential for boulder deposits composed ofrocks with larger amounts of quartz or feldspar and less susceptibility toerosion.

earth surface dynamics

Evaluating optically stimulated luminescence rock surface exposure dating as a novel approach for reconstructing coastal boulder movement on decadal to centennial timescales