Gravel clasts with attached fucoid algae Fucus vesiculosus from an Arctic intertidal flat at Pangnirtung in northern Canada are floated when the algae is at least three times heavier than the clast. When the algae is not large enough to float the clast to which it is attached, the form drag and lift which it provides allow moderate tidal currents to move very much larger stones than would be possible otherwise. These mechanisms offer a means of transporting coarse sediments to deep water where they may augment or be confused with ice-rafted materials.--Modified journal abstract.

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