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Aquafacts

Aquafacts are wave-faceted rocks found on beaches. Although their occurrences are not rare, little attention has been given them. The characteristics of the features are similar to those of ventifacts , which owe their origin to wind action and abrasion (Keunen, 1947).

The requirements for the formation of aquafacts include: a sand supply sufficient to cause abrasion (pebbles tend to destroy the faceted surface); a boulder that is firmly wedged in place, a small projection of a rocky subsurface, or, most commonly, a rock large enough not to be moved by wave action.

Abrasion occurs on the seaward side of the rock. Sand-sized particles, brought up the beach by swash action, strike the rock, gradually producing the smooth, faceted surface. Backwash is not strong enough to cause abrasion on