Detailed mechanical analyses of shallow marine quartz sands containing 20 to 40 percent shell fragments, collected along the coasts of the Cape of Good Hope, are presented. Weight percentage cumulatives expressed in terms of lognormal components showed that points of inflection separating the three principal modes persistently occur at about 0.8 and 2 phi. The shapes of the cumulatives and the positions of the inflections are not related to shell content. Analysis of the polymodality leads to the conclusion that the Stokes-Impact formulas account for the 2 phi point and that mixing of the suspension and traction loads is responsible for the 0.8 phi point.

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