Longshore variations in grain size, sorting, and skewness in foreshore beach sands of the Nautla area, Veracruz, Mexico suggest sorting and dispersion by seasonally reversing longshore current. Net sediment transport is from south to north, especially in the summer when winds are from the east-southeast. During the winter, northeasterly winds strike the coast causing a southward flowing longshore current and sediment transport. Sediments can be transported as far as 60 km south of the source due to these reversals as indicated by a study of fluvially derived carbonate lithoclasts. Skewness can be used to indicate the amount of fluvial influence. Positive skewness is found near river mouths where fluvial influence is greatest, and it becomes less positive or negative as winnowing by waves and longshore currents occur.

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