Approximate sediment grain surface areas were computed for 109 natural sediment samples ranging from sands to clays. This was done by assuming all particles to be spherical and summing the areas for each size fraction in the grain size analysis, where the average diameter for the size fraction was used for all grains in the fraction. The data are presented both as area per unit mass of dry sediment and as area per unit volume of wet sediment. Comparison of the results with theoretical curves for uniform spheres indicates the useful range of these computations.

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