Granulometric curves of modern sediments of the Vilaine river basin, France, show a transition from parabolic to logarithmic shapes, following Riviere's terminology. The latter obtain only for the fine muds toward the mouth of the estuary. From calculations of the indices of evolution (n), sorting (g), and facies (Ng), the history of the sedimentary material can be followed closely, and apparent anomalies in the curves explained. At least the detrital part (84 percent) of the estuarine muds of the Vilaine is of fluviatile rather than marine origin.

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