The estimation of error in grain size analysis and its comparison with the variation in size and size-sorting is reduced to an exact test of significance by means of analysis of variance technique. The errors from a number of different rock types and environments are compared and the test is shown to offer a basis for judging the relative uniformity of a sediment in terms of size and size-sorting. The magnitude of the experimental error is considerably inflated by differences between operators and also, on the basis of the present evidence, it appears that there is a relationship between the magnitude of error and the mean size of the sediment.

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