A rapid technique for assessing shingle particle form in the field is described. Particle shape (flatness/sphericity) and roundness (roundness/angularity) are determined separately with reference to a visual matrix of 6 categories each. The results are plotted directly on a bivariate scattergram. The results compare favorably with Cailleux's indices for environmental differentiation of particles.

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First page of A visual measure of shingle particle form for use in the field
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