Abstract
This paper compares means, standard deviations and standard errors for length, breadth, thickness and weight of samples of 500 quartzite and flint/chert pebbles from six beach crest sites on the shingle beach at Chesil Beach, Dorset, England. Because of the conditions prevailing, grading alongshore is especially well developed but the principles apply elsewhere. The data are used in examining various shape ratios and indexes including LÜTTIG 's (1956) sigma (σ) and pi (π), the W entworth (1922)-C ailleux (1945) flatness index, K rumbein's (1941) sphericity index, and the maximum projection index of S need and F olk (1958). It is shown that the only comparable dimension or index between the quartzite and flint/chert population is thickness. Since the specific gravity of both lithological types is the same it would appear that over the range of pebble sizes and shapes present on this beach, thickness is the critical dimension in determining the overall sorting of pebbles by wave action.
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