Grain Size of Marine Beach Gravels

Textural analyses were made of 54 samples of gravel beaches from the Pacific coast of southern California and northern Mexico. These samples, plus 1 each from Washington and Japan and 6 others previously reported in the geological literature, are very well sorted and have nearly symmetrical frequency curves. The beach gravels are so much better sorted than fluvial gravels that textural analyses may serve as supplementary evidence in determining the agent of deposition of ancient conglomerates.