Relative proportions of individual heavy minerals in the front- and back-bar beaches of Galveston Island are almost identical and indicate little or no compositional difference between the 2 beaches. Size distributions of the bulk sands from the 2 beaches, however, show marked differences. Sands of the back beach contain an excess of fine material over the amount predicted from lognormal curves; sands of the front beach exhibit a deficiency of fine sizes, with the deficiency most pronounced in the intermediate (0.1 mm.) range. The distribution curves are apparently the result of selective reworking of original shoreline sands. The textural features are controlled by local depositional environments on the bar, but compositional properties are apparently independent of these local environments.

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