Wednesday, August 8, 2012


Mixed carbonate-silicicastic systems are common in the geologic record and numerous conceptual models have been proposed to explain their character.  In this study, Mateu-Vicens et al. examine the role of seagrass on the surface sediment of an extant mixed carbonate-siliciclastic system in the northern Mediterranean.  The results reveal that much of the sediment is poorly sorted siliciclastic skeletal sand, with a paucity of carbonate mud, interpreted to reflect the heterozoan association and in situ mixing in this temperate system.  The data provide a contrast with well-documented examples in either photozoan or exclusively carbonate settings, and provide the basis for comparison with, and interpretation of, ancient analogs.

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