The carbonate mineralogy of sediments in ten cores from Exuma Sound is interpreted to reflect Pleistocene sea-level changes. An assemblage of abundant low-magnesium calcite and relatively little aragonite in the lower parts is interpreted to represent mineralogically stable, recycled sediment derived from exposed portions of the Bahama Banks exposed during the latest Pleistocene sea-level lowering. An increased aragonite content in the upper parts of the cores suggests a return to unaltered aragonitic sedimentation following restoration of sea level. The mineralogic change found in the cores is abrupt and seems not to be related to textural changes.

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