Subsea cementation of carbonate sediments was observed at depths of about 50 feet on a submerged barrier reef off the west coast of Barbados, W.I. The calcite cement is attributed to the burrowing of the pelecypod Gastrochaena hians through carbonate sands trapped in a sponge mat. Because of the difficulty in recognizing the cemented sediment on the sea floor, its areal distribution could not be estimated.

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