The rapid intertidal lithification of beach deposits in the coral seas has received the attention of numerous investigators. Study of beachrock from the Dry Tortugas, Florida, shows that the aragonite cement is precipitated from the sea water remaining in the beach sands at low tide. High temperatures, rate of beach drainage, and the permanence of the beach, control the localization of beachrock. The recognition of beachrock in the fossil record is briefly discussed.

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