Beach rock in several localities has aragonite as the primary cement with secondary filling of voids by calcite. The aragonite-cemented beach rock is intertidal in location and its cement is of marine origin, which distinguishes it from calcite-cemented eolianite and the beach rock defined by R. J. Russell as cemented beach sand formed by deposition of calcite cement from ground water at the water-table level, with secondary cementation on exposure. It is suggested that beach rocks which appear superficially similar may have diverse origins.

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