Study of thin sections shows that dolomite is virtually restricted to rodlike segments of coralline algae in a core of dolomitized Eocene limestone from Eniwetok atoll, whereas foraminiferal tests and corals are relatively unaltered. Dolomitization is believed to have taken place by growth of small dolomite nuclei representing local concentrations of Mg ions in the high-magnesian calcite of the algal precipitate.

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