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    Science. 1971 Nov 19;174(4011):825-7.

    Precambrian columnar stromatolite diversity: reflection of metazoan appearance.

    Abstract

    Columnar stromatolites (organosedimentary structures built by bluegreen algae) show a marked decrease in diversity in the Late Precambrian; this decrease in diversity occurs at approximately the same time as the appearance of metazoans, 600 to 700 million years ago.

    PMID:
    17759393
    [PubMed]

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