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    Science. 1971 Nov 19;174(4011):825-827.

    Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance.

    Awramik SM.

    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 - as supplied by publisher]

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