Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance

Name: Work Video:
Duration: 3 min 30 s
Description: 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.
Stanley M. Awramik
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