Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance

@article{Awramik1971PrecambrianCS,
  title={Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance},
  author={S. Awramik},
  journal={Science},
  year={1971},
  volume={174},
  pages={825 - 827}
}
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. 

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