Precambrian columnar stromatolite diversity: reflection of metazoan appearance.

@article{Awramik1971PrecambrianCS,
  title={Precambrian columnar stromatolite diversity: reflection of metazoan appearance.},
  author={Stanley M. Awramik},
  journal={Science},
  year={1971},
  volume={174 4011},
  pages={825-7}
}
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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