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},
  pages={825 - 827}
}
  • S. Awramik
  • Published 19 November 1971
  • Environmental Science, Geography, Geology
  • Science
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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References

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TLDR
The stratigraphic distribution in Australian Precambrian rocks of columnar stromatolites, organosedimentary structures formed by blue-green algae, has been investigated and the discovery of successive different assemblages supports not only regional but also intercontinental stratigraphy correlations which are in agreement with available isotopic datings.
Stromatolites and oncolites in the Otavi series, South-West Africa
ABSTRACT The dolomite beds of the Otavi Series are unusually rich in stromatolites and oncolites. Individual reefs contain varied composite forms dictated by local paleo-environment. It is thought
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TLDR
The fossil Pteridinium, a distinctive component of a worldwide early metazoan (Ediacaran)assemblage, is provisionally recorded from probable early Cambrian strata in eastern California, implying a Cambrian age for the Ediacaran fauna and approximate coincidence of limits between Phanerozoic-Cryptozoic, Paleozoic-Precambrian, and Cambrian-PreCambrian.
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  • B. W. Logan
  • Environmental Science
    The Journal of Geology
  • 1961
Stromatolitic sediments and structures resembling Cryptozoon and Collenia are presently forming in the bay-head environment at Shark Bay, Western Australia. Algal-laminated sediments are due to
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