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Sea change in sediments

David J. Des Marais ()
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David J. Des Marais: Exobiology Branch and the NASA Astrobiology Institute, MS 239-4, NASA Ames Research Center

Nature, 2005, vol. 437, issue 7060, 826-827

Abstract: Earth's oxygen levels increased slowly over a long and ill-defined transitional period around two billion years ago. A microbial ‘footprint’ from this era provides biological evidence to complement existing geological data.

Date: 2005
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DOI: 10.1038/437826b

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