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Nature 437, 826-827 (6 October 2005) | doi:10.1038/437826b; Published online 5 October 2005
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Palaeobiology: Sea change in sediments
David J. Des Marais1
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.
The microorganisms that were the sole forms of life on the early Earth survived billions of years of profound environmental change. Their modern counterparts exhibit a broad range of metabolic capabilities, exploiting diverse energy sources and so thriving in many different environments.
- David J. Des Marais is in the Exobiology Branch and the NASA Astrobiology Institute, MS 239-4, NASA Ames Research Center, Moffett Field, California 94035-1000, USA.
Email: david.j.desmarais@nasa.gov
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