Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks

@article{Ohtomo2014EvidenceFB,
  title={Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks},
  author={Yoko Ohtomo and T. Kakegawa and A. Ishida and T. Nagase and M. Rosing},
  journal={Nature Geoscience},
  year={2014},
  volume={7},
  pages={25-28}
}
The Archaean rocks of Isua, West Greenland, contain graphite, but its origins are debated. Geochemical and microscopic analyses suggest that the graphite was formed from biologically formed carbon that was deposited at least 3.7 billion years ago. 
Archean Fossil Microorganisms
Keivy Paraschists (Archean–Early Proterozoic): Nanobacteria and Life
Graphitic carbons and biosignatures 2 3
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