Carbon isotopes support the presence of extensive land floras pre-dating the origin of vascular plants.

@article{Tomescu2009CarbonIS,
  title={Carbon isotopes support the presence of extensive land floras pre-dating the origin of vascular plants.},
  author={A. Tomescu and L. Pratt and G. Rothwell and P. Strother and G. Nadon},
  journal={Palaeogeography, Palaeoclimatology, Palaeoecology},
  year={2009},
  volume={283},
  pages={46-59}
}
Abstract Multiple lines of evidence indicate that Earth's land masses became green some 2.7 Ga ago, about 1 billion years after the advent of life. About 2.2 billion years later, land plants abruptly appear in the fossil record and diversify marking the onset of ecologically complex terrestrial communities that persist to the present day. Given this long history of land colonization, surprisingly few studies report direct fossil evidence of emergent vegetation prior to the continuous record of… Expand
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