Evidence for early life in Earth’s oldest hydrothermal vent precipitates

By Matthew S. Dodd, D. Papineau, T. Grenne, J. Slack, M. Rittner, F. Pirajno, J. O’Neil, C. Little. Nature, 2017

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Origin and evolution of the atmospheres of early Venus, Earth and Mars (2018, background): “This timeline agrees with the recent discovery of fossilized microorganisms suggesting that life existed already 3.8 Gyr and up to 4.2 Gyr ago in Earth’s oldest submarine-hydrothermal vents at the Nuvvuagittuq belt in Quebec, Canada (Dodd et al. 2017) and in the Isua supracrustal belt metacarbonate ”
Frequent Flaring in the TRAPPIST-1 System—Unsuited for Life? (2017, background): “These questions on habitability are important, since the estimated age of TRAPPIST-1, which is at least 500 Myr (Filippazzo et al. 2015) (Luger et al. 2017 estimated 3–8 Gyr) could make possible the formation of life in ideal conditions, as the earliest life on Earth dates back to approximately 4 Gy”