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Jens Helleland Adnanes. Early Earth may have been ice cold Early. 14.03.2016.
Maarten J. de Wit, Harald Furnes. 3.5-Ga hydrothermal fields and diamictites in the Barberton Greenstone Belt—Paleoarchean crust in cold environments. Science Advances 26 Feb 2016: Vol. 2, no. 2, e1500368 DOI: 10.1126/sciadv.1500368