Increase of Oxygen in the Earth's Atmosphere and Hydrosphere between −2.5 and −2.4 Ga B.P.
M. Bau, R. L. Romer and N. J. Beukes
GeoForschungs Zentrum Potsdam, Telegrafenberg Haus B, D-14473 Potsdam, Germany
Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa