• Corpus ID: 126835300

When did the Earth's atmosphere become oxic? A Reply

  title={When did the Earth's atmosphere become oxic? A Reply},
  author={Heinrich Dick Holland},
In the fall 1997 issue of The Geochemical News, H. Ohmoto (1) outlined two very different views regarding the evolution of atmospheric oxygen: the Cloud-Walker-Kasting-Holland (C –W-K-H) model and the Dimroth-Kimberley-Ohmoto (D-KO) model. The first maintains that oxygen was absent or very low in the atmosphere prior to ca. 2.3 Ga, and that pO2 rose rapidly to values = 0.03 atm during the Great Oxidation Event (G.O.E.) between ca. 2.25 and ca. 2.05 Ga. The second model postulates an essentially… 

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The chemistry of the atmosphere and oceans

tion. The third major section of the book introduces the field of river quality. Brief reviews are provided for sediment and heat as pollutants and for the extensive topic of chemical water quality,

The Geochemical News #93

  • 1997

The Proterozoic Biosphere: The Proterozoic Biosphere

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  • 1960