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The ups and downs of early atmospheric oxygen

February 19, 2014

one-billion-year-old weathering profiles The period of extended low oxygen, which spanned from roughly 2 to less than 1 billion years ago, was a time of remarkable chemical stability in the Earth's oceans and atmosphere. A University of California, Riverside, team of biogeochemists reports that oxygen was much lower than previously thought during this important middle chapter in Earth history, which likely explains the low abundance and diversity of eukaryotic organisms and the absence of animals. Full Story

University of California, Riverside

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