A tectonically driven Ediacaran oxygenation event.

Nat Commun · 2019 · PMC6584537 · PMID 31217418

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an overall trendno p-value reported

Nevertheless, their increasing frequency 16 , 20 is consistent with an overall trend of oxygenation due to rising atmospheric pO 2 .

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.