Late inception of a resiliently oxygenated upper ocean

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Late inception of a resiliently oxygenated upper ocean‘Science Magazine

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To understand the evolution of the biosphere, we need to know how much oxygen was present in Earth’s atmosphere during most of the past 2.5 billion years. However, there are few proxies sensitive enough to quantify O2 at the low levels present until slightly less than 1 billion years ago. Lu et al. measured iodine/calcium ratios in marine carbonates, which are a proxy for dissolved oxygen concentrations in the upper ocean. They found that a major, but temporary, rise in atmospheric O2 occurred at around 400 million years ago and that O2 levels underwent a step change to near-modern values around 200 million years ago.

  • Publisher: Science
  • Date: 2018-07-13
  • Citation: Web link

Not to change the topic here:

Of Oshiomhole and the fallacy of PDP’s oppositional politics

Finally, the eagle has landed with the emergence of former governor of Edo state, Comrade Adams Aliyu Oshiomhole, as the national chairman of the All Progressives Congress (APC). By that strategic political orchestration and stratagem, the APC, under the leadership of President Muhammadu Buhari, has sounded the ultimate nunc dimittis for the opposition Peoples Democratic Party (PDP). The opposition must be wishing that this had not happened.’ Oshiomhole’s chairmanship of the governing APC is masterstroke in the contemplation of a revitalized winning machine ahead of the crucial 2019 presidential election in which Buhari, as the expected candidate, continues to be PDP’s nemesis and waterloo.

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  • Publisher: Vanguard News
  • Date: 2018-07-01T09:00:51+01:00
  • Twitter: @vanguardngrnews
  • Citation: Web link

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