Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation: REPLY

  title={Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation: REPLY},
  author={David P. G. Bond and Stephen E. Grasby},
  • D. BondS. Grasby
  • Published 30 April 2020
  • Environmental Science, Geography
  • Geology
The Ordovician saw major diversification in marine life abruptly terminated by the Late Ordovician mass extinction (LOME). Around 85% of species were eliminated in two pulses 1 m.y. apart. The first pulse, in the basal Hirnantian, has been linked to cooling and Gondwanan glaciation. The second pulse, later in the Hirnantian, is attributed to warming and anoxia. Previously reported mercury (Hg) spikes in Nevada (USA), South China, and Poland implicate an unknown large igneous province (LIP) in… 

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