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Oxytropidoceras posted a topic in Fossil NewsThere is a series of open access papers about what caused the Late Ordovician mass extinction. They are: Bond, D.P. and Grasby, S.E., 2020. Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology. https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47377.1/586486/Late-Ordovician-mass-extinction-caused-by Mitchell, C. E., and Melchin, M.J., 2020. COMMENT: Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47946C.1/587311/COMMENT-Late-Ordovician-mass-extinction-caused-by Bond, D.P. and Grasby, S.E., 2020. REPLY: Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation. Geology. https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G47984Y.1/587312/REPLY-Late-Ordovician-mass-extinction-caused-by Wang, G., Zhan, R. and Percival, I.G., 2019. The end-Ordovician mass extinction: A single-pulse event?. Earth-Science Reviews, 192, pp.15-33. https://www.sciencedirect.com/science/article/pii/S0012825218305099 https://www.researchgate.net/publication/331275476_The_end-Ordovician_mass_extinction_A_single-pulse_event https://www.researchgate.net/profile/Gx_Wang2 Yours, Paul H.
Oxytropidoceras posted a topic in Fossil NewsDid the First Animals Live in a World Without Oxygen? A new study suggests the answer may be yes. https://www.airspacemag.com/daily-planet/did-first-animals-live-world-without-oxygen-1-180967792/ Stolper, D.A. and Keller, C.B., 2018. A record of deep-ocean dissolved O2 from the oxidation state of iron in submarine basalts. Nature, 553, pages 323–327 Received: 10 July 2017, Accepted: 02 November 2017 Published online: 03 January 2018 https://www.nature.com/articles/nature25009 yours, Paul H.