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Ordovician period

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Paleozoic era

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Ordovician-Silurian extinction events
Extinction events Ordovician period Silurian period
Culprit for Mass Extinction 445 Million Years Ago? Global Warming - The New York Times
https://www.nytimes.com/2020/06/10/science/global-warming-ordovician-extinction.html
Articles in the New York Times Carbon dioxide Glaciers, icebergs and sea ice Late Ordovician mass extinction (LOME)Mercury (chemical element)Molybdenum Ordovician period Oxygen Uranium Volcanic eruptions
Ordovician - Wikipedia
https://en.wikipedia.org/wiki/Ordovician
Ordovician period
The Anthropocene epoch: have we entered a new phase of planetary history? | Environment | The Guardian
https://www.theguardian.com/environment/2019/may/30/anthropocene-epoch-have-we-entered-a-new-phase-of-planetary-history
Anthropocene epoch Articles in the Guardian Bill Ruddiman Cretaceous Holocene InterContinental Shanghai Wonderland International Commission on Stratigraphy (ICS)International Union of Geological Sciences (IUGS)Jan Zalasiewicz Jedediah Purdy Leicester University Max Planck Institute for Chemistry Ordovician period Paul Crutzen Peter Sloterdijk Philip Gibbard Pliocene Precambrian eon Quaternary Stanley Finney