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Oxytropidoceras posted a topic in Fossil NewsMegalodon may have been killed off by Supernova radiation, Hannah Osborne, Newsweek, December 13, 2018 https://www.newsweek.com/megalodon-extinct-shark-supernova-cosmic-ray-cancer-mutations-1256980 Massive supernova explosion may have wiped out giant prehistoric sharks, scientists say. Megalodon may have been among creatures driven to extinction after cosmic particles drove up cancer rates, new study claims The Independent, Josh Gabbatiss, December 2018 https://www.independent.co.uk/news/science/supernova-stars-explosion-giant-sharks-prehistoric-megalodon-extinction-science-a8679636.html The paper is: Adrian L. Melott, Franciole Marinho, and Laura Paulucci 2018, Hypothesis: Muon Radiation Dose and Marine Megafaunal Extinction at the End-Pliocene Supernova. Astrobiology, Published Online, November 27, 2018 https://doi.org/10.1089/ast.2018.1902 and at Muon Radiation Dose and Marine Megafaunal Extinction at the end-Pliocene Supernova Adrian L. Melott (Kansas), Franciole Marinho, Laura Paulucci (Submitted on 26 Dec 2017 (v1), last revised 17 Oct 2018 (this version, v2)) https://arxiv.org/pdf/1712.09367.pdf https://arxiv.org/abs/1712.09367 Yours, Paul H.