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Did a gamma-ray burst initiate the late Ordovician mass extinction?

Did a gamma-ray burst initiate the late Ordovician mass extinction?. Adrian L. Melott 1 , B.S. Lieberman 2 , C.M. Laird 1 , L.D. Martin 3 , M.V. Medvedev 1 , B.C. Thomas 1 , J.K. Cannizzo 4 , N. Gehrels 4 , C.H. Jackman 5, R.S. Stolarski 5 , & D.P. Hogan 1

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Did a gamma-ray burst initiate the late Ordovician mass extinction?