Keller, Gerta, Hassan Khozyem, Thierry Adatte, N. Malarkodi, Jorge Spangenberg, and Wolfgang Stinnesbeck. (2013) 2013. “Chicxulub Impact Spherules in the North Atlantic and Caribbean: Age Constraints and Cretaceous–Tertiary Boundary Hiatus”. Geological Magazine 150 (05): 885-907. doi:10.1017/S0016756812001069.
Gerta Keller, Professor of Geosciences, Emeritus Volcanism, Impacts and Mass Extinctions
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Volcanism, Impacts and Mass Extinctions