Keller, G. 2011. “Defining the Cretaceous-Tertiary Boundary: A Practical Guide and Return to First Principles”. In The End-Cretaceous Mass Extinction and the Chicxulub Impact in Texas, SEPM, Special Publication. Vol. No. 100. Tulsa: SEPM (Society for Sedimentary Geology).
Gerta Keller, Professor of Geosciences, Emeritus Volcanism, Impacts and Mass Extinctions
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Volcanism, Impacts and Mass Extinctions