Stinnesbeck, Wolfgang, Gerta Keller, Peter Schulte, Doris üben, ZSOLT BERNER, Utz Kramar, and Guadalupe Lopez-Oliva. (2002) 2002. “The Cretaceous–Tertiary (K T) Boundary Transition at Coxquihui, State of Veracruz, Mexico: Evidence for an Early Danian Impact Event?”. Journal of South American Earth Sciences 15 (5): 497-509. doi:10.1016/S0895-9811(02)00079-2.
Gerta Keller, Professor of Geosciences, Emeritus Volcanism, Impacts and Mass Extinctions
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Volcanism, Impacts and Mass Extinctions