Pardo, Alfonso, and Gerta Keller. (2008) 2008. “Biotic Effects of Environmental Catastrophes at the End of the Cretaceous and Early Tertiary: Guembelitria and Heterohelix Blooms”. Cretaceous Research 29 (5-6): 1058-73. doi:10.1016/j.cretres.2008.05.031.
Gerta Keller, Professor of Geosciences, Emeritus Volcanism, Impacts and Mass Extinctions
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Volcanism, Impacts and Mass Extinctions