Schulte, P., W. Stinnesbeck, D. Stüben, U. Kramar, Z. Berner, G. Keller, and T. Adatte. 2003. “Fe-Rich and K-Rich Mafic Spherules from Slumped and Channelized Chicxulub Ejecta Deposits in the Northern La Sierrita Area, NE Mexico”. International Journal of Earth Sciences 92: 114-42. doi:10.1007/s00531-002-0304-9.
Gerta Keller, Professor of Geosciences, Emeritus Volcanism, Impacts and Mass Extinctions
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Volcanism, Impacts and Mass Extinctions