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Keller, G. and Khozyem, H. and Adatte, T. and Malarkodi, N. and Spangenberg, J.E. and Stinnesbeck, W. (2013) Chicxulub impact spherules in the North Atlantic and Caribbean: Age constraints and Cretaceous-Tertiary boundary hiatus. Geological Magazine, 150 (5). pp. 885-907. ISSN 00167568