The Cretaceous-Tertiary boundary cocktail: Chicxulub impact triggers margin collapse and extensive sediment gravity flows

Timothy J. Bralower, Charles K. Paull, R. Mark Leckie

Research output: Contribution to journalArticlepeer-review

131 Scopus citations

Abstract

A distinctive mixture of reworked microfossils, impact-derived materials, and lithic fragments occurs in sediments at the Cretaceous-Tertiary boundary in the basinal Gulf of Mexico and Caribbean. VVe have named this mixture the Cretaceous-Tertiary boundary "cocktail." Lithologic and paleontologic evidence suggests that the cocktail was deposited by giant sediment gravity flows, apparently triggered by the collapse of continental margins around the Gulf of Mexico as a result of the Chicxulub impact. As most microfossils in the gravity-flow units are reworked, biostratigraphy provides only maximum ages. Recognition of the cocktail is a reliable way to identity Cretaceous-Tertiary boundary deposits in the basinal Gulf of Mexico and Caribbean.

Original languageEnglish (US)
Pages (from-to)331-334
Number of pages4
JournalGeology
Volume26
Issue number4
DOIs
StatePublished - Apr 1998

All Science Journal Classification (ASJC) codes

  • Geology

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