Proximal cretaceous-tertiary boundary impact deposits in the Caribbean

Alan R. Hildebrand, William V. Boynton

Research output: Contribution to journalArticle

128 Scopus citations

Abstract

Trace element, isotopic, and mineralogic studies indicate that the proposed impact at the Cretaceous-Tertiary (K-T) boundary occurred in an ocean basin, although a minor component of continental material is required. The size and abundance of shocked minerals and the restricted geographic occurrence of the ejecta layer and impact-wave deposits suggest an impact between the Americas. Coarse boundary sediments at sites 151 and 153 in the Colombian Basin and 5- to 450-meter-thick boundary sediments in Cuba may be deposits of a giant wave produced by a nearby oceanic impact. On the southern peninsula of Haiti, a ∼50-centimeter-thick ejecta layer occurs at the K-T boundary. This ejecta layer is ∼25 times as thick as that at any known K-T site and suggests an impact site within ∼1000 kilometers. Seismic reflection profiles suggest that a buried ∼300-km-diameter candidate structure occurs in the Colombian Basin.

Original languageEnglish (US)
Pages (from-to)843-847
Number of pages5
JournalScience
Volume248
Issue number4957
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • General

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