Catastrophic extinction of planktonic foraminifera at the cretaceous-tertiary boundary evidenced by stable isotopes and foraminiferal abundance at Caravaca, Spain

Kunio Kaiho, Marcos A. Lamolda

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50 Citations (Scopus)

Abstract

We present data demonstrating constant δ13C values in 12 common planktonic foraminiferal species, which constitute >99% of the total specimens (>63 μm) in assemblages collected across the Cretaceous-Tertiary (K-T) boundary at Caravaca, Spain. These latter values are in contrast to a rapid reduction in δ13C in samples of the fine fraction of carbonate at the K-T boundary and a subsequent negative shift of δ13C of a benthic foraminiferal species. These results indicate that the post-K-T occurrences of Cretaceous planktonic species in lower Danian sediments at Caravaca are the result of reworking. Rapid decreases in the percentage abundance of well-preserved specimens and in the number of specimens per gram of carbonate for the same 12 species at the K-T boundary also suggest reworking and abrupt extinction at the K-T boundary. Our data imply that sudden changes occurred within the pelagic ecosystem during the K-T boundary event.

Original languageEnglish
Pages (from-to)355-358
Number of pages4
JournalGeology
Volume27
Issue number4
DOIs
Publication statusPublished - 1999 Jan 1

ASJC Scopus subject areas

  • Geology

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