Quantifying the evolutionary turnover across the K-T boundary catastrophic planktic foraminiferal extinction event at El Kef, Tunisia

Four metrics (extinction ratio, speciation ratio, taxonomic flux and volatility) were used to quantify the planktic foraminiferal extinction and evolutionary pattern across the Cretaceous-Tertiary (K-T) boundary at El Kef (Tunisia). They revealed a stasis episode in the terminal Maastrichtian, a K-T...

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Bibliographic Details
Published in:GFF 2002-09, Vol.124 (3), p.121-126
Main Authors: Arenillas, Ignacio, Arz, José Antonio, Molina, Eustoquio
Format: Article
Language:English
Subjects:
Danian
extinction
K-T boundary
Maastrichtian
planktic foraminifera
speciation
taxonomic flux
volatility
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Summary:Four metrics (extinction ratio, speciation ratio, taxonomic flux and volatility) were used to quantify the planktic foraminiferal extinction and evolutionary pattern across the Cretaceous-Tertiary (K-T) boundary at El Kef (Tunisia). They revealed a stasis episode in the terminal Maastrichtian, a K-T catastrophic mass extinction and a post-K- T evolutionary radiation. This pattern was also correlated with geo-chemical and isotopic data. The impact evidence and the decrease in CaCO 3 and δ 13 C coincide with a period of high evolutionary volatility and significant changes in the taxonomic flux which are both very compatible with the impact theory.
ISSN:1103-5897
2000-0863
DOI:10.1080/11035890201243121