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The Cretaceous-Tertiary boundary crisis at Zumaya (Northern Spain). Micropaleon-tological data

  • Lamolda Marcos A. 
Mesozoic/Cenozoic Events
Part of the Lecture Notes in Earth Sciences book series (LNEARTH, volume 30)

Abstract

The Cretaceous-Tertiary (K/T) boundary sections in the Basque Country, mainly along cliff outcrops, are showing a key role in understanding the true nature of the End Mesozoic Biotic Crisis. The richness of their fossil associations — macro- and micro-fossils — and the sedimentologic conditions allow us to know a detailed biostratigraphy and the trends of fossil associations with regard to the K/T boundary. The well known Zumaya section has been a classic locality for the K/T boundary problems for more than 20 years. Furthermore, there are several others which match and complement the Zumaya section. Some planktonic foraminifera species disappeared before the K/T boundary — e.g. Abathomphalus mayaroensis (Bolli) — or underwent a strong decrease — e.g. Rosita contusa (Cushman), Rugoglobigerina rotundata Brönnimann. The total number of species decreased 15–20%, and the percentage of planktonic foraminifera was reduced from 92–95% to 84%, of all foraminifera. In addition, there is an increase of opportunistic species, both planktonic foraminifera and nannoflora species. These data allow us to recognize unstable conditions in the calcareous pelagic ecosystem, previous to the K/T boundary which is marked by geochemical anomalies. Therefore, our data do not fit well with causal models where extraterrestrial events are the only adduced causes.

Keywords

Benthic Foraminifera Basque Country Planktonic Foraminifera Calcite Vein Geochemical Anomaly 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Lamolda Marcos A. 
    • 1
  1. 1.Area de PaleontologíaUniversidad del País VascoBilbaoSpain

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