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Deep-Water Agglutinated Foraminifera from the Massignano Section (Ancona, Italy), a Proposed Stratotype for the Eocene-Oligocene Boundary

  • Mariella Bellagamba
  • Rodolfo Coccioni
Chapter
Part of the NATO ASI Series book series (ASIC, volume 327)

Abstract

A detailed taxonomic and quantitative study was carried out on the well preserved deep-water agglutinated foraminifera from the Late Eocene-Early Oligocene section at Massignano, near Ancona (Italy). It is possible to recognize thirty-three species representing 18 genera, belonging to 15 families among which Spiroplectamminidae and Eggerellidae predominate.

Some faunal changes are found which are correlated to the calcareous nannofossil and both planktonic and benthonic foraminiferal biostratigraphy, to the magnetostratigraphy, and to the isotope stratigraphy, all established in the same sequence. A major faunal change can be observed in the uppermost part of Zone P16 (Late Eocene) where both generic and specific diversities decrease to a minimum. In particular, Vulvulina spinosa, Karreriella chapapotensis and Textularia adalta increase upwards in abundance whereas Karreriella subglabra and Textularia dibollensis show an opposite trend. Moreover, V. spinosa shortly drops in abundance whereas Dorothia trochoides and K. chapapotensis reach maximum numbers. The faunal variations recognized are possibly due to environmental changes.

Abundance and diversity of agglutinated foraminifera increases across the Eocene-Oligocene boundary. Moreover, some new species (Repmanina charoides, Haplophragmoides eggeri, H. ex gr. suborbicularis, Recurvoides cf. sp. 2, Arenobulimina subsphaerica and Trochammina acariniformis) are found, most of them have a coarser wall texture compared with other agglutinants throughout the sequence. Such faunal variations coincide with a decrease in both species diversity and test-sizes among the benthic foraminifera and with a marked decrease in calcium carbonate content. They may therefore be related to a productivity change and/or to a pulse of terrigenous supply.

Keywords

Type Species Benthic Foraminifera Late Eocene Planktonic Foraminifera Calcareous Nannofossil 
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 Science+Business Media Dordrecht 1990

Authors and Affiliations

  • Mariella Bellagamba
    • 1
  • Rodolfo Coccioni
    • 1
  1. 1.Istituto di Geologia dell’UniversitàUrbinoItaly

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