Systematics of Lutetian larger foraminifera and magneto-biostratigraphy from the South Pyrenean Basin (Sierras Exteriores, Spain)

Authors

  • Roi Silva-Casal Institut de Recerca Geomodels, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain.
  • Josep Serra-Kiel Museu de Ciències Naturals de Barcelona, Passeig Picasso s/n, 08003 Barcelona, Spain.
  • Adriana Rodríguez-Pintó Freelance Geologist consultor
  • Emilio L. Pueyo Associated Unit in Earth Sciences IGME/Universidad de Zaragoza, Spain.
  • Marc Aurell University of ZaragozaPedro Cerbuna 12, E50009 Zaragoza, Spain.
  • Aitor Payros Faculty of Science and Technology, University of the Basque Country (UPV/EHU), PO Box 644, E48080 Bilbao, Spain.

Keywords:

SBZ recalibration, middle Eocene, southern Pyrenees, Paleogene biostratigraphy

Abstract

A systematic description of the Eocene larger foraminifera recorded in the South Pyrenean Basin (Sierras Exteriores) is presented herein. The large dataset provided in this work includes Nummulites and Alveolina species, along with a variety of other porcellaneous and hyaline taxa with lesser biostratigraphic relevance. Most of the larger foraminifera described in this work correspond to the Lutetian (SBZ13 to SBZ16 biozones) interval, but late Ypresian (SBZ11, Cuisian) and early Bartonian (SBZ17) shallow benthic zones have also been identified. A new species, Idalinaosquetaensis, is described. The systematic revision of middle to late Lutetian alveolines led to a reassessment of Alveolinafusiformis and the finding of two new precursor forms, described as Alveolina aff. fragilis and Alveolina aff. elongata. The new taxa fill in the gap existing so far in the middle to late Lutetian alveolinid biostratigraphy. Despite not being exclusive to SBZ16, these forms provide realiable biostratigraphic information in facies where Nummulites are not present. This realibility lies on the correlation of Nummulitesand Alveolina biostratigraphic markers in the same sections and their calibration to the global time scale through magnetostratigraphy. Magnetostratigraphic calibration of described taxa is provided, along with an update of the SBZ calibration to the Geological Time Scale (Gradstein et al., 2012).

 

Author Biographies

Roi Silva-Casal, Institut de Recerca Geomodels, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain.

Departament de Dinàmica de la Terra i de l’Oceà.

Josep Serra-Kiel, Museu de Ciències Naturals de Barcelona, Passeig Picasso s/n, 08003 Barcelona, Spain.

Departament de Paleontologia

Emilio L. Pueyo, Associated Unit in Earth Sciences IGME/Universidad de Zaragoza, Spain.

Department of Earth Science, University of Zaragoza, Pedro Cerbuna 12, E50009 Zaragoza, Spain.

Marc Aurell, University of ZaragozaPedro Cerbuna 12, E50009 Zaragoza, Spain.

Department of Earth Science.

Aitor Payros, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), PO Box 644, E48080 Bilbao, Spain.

Department of Stratigraphy and Paleontology

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Published

2021-11-12

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