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

Authors

  • Roi Silva-Casal Institut de Recerca Geomodels, Departament de Dinàmica de la Terra i de l’Oceà, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain. https://orcid.org/0000-0001-7267-4475
  • Josep Serra-Kiel Museu de Ciències Naturals de Barcelona, Departament de Paleontologia, Passeig Picasso s/n, 08003 Barcelona, Spain (Deceased)
  • Adriana Rodriguez-Pintó Freelance Geologist consultor
  • Emilio L Pueyo Instituto Geológico y Minero de España, Unidad de ZaragozaManuel Lasala 44, 50009 Zaragoza, Spain. Associated Unit in Earth Sciences IGME/Universidad de Zaragoza, Spain.
  • Marcos Aurell Department of Earth Science, University of Zaragoza, Pedro Cerbuna 12, E50009 Zaragoza, Spain.
  • Aitor Payros Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU), PO Box 644, E48080 Bilbao, Spain.

Keywords:

Larger Foraminifera, SBZ, Biostratigraphy, Magnetostratigraphy, Lutetian, Eocene, South Pyrenean Basin

Abstract

An extense systematic description of the Eocene larger foraminiferal faunas recorded in the South Pyrenean Basin (Sierras Exteriores) is presented herein. The large dataset provided in this work includes both Nummulites and Alveolina species, along with a variety of other porcellaneous and hyaline taxa with lesser biostratigraphic relevance, are represented. The larger foraminifera described in this work correspond mainly to the Lutetian (SBZ13 to SBZ16 biozones) interval, but late Ypresian (SBZ11, Cuisian) and Bartonian (SBZ17) shallow benthic zones have also been identified. As one of the most relevant results of this systematic analysis, a new species, Idalina osquetaensis, is described. The systematic revision of middle to late Lutetian alveolines led to a reassessment of A. fusiformis and the finding of two new precursor forms, described as affinis of their corresponding species, A. aff. fragilis and A. aff. elongata. The new forms A. aff. elongata and A. aff. fragilis fill the gap in the middle to late Lutetian alveolinid biostratigraphy. Despite not being exclusive to SBZ16, these new forms provide realiable biostratigraphic information where Nummulites are not present. This realibility lies on the correlation of Nummulites and Alveolina biomarkers in the same sections and their calibration to the global time scale through magnetostratigraphy. In fact, magnetostratigraphic calibration of all described taxa is also provided, along with an update of the SBZ calibration to the current Geologic Time Scale (Gradstein et al., 2012).

Author Biographies

Roi Silva-Casal, Institut de Recerca Geomodels, Departament de Dinàmica de la Terra i de l’Oceà, Universitat de Barcelona, Martí i Franquès s/n, 08028 Barcelona, Spain.

Josep Serra-Kiel, Museu de Ciències Naturals de Barcelona, Departament de Paleontologia, Passeig Picasso s/n, 08003 Barcelona, Spain (Deceased)

Adriana Rodriguez-Pintó, Freelance Geologist consultor

Emilio L Pueyo, Instituto Geológico y Minero de España, Unidad de ZaragozaManuel Lasala 44, 50009 Zaragoza, Spain. Associated Unit in Earth Sciences IGME/Universidad de Zaragoza, Spain.

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

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

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Published

2021-07-26

Issue

Section

Biochronology of the South Pyrenean Cenozoic, in memoriam Josep Serra-Kiel