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

• Silva-Casal, Roi ^[1] ; Serra-Kiel, Josep ^[5] ; Rodriguez-Pintó, Adriana ^[6] ; Pueyo, Emilio ^[2] ; Aurell, Marcos ^[3] ; Payros, Aitor ^[4]
  1. [1] Universitat de Barcelona

     Universitat de Barcelona

     Barcelona, España

     
  2. [2] Instituto Geológico y Minero de España

     Instituto Geológico y Minero de España

     Madrid, España

     
  3. [3] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
  4. [4] Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Universidad del País Vasco/Euskal Herriko Unibertsitatea

     Leioa, España

     
  5. [5] Museu de Ciències Naturals de Barcelona, Departament de Paleontologia, Passeig Picasso s/n, 08003 Barcelona, Spain (Deceased)
  6. [6] Freelance Geologist consultor

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• Localización: Geologica acta: an international earth science journal, ISSN 1695-6133, Nº. 19, 2021
• Idioma: inglés
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• Resumen

  • 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).