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

Silva-Casal R. ; Serra-Kiel J. ; Rodríguez-Pintó A. ; Pueyo Morer, E.L. (Universidad de Zaragoza) ; Aurell Cardona, M. (Universidad de Zaragoza) ; Payros A.

Resumen: 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, Idalina osquetaensis, is described. The systematic revision of middle to late Lutetian alveolines led to a reassessment of Alveolina fusiformis 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 Nummulites and 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).

Idioma: Inglés

DOI: 10.1344/GeologicaActa2021.19.7

Año: 2021

Publicado en: Geologica Acta 19, 7 (2021), [81 pp.]
ISSN: 1695-6133

Factor impacto JCR: 1.067 (2021)

Categ. JCR: GEOLOGY rank: 39 / 49 = 0.796 (2021) - Q4 - T3

Factor impacto CITESCORE: 2.9 - Earth and Planetary Sciences (Q2)

Factor impacto SCIMAGO: 0.565 - Geology (Q2)

Tipo y forma: Article (Published version)

Área (Departamento): Área Geodinámica Interna (Dpto. Ciencias de la Tierra)
Área (Departamento): Área Estratigrafía (Dpto. Ciencias de la Tierra)