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Benthic foraminiferal assemblages across the Aalenian–Bajocian boundary in the Iberian and Basque-Cantabrian basins (North Spain)

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Abstract

The aim of this work is to describe the benthic foraminiferal assemblages recorded across the Aalenian–Bajocian boundary (Middle Jurassic) in two sections of the Iberian and Basque-Cantabrian basins (North Spain), well calibrated with the standard ammonite zonation, in order to establish a biostratigraphic scale based on the foraminiferal record, and to infer the palaeoecological conditions that affected their development.

A total of 29 samples were collected in the studied sections, and the composition of the foraminiferal assemblages recorded throughout the studied stratigraphic interval was analysed using the stratigraphic distribution of the identified species, the quantitative data obtained through the estimation of relative abundances and the calculation of several diversity indexes.

The studied assemblages are moderately abundant and diverse, and they are constituted by a total of 5435 specimens, corresponding to 5 suborders, 13 families, 25 genera and 51 species. Their composition displays close similarities to those already described for the Jurassic carbonate platforms of the Boreal Realm (Type-A), Boreal Atlantic subdivision. For the studied stratigraphic interval, it was recognised the Lenticulina quenstedti Foraminiferal Zone, in which the recorded assemblages developed in intermediate part of a marine platform environmental conditions, well oxygenated and with normal salinity. In the Aalenian–Bajocian transition, it was possible to identify a sharp decrease in the abundance and diversity of the foraminiferal assemblages that has also been recognised in other coeval basins of the Iberian Plate palaeomargin, thus representing a bioevent of the Northern Hemisphere.

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Acknowledgements

The authors are grateful to the Centro Nacional de Microscopía Electrónica, University Complutense of Madrid, for the SEM photographs. The authors also acknowledge suggestions and comments provided by Dr. Boris Nikitenko and by an anonymous reviewer.

Funding

This study was supported by FEDER funds through the Competitiveness Factors Operational Programme - COMPETE and Portuguese funds by FCT in the frame of the UID/Multi00073/2013 Project and is a contribution for the Projects CGL2011-25894 (DGI, Spain), CGL2015-66604-R and CGL2014-52546-P (MINECO) and for the Grupo de Investigación UCM 910431 (Complutense University, Madrid, Spain).

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  1. Department of Earth Sciences and Geosciences Center, Faculty of Sciences and Technology, University of Coimbra (Polo II), Rua Sílvio Lima, 3030-790, Coimbra, Portugal

    Silvia Clara Silva & Maria Helena Henriques

  2. Department of Geodynamic, Stratigraphy and Paleontology, Faculty of Geological Sciences, University Complutense of Madrid, c/José Antonio Novais, 12, 28040, Madrid, Spain

    Maria Luisa Canales & Soledad Ureta

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Silva, S.C., Canales, M.L., Henriques, M.H. et al. Benthic foraminiferal assemblages across the Aalenian–Bajocian boundary in the Iberian and Basque-Cantabrian basins (North Spain). Palaeobio Palaeoenv 100, 51–78 (2020). https://doi.org/10.1007/s12549-019-00376-5

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