High resolution ammonite–benthic foraminiferal biostratigraphy across the Aalenian–Bajocian boundary in the Lusitanian Basin (Portugal)

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http://eprints.org/relation/isVersionOf https://eprints.ucm.es/id/document/362897 http://eprints.org/relation/isVolatileVersionOf https://eprints.ucm.es/id/document/362897 http://eprints.org/relation/isIndexCodesVersionOf https://eprints.ucm.es/id/document/362897 archive 30181 lost+found/00/06/31/30 2020-11-24 08:52:59 2020-11-24 09:18:47 2020-11-24 08:52:59 article show Silva S. C. Henriques M. H. hhenriq@dct.uc.pt Canales Fernández María Luisa mcanales@ucm.es High resolution ammonite–benthic foraminiferal biostratigraphy across the Aalenian–Bajocian boundary in the Lusitanian Basin (Portugal) pub A_13_319 61 237 Ammonites; Benthic foraminifera; Biostratigraphy; Aalenian–Bajocian boundary; Lusitanian Basin; Portugal This work describes the ammonite and benthic foraminiferal assemblages recorded across the Aalenian–Bajocian boundary of the Serra da Boa Viagem II section, located about 6 km to the east of the Bajocian GSSP (Murtinheira, Portugal), and calibrated to the standard ammonite zonation previously established for the Lusitanian Basin. A total of 220 ammonite specimens referred to 30 fossiliferous levels were collected and identified throughout the section, enabling the recognition of the Concavum Zone (Concavum and Limitatum subzones) of the upper Aalenian, and the Discites Zone of the lower Bajocian. A total of 2356 foraminifers were obtained from the 16 samples collected along the section, corresponding to 4 suborders, 8 families, 16 genera and 44 species. The occurrence of Lenticulina quenstedti (Gümbel) has enabled the recognition of the Lenticulina quenstedti Zone, ranging from the Bradfordensis Zone (middle Aalenian) to the lower Discites Zone (lower Bajocian). The first record of Ramulina spandeli Paalzow, whose occurrence, up to now, was limited in the Lusitanian Basin to the Murtinheira section (the Bajocian GSSP), highlights the usefulness of the Ramulina spandeli Zone, with its lower boundary referred to the lower Discites Zone (lower Bajocian). Other bioevents displaying local, basinal or regional biostratigraphic interest have also been identified. The benthic foraminiferal record here presented, accurately calibrated with the ammonite record, aims at contributing to support the recognition of the Lenticulina quenstedti Zone and the Ramulina spandeli Zone as formal biostratigraphic units integrating the biostratigraphic scale based on benthic foraminifers for the Aalenian–Bajocian boundary in the Lusitanian Basin (Portugal). 2015-07 published Wiley Online Library https://doi.org/10.1002/gj.2556 https://onlinelibrary.wiley.com/doi/full/10.1002/gj.2556 INVESTIGACION hhenriq@dct.uc.pt restricted Geological Journal 50 4 477-496 TRUE 0072-1050 https://onlinelibrary.wiley.com/ pub Ministerio de Ciencia e Innovación (MICINN) Universidad Complutense de Madrid CGL2011- 23947; CGL2011-25894 UCM (910431) Consortium Petrobras–Galp–Partex of Portugal