Ostracods of the Toarcian (Jurassic) of Peniche, Portugal: taxonomy and evolution across and beyond the GSSP interval

 

Authors: Cabral MC, Lord AR, Pinto S, Duarte LV, Azeredo AC

Published in: Bulletin of Geosciences, volume 95, issue 3; pages: 243 - 278; Received 20 December 2019; Accepted in revised form 27 May 2020; Online 4 July 2020

Keywords: Pliensbachian-Toarcian, ostracods, CIE, taxonomy, biostratigraphy, palaeobiogeography, Portugal,

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Abstract

The stratigraphical occurrence of ostracod assemblages of the uppermost Pliensbachian (emaciatum Biozone) and Lower-Middle Toarcian (polymorphum, levisoni and bifrons biozones) at Peniche, western Portugal, is reported, an interval that encompasses the Toarcian Global Boundary Stratotype Section and Point (GSSP) and the Toarcian Oceanic Anoxic Event as represented by a Carbon Isotope Excursion (CIE). The broad pattern of ostracod faunal turnover and replacement in the Peniche GSSP section before, during and after the CIE, including “survivor” and “Lazarus” species, and the stepwise extinction of metacopine ostracods is similar to that described from elsewhere in Western Europe. Assemblage composition is closest to material described from the Fastnet Basin, offshore SW Ireland, and the Mochras Farm Borehole, Wales, Great Britain. The δ13C record at Peniche and Mochras Farm facilitates a very refined comparison of ranges of species in common between the two sites. The species Bairdia paramolesta sp. nov. and Kinkelinella ventrocarinata sp. nov. are described.

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