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Palynomorph succession of the Upper Pliensbachian–Lower Toarcian of the Peniche section (Portugal)

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2013-06
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Instituto Geológico e Mineiro (Lisboa)
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The Peniche section in the Lusitanian Basin (western Portugal) provides an exceptional, continuous record of the Portuguese Lower Jurassic, and is the candidate for the Global Boundary Stratotype Section and Point for the base of the Toarcian. This paper reports a palynological study of the Margaritatus, Spinatum, Polymorphum and Levisoni zones. Forty eight levels yielded representative and well preserved palynomorph assemblages. Fifty seven palynomorph taxa were recorded: 19 spore taxa, 20 pollen taxa, 11 acanthomorph acritarchs, 4 prasinophytes and 3 dinocyst taxa. The Pliensbachian levels show a characteristic predominance of Classopollis and a wide diversity of aquatic palynomorphs. The Toarcian levels are characterised by the pollen grains of Spheripollenites and a progressive reduction in the diversity of aquatic palynomorphs.
O perfil de Peniche, localizado na Bacia Lusitânica (Oeste de Portugal), mostra um registo contínuo e exceptional no contexto do Jurássico Inferior português, que inclui o candidato a estratotipo do limite Pliensbaquiano–Toarciano. Neste âmbito foi desenvolvido um estudo palinológico envolvendo as zonas Margaritatus, Spinatum, Polymorphum e Levisoni, tendo sido analisados 48 níveis com associações representativas e bem preservadas de palinomorfos. Foram identificados 57 taxa de palinomorfos: 19 de esporos, 20 de pólenes, 11 de acritarcas Acanthomorpha, 4 de prasinófitas e 3 de dinocistos. Os níveis do Pliensbaquiano são caracterizados pela larga predominância de Classopollis e pela diversidade de palinomorfos aquáticos. Os grãos de pólen Spheripollenites e a diminuição progressiva da diversidade de palinomorfos aquáticos caracterizam os níveis do Toarciano.
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