Palynologic Assemblages within the depositional Sequences from the Middle to late Triassic Series of the Spanish and French Pyrenees

• Autores: M. Frechengues, Bernard Peybernes, C. Fournier-Vinas, Cl. Lucas
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 25, Nº. 3 (SEP-DIC), 1993, págs. 91-105
• Idioma: inglés
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• Resumen

  • The identification of seven palynology assemblages (P 1 to P 7 ) within the middle to late Triassic series (Anisian-Rhaetian interval) from the french and Spanish Pyrenees supports the correlations between the six successive Depositional Sequences (DS 237 to DS 211 ) forming this interval and the 3 rd order eustatic cycles of Haq et al. (1987). In this paper are described and illustrated: 1) an Anisian assemblages P 1 lower Muschelkalk, with Verrucosisporites applanatus and Calamospora tener, pointing to the base of the Transgressive Systems Tract of the DS 237 ; 2) a first Ladinian assemblages (middle Muschelkalk) P 2 , with Triadispora (T. Plicata, T. Aurea) and Vitreisporites pallidus, which characterizes the High Stand Systems Tract of the DS 237 , 3) a second Ladinian assemblages P 3 (upper Muschelkalk), with T. Plicata, Alisporites grauvogelli and Pityosporites neomundanus, indicating the base of the Transgressive Systems Tract of the DS 232 ; 4) a Carnian assemblage P 4 (lower Keuper), with Brodispora striata, Ovalipollis pseudoalatus and O. Ovalis which marks the High Stand Systems Tract of the DS 228 ; 5) a Norian assemblage P 5 (upper Keuper), with Circulina meyeriana, C. Granulatus and Praecirculina granifer, known in the High Stand Systems Tract of the DS 224 ; 6) and 7) two Rhaetian assemblages, P 6 and P 7 , belonging to distinct stratigraphic levels (base of the Transgressive Systems Tract and High Stand Systems Tract of the DS 215 ) but containing similar palynomorphs such as Rhaetipollis germanicus, Classopollis torsus, Cerebropollenites pseudomassulae and Granuloperculatipollis rudis. Four of these seven assemblages, (P 2 , P 3 , P 4 and P 5 ), are new for the Pyrenees. Particularly the P 4 and P 5 assemblages suggest new dating a for the Keuper pelitic facies where foraminfera are absent.