First record of Anisian deposits in the Betic External Zone of southern Spain and its paleogeographical implications
Identificadores
URI: https://hdl.handle.net/10481/81040Metadatos
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Pérez-Valera, Fernando; Pérez-López, Alberto; Götz, Annette E.; Ros-Franch, Sonia; Márquez-Aliaga, Ana; Baeza-Carratalá, José Francisco; Pérez-Valera, Juan AlbertoMateria
Muschelkalk Pelsonian Illyrian Index fossils Epicontinental platform Western Tethys
Fecha
2023-03-24Referencia bibliográfica
Pérez-Valera, F., Pérez-López, A., Götz, A.E., Ros-Franch, S., Márquez-Aliaga, A., Baeza-Carratalá, J.F., Pérez-Valera, J.A., 2023. First record of Anisian deposits in the Betic External Zone of southern Spain and its paleogeographical implications, Sedimentary Geology, 449, 106374.
Resumen
In the External Zone of the Betic Cordillera (S Spain), upper Muschelkalk (Ladinian) facies have been known for
decades; however, so far there is no stratigraphic record of Anisian deposits. In the present study, new biostratigraphic
data from a carbonate succession in the easternmost Subbetic domain reveal a Pelsonian-Illyrian
(Anisian) age. The nautiloids Germanonautilus salinarius and Germanonautilus saharonicus are documented for
the first time in the Iberian Peninsula, and together with the brachiopod Tetractinella trigonella and the bivalves
Neoschizodus orbicularis and Myophoria vulgaris they represent marker fossils of Anisian deposits previously described
from many other basins, both in the Germanic and Alpine realms. The co-occurrence of the nautiloid
G. saharonicus and the bivalve Gervillia joleaudi at the top of the studied succession serves as correlation tool
for the first faunal migration event from the Sephardic towards the Subbetic domain. The palynomorph assemblage,
including the monosaccate pollen grain Cristianisporites triangulatus, provides further evidence of a late
Anisian age. An integrated study of fossil assemblages and sedimentary facies reveals tidal and very shallowmarine
environments that characterize an extensive epicontinental platform in the western Tethys along the
paleo-margin of the Iberian Massif. Two thin shale intervals represent two distinct transgressive phases, correlative
to the Pelsonian maximum-flooding zone recorded in other European basins. The new findings contribute
to the ongoing paleogeographic reconstruction of epicontinental platform settings which developed during the
Middle Triassic in the Peri-Tethyan realm.