Abstract
The biostratigraphy of Calasparra Section is well-estabished with an ammonoid biozonation and ranges from Lower to Upper Ladinian. The continuous presence of Pseudofurnishius murcianus van den Boogaard, a characteristic conodont species of the Sephardic realm, along the section makes it one of the most important sections in the Iberian Peninsula for the study of the species. The first apparition of P. murcianus in the section corresponds with the first of Eoprotrachyceras curionii taxon, which is the principal marker for the base of the Ladinian stage in the GSSP of the Anisian-Ladinian boundary, and the age of the youngest conodonts, based on ammonoids (Epigonus Zone) is Lower Ladinian (upper Fassanian). This is similar to the range of P. murcianus in the Saharonim Formation in Israel, where its earliest appearance is also Early Fassanian (Curionii zone) age.
Highlights
The Betic Cordillera is a mountain system in southern Spain that extends in SW-NE direction from the city of Cadiz on the Atlantic Ocean to the Balearic Islands in the Mediterranean
Conodonts from Calasparra belong to Pseudofurnishius murcianus van den Boogaard, the most common Middle Triassic species in the Iberian Peninsula
This is the first time that such an early age for Pseudofurnishius murcianus has been evidenced in the Iberian Peninsula
Summary
Extending S-SE of the Iberian Massif and Guadalquivir Valley, the External Zone of the Betic Cordillera is divided in the large Prebetic and Subbetic tectono-stratigraphic domains (Fig. 1), that comprise thrust-sheets of Triassic to Miocene mainly marine successions (Pérez-Lopez and Pérez-Varela, 2007). Muschelkalk deposits consist of carbonate successions of dolomites, limestones and marly limestones, increasingly dominated by marls towards the upper part. This unit was defined as Cehegín Formation (Pérez-Valera and Pérez-López, 2008) and can be correlated with the Majanillos Formation (Pérez-López, 1991) that was defined in the central part of the Betic Cordillera. A detrital-evaporitic unit with shale, sandstone, gypsum, and occasional basic subvolcanic rocks represents a characteristic Keuper facies that belong to the Jaén Keuper Group (Pérez-López 1991).
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