First Frasnian conodonts in the Malaguide Complex of Granada (Betic Cordillera)
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Dpto. Estratigrafía y Paleontología. Universidad de Granada Avda. Severo Ochoa s/n. 18071 Granada, Spain. email@example.com
A thin calcareous bed found in the highest tectonic unit of the Malaguide Complex near Granada has provided a very rich conodont fauna (808 elements per kg of sample) formed by Ancyrodella binodosa, Ancyrodella pristina, Icriodus difficilis, Icriodus symmetricus, Polygnathus decorosus, Polygnathus dengleri, and Polygnathus dubius, among other species. This association corresponds to a polygnathid biofacies and it allows its accurate dating as belonging to the MN1 and MN2 zones (earliest Frasnian), whose presence has been found for the first time in the Malaguide Complex. Furthermore, this is the first biostratigraphic age of Frasnian beds in the central sector of the Betic Cordillera. The horizon is interbedded between pelites including sandstone, volcaniclastic and other thin calcareous beds, dated as Emsian and Famennian, which underlie the Falcoña Fm. (lower Carboniferous). This pre-Falcoña succession is located within a different tectonic unit to that bearing the Santi Petri Fm. Both successions are equivalent, but the former was deposited in shallower and more proximal sedimentary environments than the latter, which is the most typical and widest outcropping Devonian Malaguide succession.
Key words: conodonts, polygnathid biofacies, MN1 and MN2 zones, pre-Falcoña succession.
How to cite: Cabrera-Porras, Á., Rodríguez-Cañero, R. & Martín-Algarra, A. 2019. Primeros conodontos del Frasniense en el Complejo Maláguide de Granada (Cordillera Bética). [First Frasnian conodonts in the Malaguide Complex of Granada (Betic Cordillera)]. Spanish Journal of Palaeontology, 34 (2), 163-186.
Received 26 November 2018, Accepted 13 May 2019, Published 31 December 2019