Publication: Una nueva sección fosilífera de la Formación Sueve (Ordovícico Medio) al suroeste del Túnel Ordovícico del Fabar (Ribadesella,Asturias, NO de España)
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Publication Date
2022
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Sociedad Geológica de España
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Abstract
Se presenta una nueva sección bioestratigrafica de la parte basal de la Formación Sueve. La nueva sección se suma a las nuevesecciones descritas en estudios previos, relativos al sector septentrional del manto de Laviana. Los horizontes fosilíferos muestreados seintegran en la Biozona del graptolito Didymograptus murchisoni, indicativo de una edad Oretaniense tardío o Darriwiliense tardío no terminal según las respectivas escalas regional y global. Entre los resultados paleontológicos destaca el hallazgo de algunos fósiles raros o desconocidos en la Fm. Sueve. El graptolito Pseudoclimacograptus cf. scharenbergi (Lapworth) se cita por vez primera en el SO de Europa a través de un ejemplar conservado tridimensionalmente; el rostroconcha Ribeiria apusoides Schubert y Waagen se identifica por segunda vez en el Ordovícico de España (tras un primer registro centroibérico en Almadén); y el trilobites Crozonaspis morenensis Hammann confirma su presencia en el Oretaniense superior de la Fm. Sueve con un material más abundante y mejor conservado. Finalmente, el descubrimiento de un trilobites rafiofórido en el afloramiento estudiado abre la posibilidad de encontrar nuevos ejemplares de estos rarísimos trilobites a escala del Ordovícico ibérico.
A new biostratigraphic section for the lower part of the Sueve Formation (Cantabrian Zone, NW Spain) is here presented. This section adds to the nine previously reported ones in the northern sector of the Laviana nappe. The fossiliferous horizons sampled in this section belongs to the Didymograptus murchisoni graptolite Zone, indicative of a late Oretanian or of a non-terminal late Darriwilian age according respectively to the regional and global chronostratigraphic scales. Of special interest is the occurrence of some fossils rare or sofar unknown in the Sueve Fm. The graptolite Pseudoclimacograptus cf.scharenbergi (Lapworth) is recorded for the first time in SW Europe through a three-dimensionally preserved specimen; the rostroconch mollusk Ribeiria apusoides Schubert and Waagen is identified for the second time in the Ordovician of Spain (after its first record in the Central Iberian Zone near Almadén); and the late Oretanian trilobite Crozonaspis morenensis Hammann confirms its record in the Sueve Fm. with a more abundant and better preserved material. Finally, the discovery of a raphiophorid trilobite in a surface outcrop opens the possibility of finding new specimens of these extremely rare trilobites in the Ordovician of Spain.
A new biostratigraphic section for the lower part of the Sueve Formation (Cantabrian Zone, NW Spain) is here presented. This section adds to the nine previously reported ones in the northern sector of the Laviana nappe. The fossiliferous horizons sampled in this section belongs to the Didymograptus murchisoni graptolite Zone, indicative of a late Oretanian or of a non-terminal late Darriwilian age according respectively to the regional and global chronostratigraphic scales. Of special interest is the occurrence of some fossils rare or sofar unknown in the Sueve Fm. The graptolite Pseudoclimacograptus cf.scharenbergi (Lapworth) is recorded for the first time in SW Europe through a three-dimensionally preserved specimen; the rostroconch mollusk Ribeiria apusoides Schubert and Waagen is identified for the second time in the Ordovician of Spain (after its first record in the Central Iberian Zone near Almadén); and the late Oretanian trilobite Crozonaspis morenensis Hammann confirms its record in the Sueve Fm. with a more abundant and better preserved material. Finally, the discovery of a raphiophorid trilobite in a surface outcrop opens the possibility of finding new specimens of these extremely rare trilobites in the Ordovician of Spain.