A new fossiliferous section of the Sueve Formation (Middle Ordovician) SE of El Fabar Ordovician Tunnel (Ribadesella, Asturias, NW Spain)

Authors

  • Enrique Bernárdez Instituto Superior de Correlación Geológica, San Miguel de Tucumán, Argentina.
  • Juan Carlos Gutiérrez-Marco Instituto de Geociencias (CSIC, UCM) y Dpto. GEODESPAL, Universidad Complutense de Madrid, España.
  • Isabel Rábano Instituto Geológico y Minero de España (IGME-CSIC), Madrid, España

DOI:

https://doi.org/10.55407/geogaceta98376

Keywords:

Darriwilian, biostratigraphy, Cantabrian Zone, NW Spain, Ordovician

Abstract

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.

References

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Published

2022-12-11

How to Cite

Bernárdez, E., Gutiérrez-Marco, J. C., & Rábano, I. (2022). A new fossiliferous section of the Sueve Formation (Middle Ordovician) SE of El Fabar Ordovician Tunnel (Ribadesella, Asturias, NW Spain). GEOGACETA, 72, 59–62. https://doi.org/10.55407/geogaceta98376

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Vol. 72 (2022): July_December

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