New insights about the Upper Jurassic – Lower Cretaceous sedimentary successions from Asturias (NW Iberian Peninsula)

  • Beatriz González-Fernández Universidad de Oviedo
  • E. Menéndez-Casares Departamento de Explotación y Prospección de Minas, Universidad de Oviedo. C/ Independencia, 13, 33004 Oviedo, Spain.
  • V. Vicedo Museu de Ciències Naturals de Barcelona (Paleontologia). Passeig Picasso s/n. 08003 Barcelona, Spain.
  • C. Aramburu Departamento de Geología, Universidad de Oviedo. C/ Jesús Arias de Velasco, s/n, 33005 Oviedo, Spain.
  • E. Caus Departament de Geologia (Paleontologia), Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain.
Keywords: Late Jurassic, Early Cretaceous, Larger Foraminifera, NW Spain

Abstract

Detailed mapping of the Jurassic to pre-Albian deposits of central and eastern Asturias (NW of the Iberian Peninsula) has enabled several Upper Jurassic and Lower Cretaceous outcrops, previously assigned to other ages, to be identified. Where possible, these outcrops have been correlated with the well-known sequences outcropping on the Asturian coast. A new Jurassic unit, the Miyares Formation, has been defined, which consists of a Lower conglomerate Unit, a Middle Unit composed mainly of oolitic limestones and an Upper Unit comprising bioclastic and marly limestones with a rich fauna of larger foraminifera. The Lower Unit is interpreted as having been deposited in a fan delta, the Middle Unit represents a shallow marine high-energy environment, and the Upper Unit was deposited on a restricted shallow marine platform. The shallow-water foraminiferal assemblage from the Upper Unit is attributed to the Tithonian and the oldest Cretaceous rocks are Barremian; there is therefore a stratigraphic gap recorded in the study area, which might correspond to the latest Jurassic to Early Cretaceous p. p. timespan.

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Author Biography

Beatriz González-Fernández, Universidad de Oviedo
Departamento de Explotación y Prospección de Minas, . C/ Independencia, 13, 33004 Oviedo, Spain

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Published
2014-05-21
How to Cite
González-Fernández B., Menéndez-Casares E., Vicedo V., Aramburu C. y Caus E. (2014). New insights about the Upper Jurassic – Lower Cretaceous sedimentary successions from Asturias (NW Iberian Peninsula). Journal of Iberian Geology, 40(3), 409-430. https://doi.org/10.5209/rev_JIGE.2014.v40.n3.43078
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