Witnesses of the early Pliocene sea-level rise in the Manilva Basin (Málaga, S Spain)

Autores/as

  • Julio Aguirre Universidad de Valencia
  • Rosa Domènech Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona
  • Jordi Martinell Departament d’Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona
  • Eduardo Mayoral Departamento de Ciencias de la Tierra, Universidad de Huelva
  • Ana Santos Departamento de Ciencias de la Tierra, Universidad de Huelva
  • José Noel Pérez-Asensio GRC Geociències Marines, Departament de Dinàmica de la Terra i de l’Oceà, Universitat de Barcelona

DOI:

https://doi.org/10.7203/sjp.32.1.17029

Palabras clave:

Bioerosion, Entobia ichnofacies, palaeogeography, early Pliocene transgression, Sierra de Utrera

Resumen

The Sierra de la Utrera, a relief in the Manilva Basin (Málaga, SW Spain), shows bored surfaces at different heights above present-day sea level, from 96 m to 287 m. Borings occur in the eastern, central, and western parts of the Canuto de la Utrera, a prominent gorge in the central southern part of the relief excavated in Mesozoic limestones, as well as on the western end of the Canuto Chico, a smaller canyon in the northern part. Pliocene marine deposits fossilized the bored surfaces. Bored boulders of the substrate are embedded in the Pliocene sediments. The traces Gastrochaenolites ispp., Entobia ispp., Caulostrepsis ispp., Circolites kotoucensis, and Ericichnus asgaardi have been identified. Among these, Caulostrepsis is found only in the reworked blocks. This ichnoassemblage, attributed to the archetypical Entobia Ichnofacies of rocky shores, represents boring activity in high-energy, very-shallow-water settings, close to the sea level, and with a virtually null sedimentation rate. The vertical distribution of bored surfaces attests to a progressive sea-level rise. The onlap of the Pliocene deposits on the substrate is consistent with the deepening trend. Planktonic foraminiferal assemblages collected from the sediment adjacent to the Sierra de la Utrera demonstrate that boring activity spanned, at most, 1 Ma during the early Pliocene, Zanclean (biozones MPl 1 and MPl 2), ranging from 5.33 to 4.36 Ma.

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Publicado

2020-04-09

Cómo citar

Aguirre, J., Domènech, R., Martinell, J., Mayoral, E., Santos, A., & Pérez-Asensio, J. N. (2020). Witnesses of the early Pliocene sea-level rise in the Manilva Basin (Málaga, S Spain). Spanish Journal of Palaeontology, 32(1), 35–51. https://doi.org/10.7203/sjp.32.1.17029
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