Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain


  • María L. González-Regalado
  • Francisco Ruiz Universidad de Huelva, España
  • Manuel Abad
  • Jorge Civis
  • José A. González Delgado
  • Juan M. Muñoz
  • Edith X. M. García
  • José G. Pendón
  • Antonio Toscano


Lithostratigraphical and faunal analyses of five Pliocene sections located in the southwestern Guadalquivir Basin (S Spain) permit reveal three main facies, which represent shallow marine fairweather conditions (FA-1), storm events (FA-2) and littoral/fluvial environments (FA-3). The vertical disposition of these facies indicates a regressive sequence. The statistical study of foraminiferal populations revealed five infralittoral and circalittoral assemblages. Vertical and horizontal variations among these assemblages, the P/B ratio and four diversity indices, together with the mollusc distributions, suggest the presence of a shallow marine palaeoenvironment in this area in the Lower Pliocene, with an increasing depth towards the southwestern. The main effects from storm events on the foraminiferal faunas are a slightly decrease of individuals and species, and a marked drop in the P/B ratio. The post-storm conditions are characterized by: a) a higher number of individuals; b) a progressive increase in the P/B ratio and c) small increases in the remaining indices.

Author Biography

Francisco Ruiz, Universidad de Huelva, España

Profesor Titular de Universidad, Área de Paleontología, Departamento de Geodinámica y Paleontología



How to Cite

González-Regalado, M. L., Ruiz, F., Abad, M., Civis, J., González Delgado, J. A., Muñoz, J. M., García, E. X. M., Pendón, J. G., & Toscano, A. (2009). Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain. Ameghiniana, 46(2), 345-360. Retrieved from




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