Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain
Document title: Impact of storms on Pliocene benthic foraminiferal assemblages of southwestern Spain
Journal: Ameghiniana
Database: PERIÓDICA
System number: 000322394
ISSN: 0002-7014
Authors: 1
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2

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Institutions: 1Universidad de Huelva, Departamento de Geodinámica y Paleontología, Huelva. España
2Universidad de Salamanca, Departamento de Geología, Salamanca. España
3Universidad de Sevilla, Departamento de Estadística e Investigación Operativa, Sevilla. España
4Universidad de Guadalajara, Departamento de Botánica y Zoología, Guadalajara, Jalisco. México
5Universidad de Huelva, Departamento de Geologìa, Huelva. España
Year:
Volumen: 46
Number: 2
Pages: 345-360
Country: Argentina
Language: Inglés
Document type: Artículo
Approach: Analítico, descriptivo
English abstract 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
Disciplines: Biología
Keyword: Invertebrados,
Paleontología,
Foraminifera,
Bentos,
España,
Tormentas,
Plioceno
Keyword: Biology,
Invertebrates,
Paleontology,
Foraminifera,
Pliocene,
Storms,
Spain,
Benthos
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